Kaitlynn J. Wade, Michael J. Wilberg, Burton Shank, Daniel W. Cullen
Objective
The commercial importance of Jonah crabs Cancer borealis and Atlantic rock crabs Cancer irroratus has increased over the past few decades, but both species are still data limited. Objectives were to determine the spatial distributions of Jonah and Atlantic rock crabs over time and to estimate associations with environmental variables.
Methods
Data were from the Northeast Fisheries Science Center offshore spring bottom trawl surveys during 1968–2021 on Georges Bank and in the Mid-Atlantic Bight. Environmental preferences for temperature (°C), depth (m), and grain size (ϕ) were estimated using generalized additive models, and the habitat usage between the two crabs were compared using empirical cumulative distribution functions.
Result
The spatial distributions of Jonah and Atlantic rock crabs changed over time. Grain size was the most important environmental variable for predicting presence of Jonah crabs, and depth was the most important variable for explaining presence of Atlantic rock crabs. The generalized additive model with the best cross validation and the lowest Akaike information criterion for both crabs included all environmental, spatial, and temporal variables.
Conclusion
Jonah and Atlantic rock crabs have different spatial distributions and environmental preferences. Jonah crabs preferred slightly warmer temperatures, deeper depths, and muddier sediments than Atlantic rock crabs. As the commercial importance for Jonah crabs increases, information on their population distribution and habitat usage is important for effective management.
{"title":"Spatial distributions of Jonah and Atlantic rock crabs in the Georges Bank and Mid-Atlantic Bight regions during 1968–2021","authors":"Kaitlynn J. Wade, Michael J. Wilberg, Burton Shank, Daniel W. Cullen","doi":"10.1002/mcf2.10315","DOIUrl":"https://doi.org/10.1002/mcf2.10315","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objective</h3>\u0000 \u0000 <p>The commercial importance of Jonah crabs <i>Cancer borealis</i> and Atlantic rock crabs <i>Cancer irroratus</i> has increased over the past few decades, but both species are still data limited. Objectives were to determine the spatial distributions of Jonah and Atlantic rock crabs over time and to estimate associations with environmental variables.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>Data were from the Northeast Fisheries Science Center offshore spring bottom trawl surveys during 1968–2021 on Georges Bank and in the Mid-Atlantic Bight. Environmental preferences for temperature (°C), depth (m), and grain size (ϕ) were estimated using generalized additive models, and the habitat usage between the two crabs were compared using empirical cumulative distribution functions.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Result</h3>\u0000 \u0000 <p>The spatial distributions of Jonah and Atlantic rock crabs changed over time. Grain size was the most important environmental variable for predicting presence of Jonah crabs, and depth was the most important variable for explaining presence of Atlantic rock crabs. The generalized additive model with the best cross validation and the lowest Akaike information criterion for both crabs included all environmental, spatial, and temporal variables.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusion</h3>\u0000 \u0000 <p>Jonah and Atlantic rock crabs have different spatial distributions and environmental preferences. Jonah crabs preferred slightly warmer temperatures, deeper depths, and muddier sediments than Atlantic rock crabs. As the commercial importance for Jonah crabs increases, information on their population distribution and habitat usage is important for effective management.</p>\u0000 </section>\u0000 </div>","PeriodicalId":51257,"journal":{"name":"Marine and Coastal Fisheries","volume":"16 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mcf2.10315","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142525510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The objectives of this study were to investigate potential shift in the phenology of spawning for the Hudson River American Shad Alosa sapidissima and to identify factors contributing to the decline of the Hudson River shad population.
Methods
This study utilized American Shad eggs collected from the Long River Ichthyoplankton Survey. Logistic models were employed to estimate spawning phenology metrics, including the onset, peak, cessation, and duration of the spawning season. Additionally, we investigated the effects of biotic and abiotic variables on spawning timing.
Result
This study suggests that temporal changes in the spawning onset exhibited high variation and were not significant. However, a significantly delayed spawning peak and cessation, along with an extended spawning season, were observed. Additionally, the findings of this study revealed a correlation between the timing of spawning onset and water temperature, indicating that a 1°C increase in water temperature was associated with a 3.66-day earlier initiation of spawning. Smaller female spawner size was associated with delayed peak and cessation of the spawning season. With a 1-cm decrease in the average female spawner size, the peak of the spawning season was delayed by 1.79 days and the cessation of the spawning season was delayed by 2.87 days.
Conclusion
The findings indicate that water temperature may be a crucial trigger for initiating spawning in Hudson River American Shad, with higher water temperatures associated with earlier spawning onset. Moreover, the findings indicate that the timing of spawning peaks and cessations has been progressively delayed over time, and this is linked to the size of female spawners.
{"title":"Shifting spawning phenology in Hudson River American Shad","authors":"Hsiao-Yun Chang, Yong Chen","doi":"10.1002/mcf2.10312","DOIUrl":"https://doi.org/10.1002/mcf2.10312","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objective</h3>\u0000 \u0000 <p>The objectives of this study were to investigate potential shift in the phenology of spawning for the Hudson River American Shad <i>Alosa sapidissima</i> and to identify factors contributing to the decline of the Hudson River shad population.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>This study utilized American Shad eggs collected from the Long River Ichthyoplankton Survey. Logistic models were employed to estimate spawning phenology metrics, including the onset, peak, cessation, and duration of the spawning season. Additionally, we investigated the effects of biotic and abiotic variables on spawning timing.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Result</h3>\u0000 \u0000 <p>This study suggests that temporal changes in the spawning onset exhibited high variation and were not significant. However, a significantly delayed spawning peak and cessation, along with an extended spawning season, were observed. Additionally, the findings of this study revealed a correlation between the timing of spawning onset and water temperature, indicating that a 1°C increase in water temperature was associated with a 3.66-day earlier initiation of spawning. Smaller female spawner size was associated with delayed peak and cessation of the spawning season. With a 1-cm decrease in the average female spawner size, the peak of the spawning season was delayed by 1.79 days and the cessation of the spawning season was delayed by 2.87 days.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusion</h3>\u0000 \u0000 <p>The findings indicate that water temperature may be a crucial trigger for initiating spawning in Hudson River American Shad, with higher water temperatures associated with earlier spawning onset. Moreover, the findings indicate that the timing of spawning peaks and cessations has been progressively delayed over time, and this is linked to the size of female spawners.</p>\u0000 </section>\u0000 </div>","PeriodicalId":51257,"journal":{"name":"Marine and Coastal Fisheries","volume":"16 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mcf2.10312","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142525239","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Micah J. Dean, William S. Hoffman, Benjamin I. Gahagan, Gary A. Nelson, Michael P. Armstrong
Objective
The Striped Bass Morone saxatilis is one of the most sought-after recreational fish species along the US Atlantic coast. Regulations and a strong conservation ethic among anglers make Striped Bass among the most frequently released coastal marine fishes. A recent rule requires anglers to use circle hooks when targeting Striped Bass with natural baits, yet the conservation benefit of this action remains unclear.
Methods
We used acoustic telemetry to monitor the fate of Striped Bass that were recreationally caught with baited hooks (n = 349) and to estimate the influence of various biological (fish size), fishery (fight time, handling time, hook location, bait type, and hook type), and environmental (water temperature and air temperature) variables on postrelease survival.
Result
A semi-quantitative score of fish release condition was the single best predictor of mortality. A broader dataset that included untagged fish (n = 716) was used to identify the best predictors of fish release condition, which included hook location and handling time.
Conclusion
Contrary to expectations, the circle hooks used in this study did not result in lower release mortality than conventional J-hooks.
{"title":"Evaluating the conservation benefit of circle hooks for the Atlantic Striped Bass recreational fishery","authors":"Micah J. Dean, William S. Hoffman, Benjamin I. Gahagan, Gary A. Nelson, Michael P. Armstrong","doi":"10.1002/mcf2.10308","DOIUrl":"https://doi.org/10.1002/mcf2.10308","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objective</h3>\u0000 \u0000 <p>The Striped Bass <i>Morone saxatilis</i> is one of the most sought-after recreational fish species along the US Atlantic coast. Regulations and a strong conservation ethic among anglers make Striped Bass among the most frequently released coastal marine fishes. A recent rule requires anglers to use circle hooks when targeting Striped Bass with natural baits, yet the conservation benefit of this action remains unclear.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>We used acoustic telemetry to monitor the fate of Striped Bass that were recreationally caught with baited hooks (<i>n</i> = 349) and to estimate the influence of various biological (fish size), fishery (fight time, handling time, hook location, bait type, and hook type), and environmental (water temperature and air temperature) variables on postrelease survival.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Result</h3>\u0000 \u0000 <p>A semi-quantitative score of fish release condition was the single best predictor of mortality. A broader dataset that included untagged fish (<i>n</i> = 716) was used to identify the best predictors of fish release condition, which included hook location and handling time.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusion</h3>\u0000 \u0000 <p>Contrary to expectations, the circle hooks used in this study did not result in lower release mortality than conventional J-hooks.</p>\u0000 </section>\u0000 </div>","PeriodicalId":51257,"journal":{"name":"Marine and Coastal Fisheries","volume":"16 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mcf2.10308","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142276601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Wenzhou Wu, Peng Zhang, Qi Wang, Lu Kang, Fenzhen Su
Objective
Recently, the South China Sea has been facing a crisis of depleted fishery resources, primarily due to the impacts of illegal, unreported, and unregulated fishing activities, as well as overfishing. Accurately understanding the fishing activity intensity in the South China Sea holds significant implications for the sustainable management of fisheries resources.
Methods
Leveraging the automatic identification system trajectory data from 2018, this paper employs spatial statistical methods and fishing effort indicators to comparatively analyze the spatial variations in fishing intensity between Chinese and Vietnamese fishing vessels.
Result
The results of this study show that (1) in 2018, the total fishing effort of Chinese fishing vessels in the South China Sea was 7.65 times that of Vietnamese vessels, but during China's South China Sea fishing moratorium, the fishing effort exerted by Vietnamese vessels surpassed that of China and (2) the top 10 ports in China and Vietnam support approximately 30% and 55.13% of their respective fishing intensities in the South China Sea.
Conclusion
The study highlights significant variations in fishing intensity between Chinese and Vietnamese vessels and the substantial support provided by major ports. These findings offer valuable insights for fisheries resource monitoring and maritime spatial planning, contributing to the sustainable management of the South China Sea's fisheries resources.
{"title":"Analysis of fishing intensity in the South China Sea based on automatic identification system data: A comparison between China and Vietnam","authors":"Wenzhou Wu, Peng Zhang, Qi Wang, Lu Kang, Fenzhen Su","doi":"10.1002/mcf2.10309","DOIUrl":"https://doi.org/10.1002/mcf2.10309","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objective</h3>\u0000 \u0000 <p>Recently, the South China Sea has been facing a crisis of depleted fishery resources, primarily due to the impacts of illegal, unreported, and unregulated fishing activities, as well as overfishing. Accurately understanding the fishing activity intensity in the South China Sea holds significant implications for the sustainable management of fisheries resources.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>Leveraging the automatic identification system trajectory data from 2018, this paper employs spatial statistical methods and fishing effort indicators to comparatively analyze the spatial variations in fishing intensity between Chinese and Vietnamese fishing vessels.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Result</h3>\u0000 \u0000 <p>The results of this study show that (1) in 2018, the total fishing effort of Chinese fishing vessels in the South China Sea was 7.65 times that of Vietnamese vessels, but during China's South China Sea fishing moratorium, the fishing effort exerted by Vietnamese vessels surpassed that of China and (2) the top 10 ports in China and Vietnam support approximately 30% and 55.13% of their respective fishing intensities in the South China Sea.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusion</h3>\u0000 \u0000 <p>The study highlights significant variations in fishing intensity between Chinese and Vietnamese vessels and the substantial support provided by major ports. These findings offer valuable insights for fisheries resource monitoring and maritime spatial planning, contributing to the sustainable management of the South China Sea's fisheries resources.</p>\u0000 </section>\u0000 </div>","PeriodicalId":51257,"journal":{"name":"Marine and Coastal Fisheries","volume":"16 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mcf2.10309","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142160153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Halie B. O'Farrell, Elizabeth A. Babcock, Kevin J. McCarthy
Objective
The Gulf of Mexico (GOM) reef bottom longline fishery typically not only targets groupers and snappers but also interacts with 27 species of sharks, which are primarily discarded as bycatch. Slow growth, late maturity, and low fecundity in a landscape of increasing fishing pressure make sharks comparatively more susceptible to overfishing and endangered status than other fishes. The purpose of this study was to determine which gear and/or environmental variables best predict the shark catch per set for commonly caught shark species in the GOM reef bottom longline fishery.
Methods
We considered 12 commonly caught shark species that vary from the abundant Atlantic Sharpnose Shark Rhizoprionodon terraenovae to the critically endangered Scalloped Hammerhead Sphyrna lewini. Catch per set, effort, gear, and environmental data were taken from the National Oceanic and Atmospheric Administration National Marine Fisheries Service observer dataset for the GOM reef bottom longline fishery (2009–2017) and were used to fit generalized additive models. The Bayesian information criterion and 10-fold cross-validation were used to select the best set of variables that predicted catch per set to determine gear configurations, fisher activities, and environmental conditions contributing to higher shark catch per unit effort. We modeled each species individually, all species combined, and species grouped by similar ecology.
Result
Gear and fishing method variables were consistently included in the best predictive models across species and were the only potential basis for a single strategy that could decrease bycatch across all 12 species. Patterns of environmental variables were only consistent across species with similar ecology and habitat.
Conclusion
Sharks as a group should not be lumped together, as the effects of mitigation measures become confounded and directly managing trade-offs between species when minimizing bycatch becomes impossible. Focusing on gear rather than environmental variables is the best apparent option to potentially reduce shark catch per set across commonly caught species while minimizing trade-offs.
{"title":"Bycatch mitigation for commonly caught shark species in the Gulf of Mexico reef bottom longline fishery","authors":"Halie B. O'Farrell, Elizabeth A. Babcock, Kevin J. McCarthy","doi":"10.1002/mcf2.10310","DOIUrl":"https://doi.org/10.1002/mcf2.10310","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objective</h3>\u0000 \u0000 <p>The Gulf of Mexico (GOM) reef bottom longline fishery typically not only targets groupers and snappers but also interacts with 27 species of sharks, which are primarily discarded as bycatch. Slow growth, late maturity, and low fecundity in a landscape of increasing fishing pressure make sharks comparatively more susceptible to overfishing and endangered status than other fishes. The purpose of this study was to determine which gear and/or environmental variables best predict the shark catch per set for commonly caught shark species in the GOM reef bottom longline fishery.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>We considered 12 commonly caught shark species that vary from the abundant Atlantic Sharpnose Shark <i>Rhizoprionodon terraenovae</i> to the critically endangered Scalloped Hammerhead <i>Sphyrna lewini</i>. Catch per set, effort, gear, and environmental data were taken from the National Oceanic and Atmospheric Administration National Marine Fisheries Service observer dataset for the GOM reef bottom longline fishery (2009–2017) and were used to fit generalized additive models. The Bayesian information criterion and 10-fold cross-validation were used to select the best set of variables that predicted catch per set to determine gear configurations, fisher activities, and environmental conditions contributing to higher shark catch per unit effort. We modeled each species individually, all species combined, and species grouped by similar ecology.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Result</h3>\u0000 \u0000 <p>Gear and fishing method variables were consistently included in the best predictive models across species and were the only potential basis for a single strategy that could decrease bycatch across all 12 species. Patterns of environmental variables were only consistent across species with similar ecology and habitat.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusion</h3>\u0000 \u0000 <p>Sharks as a group should not be lumped together, as the effects of mitigation measures become confounded and directly managing trade-offs between species when minimizing bycatch becomes impossible. Focusing on gear rather than environmental variables is the best apparent option to potentially reduce shark catch per set across commonly caught species while minimizing trade-offs.</p>\u0000 </section>\u0000 </div>","PeriodicalId":51257,"journal":{"name":"Marine and Coastal Fisheries","volume":"16 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mcf2.10310","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142158596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Serhat Engin, Mustafa Tolga Tolon, Deniz Günay, Dilek Emiroğlu
Objective
The aim of this study was to determine the reproductive cycle and spawning frequency of the sea cucumber Holothuria tubulosa in the northeastern Aegean Sea.
Methods
The study covered a period of 12 months, beginning in October 2018 and concluding in September 2019. During this period, sea cucumber samples were collected monthly. Macroscopic and histological examinations of gonadal tubules were conducted to provide credible information for fishery management and aquaculture.
Result
The sex ratio of the sampled population was 1:1.3, with 95 males and 130 females. The drained body weights at 50% maturity were 70.90 g for females and 70.80 g for males. The total length at 50% maturity was estimated at 18.58 cm for females and 18.05 cm for males. Gonad maturation was initiated in March and progressed to spawning stages between July and August. From September to February, the gonads were in postspawning and recovery stages. A strong linear correlation was determined between the gonad index and the seawater temperature in the area.
Conclusion
The information provided is expected to improve stock management, enforce fishery regulations, and support controlled breeding programs. These measures aim to preserve the natural populations of Holothuria tubulosa and guarantee the long-term viability of the species in the wild.
{"title":"Reproductive cycle of the temperate sea cucumber Holothuria tubulosa in the northeastern Aegean Sea","authors":"Serhat Engin, Mustafa Tolga Tolon, Deniz Günay, Dilek Emiroğlu","doi":"10.1002/mcf2.10307","DOIUrl":"https://doi.org/10.1002/mcf2.10307","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objective</h3>\u0000 \u0000 <p>The aim of this study was to determine the reproductive cycle and spawning frequency of the sea cucumber <i>Holothuria tubulosa</i> in the northeastern Aegean Sea.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>The study covered a period of 12 months, beginning in October 2018 and concluding in September 2019. During this period, sea cucumber samples were collected monthly. Macroscopic and histological examinations of gonadal tubules were conducted to provide credible information for fishery management and aquaculture.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Result</h3>\u0000 \u0000 <p>The sex ratio of the sampled population was 1:1.3, with 95 males and 130 females. The drained body weights at 50% maturity were 70.90 g for females and 70.80 g for males. The total length at 50% maturity was estimated at 18.58 cm for females and 18.05 cm for males. Gonad maturation was initiated in March and progressed to spawning stages between July and August. From September to February, the gonads were in postspawning and recovery stages. A strong linear correlation was determined between the gonad index and the seawater temperature in the area.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusion</h3>\u0000 \u0000 <p>The information provided is expected to improve stock management, enforce fishery regulations, and support controlled breeding programs. These measures aim to preserve the natural populations of <i>Holothuria tubulosa</i> and guarantee the long-term viability of the species in the wild.</p>\u0000 </section>\u0000 </div>","PeriodicalId":51257,"journal":{"name":"Marine and Coastal Fisheries","volume":"16 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mcf2.10307","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142007128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
David R. Bryan, Noëlle Yochum, Katherine C. Wilson
Objective
Although the bycatch of Pacific salmon Oncorhynchus spp. is relatively low in the Walleye Pollock Gadus chalcogrammus and Pacific Hake Merluccius productus pelagic trawl fisheries, different efforts are employed to reduce it, including the use of bycatch reduction devices (BRDs) that retain the targeted species and provide Pacific salmon a pathway to escape. The objective of this study was to evaluate Pacific salmon behavior inside a pelagic trawl and to determine what conditions favor the probability of a salmon moving forward in the trawl and increase their probability of escapement.
Methods
We placed a video camera at the entrance of the cod end and recorded the behaviors of Pacific salmon as they passed by. The timing of the forward movement Pacific salmon in relation to fishing operations and the correlations between forward movement of Pacific salmon and vessel speed over ground, water flow rate, ambient light levels, and abundance of Walleye Pollock were examined.
Result
Of the 2969 Pacific salmon observed, 71% were moving aft toward the cod end, 24% were observed moving forward, and 5% were moving aft then forward or forward then aft. The percentage (77%) and rate (0.86 fish per minute) of forward-moving Pacific salmon was greatest once the trawl doors were back on the vessel and water flow within the trawl was reduced. Speed over ground and Walleye Pollock abundance were negatively correlated with forward movement of Pacific salmon. Only 6.5% of Pacific salmon that were in the cod end when fishing ended were able to move forward before the cod end was on the vessel.
Conclusion
Pacific salmon can move forward in the trawl throughout fishing operations and haulback, but the percentage increases as the speed over ground and water flow inside the trawl is reduced. The low percentage of Pacific salmon that move forward after fishing has ended suggests that Pacific salmon escapement at the end of a tow is relatively low and suggests that BRD design should focus on stimulating escapement at the first BRD encounter.
{"title":"Evaluating Pacific salmon swimming behavior in the aft end of a pelagic trawl to inform bycatch reduction device design and use","authors":"David R. Bryan, Noëlle Yochum, Katherine C. Wilson","doi":"10.1002/mcf2.10306","DOIUrl":"https://doi.org/10.1002/mcf2.10306","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objective</h3>\u0000 \u0000 <p>Although the bycatch of Pacific salmon <i>Oncorhynchus</i> spp. is relatively low in the Walleye Pollock <i>Gadus chalcogrammus</i> and Pacific Hake <i>Merluccius productus</i> pelagic trawl fisheries, different efforts are employed to reduce it, including the use of bycatch reduction devices (BRDs) that retain the targeted species and provide Pacific salmon a pathway to escape. The objective of this study was to evaluate Pacific salmon behavior inside a pelagic trawl and to determine what conditions favor the probability of a salmon moving forward in the trawl and increase their probability of escapement.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>We placed a video camera at the entrance of the cod end and recorded the behaviors of Pacific salmon as they passed by. The timing of the forward movement Pacific salmon in relation to fishing operations and the correlations between forward movement of Pacific salmon and vessel speed over ground, water flow rate, ambient light levels, and abundance of Walleye Pollock were examined.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Result</h3>\u0000 \u0000 <p>Of the 2969 Pacific salmon observed, 71% were moving aft toward the cod end, 24% were observed moving forward, and 5% were moving aft then forward or forward then aft. The percentage (77%) and rate (0.86 fish per minute) of forward-moving Pacific salmon was greatest once the trawl doors were back on the vessel and water flow within the trawl was reduced. Speed over ground and Walleye Pollock abundance were negatively correlated with forward movement of Pacific salmon. Only 6.5% of Pacific salmon that were in the cod end when fishing ended were able to move forward before the cod end was on the vessel.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusion</h3>\u0000 \u0000 <p>Pacific salmon can move forward in the trawl throughout fishing operations and haulback, but the percentage increases as the speed over ground and water flow inside the trawl is reduced. The low percentage of Pacific salmon that move forward after fishing has ended suggests that Pacific salmon escapement at the end of a tow is relatively low and suggests that BRD design should focus on stimulating escapement at the first BRD encounter.</p>\u0000 </section>\u0000 </div>","PeriodicalId":51257,"journal":{"name":"Marine and Coastal Fisheries","volume":"16 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mcf2.10306","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142007159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Megan K. La Peyre, Shaye Sable, Danielle A. Marshall, Elise Irwin, Chad Hanson
Objective
Increasing reliance on numerical simulation models to help inform management and restoration choices benefits from careful consideration of critical early steps in model development. Along the northern coast of the Gulf of Mexico, the eastern oyster Crassostrea virginica fulfills important ecological and economic roles. Using the eastern oyster as an example, we draw on several recent frameworks outlining best practices for model development and application for restoration, conservation, and management.
Methods
We identify priority model questions, outline a conceptual ecological model (CEM) to guide numerical model development, and use this framework to identify uncertainties and research needs.
Result
The CEM uses a nested design, identifying explicit vital rates, processes, attributes, and outcomes for the species (oysters), population, and metapopulation (i.e., network of populations) levels in response to drivers of species, population, and metapopulation changes and changing environmental factors. Most management actions related to oyster restoration and harvest affect population attributes directly, but many coastal management actions and changes (i.e., climate change and coastal and water resource engineering) impact environmental factors that alter vital rates and attributes of oysters, populations, and metapopulations.
Conclusion
Investment in studies targeting individual oyster- and population-level multi-stressor responses (filtration, respiration, growth, and reproduction) and improving hydrodynamic and environmental models targeting drivers that influence metapopulation vital rates and attributes (i.e., connectivity and substrate persistence) would contribute to reducing uncertainties. Development of numerical models covering the entire oyster life cycle and connectivity of populations using hydrodynamic models of current and predicted conditions to provide key abiotic and biotic factors influencing larval movement, recruitment, and on-reef oyster vital rates would assist in balancing the goals of conservation, restoration, and fisheries management of this foundational estuarine species.
{"title":"The use of conceptual ecological models to identify critical data and uncertainties to support numerical modeling: The northern Gulf of Mexico eastern oyster Crassostrea virginica example","authors":"Megan K. La Peyre, Shaye Sable, Danielle A. Marshall, Elise Irwin, Chad Hanson","doi":"10.1002/mcf2.10297","DOIUrl":"10.1002/mcf2.10297","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objective</h3>\u0000 \u0000 <p>Increasing reliance on numerical simulation models to help inform management and restoration choices benefits from careful consideration of critical early steps in model development. Along the northern coast of the Gulf of Mexico, the eastern oyster <i>Crassostrea virginica</i> fulfills important ecological and economic roles. Using the eastern oyster as an example, we draw on several recent frameworks outlining best practices for model development and application for restoration, conservation, and management.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>We identify priority model questions, outline a conceptual ecological model (CEM) to guide numerical model development, and use this framework to identify uncertainties and research needs.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Result</h3>\u0000 \u0000 <p>The CEM uses a nested design, identifying explicit vital rates, processes, attributes, and outcomes for the species (oysters), population, and metapopulation (i.e., network of populations) levels in response to drivers of species, population, and metapopulation changes and changing environmental factors. Most management actions related to oyster restoration and harvest affect population attributes directly, but many coastal management actions and changes (i.e., climate change and coastal and water resource engineering) impact environmental factors that alter vital rates and attributes of oysters, populations, and metapopulations.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusion</h3>\u0000 \u0000 <p>Investment in studies targeting individual oyster- and population-level multi-stressor responses (filtration, respiration, growth, and reproduction) and improving hydrodynamic and environmental models targeting drivers that influence metapopulation vital rates and attributes (i.e., connectivity and substrate persistence) would contribute to reducing uncertainties. Development of numerical models covering the entire oyster life cycle and connectivity of populations using hydrodynamic models of current and predicted conditions to provide key abiotic and biotic factors influencing larval movement, recruitment, and on-reef oyster vital rates would assist in balancing the goals of conservation, restoration, and fisheries management of this foundational estuarine species.</p>\u0000 </section>\u0000 </div>","PeriodicalId":51257,"journal":{"name":"Marine and Coastal Fisheries","volume":"16 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mcf2.10297","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141936092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Greta J. Helmueller, Christopher D. Stallings, Steven A. Murawski, Linda A. Lombardi-Carlson
Objective
The objectives of this study were to compare population dynamics of Tilefish Lopholatilus chamaeleonticeps before and after the 2010 Deepwater Horizon (DWH) oil spill in the north-central Gulf of Mexico (GoM) as well as inside and outside the spill area in the western and southwestern GoM (off Mexico).
Methods
Due to the availability of prespill samples of Tilefish, we were able to evaluate growth, mortality, and condition factors during two time periods (2000–2009 versus 2011–2017). Samples were derived from commercial landings and research vessel surveys using demersal longline fishing gear.
Result
Although some von Bertalanffy growth parameters differed for fish caught before and after the spill within the spill area, confidence limits for predicted growth curves overlapped for ages >10, while predicted growth for ages <10 declined somewhat after the spill. Tilefish grew faster off Mexico than in the northern GoM. Total instantaneous mortality rates (Z), estimated from aggregate multi-year catch curves, were highest off Mexico (0.39 ± 0.05 SE), lowest in the western GoM outside the spill area (0.21 ± 0.03), and similar before and after the DWH spill within the spill zone (0.32 ± 0.02).
Conclusion
Although Z on the stock within the spill area apparently did not change, differences in fishing mortality may have compensated for changes in natural mortality. Because 90% of the fish that were aged after the spill were alive prior to the spill, their accumulated growth history may have masked postspill growth changes. As we are now 14+ years past the 2010 spill, comparisons of population dynamics from samples collected now and in the future may provide a clearer picture of the strength of incoming year-classes and the long-term implications of the spill on Tilefish populations.
{"title":"Temporal and spatial patterns in population demography of Tilefish in the Gulf of Mexico","authors":"Greta J. Helmueller, Christopher D. Stallings, Steven A. Murawski, Linda A. Lombardi-Carlson","doi":"10.1002/mcf2.10299","DOIUrl":"10.1002/mcf2.10299","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objective</h3>\u0000 \u0000 <p>The objectives of this study were to compare population dynamics of Tilefish <i>Lopholatilus chamaeleonticeps</i> before and after the 2010 <i>Deepwater Horizon</i> (DWH) oil spill in the north-central Gulf of Mexico (GoM) as well as inside and outside the spill area in the western and southwestern GoM (off Mexico).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>Due to the availability of prespill samples of Tilefish, we were able to evaluate growth, mortality, and condition factors during two time periods (2000–2009 versus 2011–2017). Samples were derived from commercial landings and research vessel surveys using demersal longline fishing gear.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Result</h3>\u0000 \u0000 <p>Although some von Bertalanffy growth parameters differed for fish caught before and after the spill within the spill area, confidence limits for predicted growth curves overlapped for ages >10, while predicted growth for ages <10 declined somewhat after the spill. Tilefish grew faster off Mexico than in the northern GoM. Total instantaneous mortality rates (<i>Z</i>), estimated from aggregate multi-year catch curves, were highest off Mexico (0.39 ± 0.05 SE), lowest in the western GoM outside the spill area (0.21 ± 0.03), and similar before and after the DWH spill within the spill zone (0.32 ± 0.02).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusion</h3>\u0000 \u0000 <p>Although <i>Z</i> on the stock within the spill area apparently did not change, differences in fishing mortality may have compensated for changes in natural mortality. Because 90% of the fish that were aged after the spill were alive prior to the spill, their accumulated growth history may have masked postspill growth changes. As we are now 14+ years past the 2010 spill, comparisons of population dynamics from samples collected now and in the future may provide a clearer picture of the strength of incoming year-classes and the long-term implications of the spill on Tilefish populations.</p>\u0000 </section>\u0000 </div>","PeriodicalId":51257,"journal":{"name":"Marine and Coastal Fisheries","volume":"16 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mcf2.10299","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141869059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nicholas Coleman, Dewayne Fox, Ashlee Horne, Nathan J. Hostetter, John Madsen, Michael O'Brien, Ian Park, Chuck Stence, David Secor
Objective
Once thought to be extirpated from the Chesapeake Bay, fall spawning runs of Atlantic Sturgeon Acipenser oxyrinchus have been rediscovered in the Marshyhope Creek (MC)–Nanticoke River (NR) system of Maryland, United States. High recapture rates in past telemetry surveys suggested a small population in the two connected tributaries. This study aims to generate estimates of abundance and understand within system connectivity for spawning runs in 2020 and 2021.
Methods
Data from mobile side-scan sonar surveys and detections of acoustically tagged adults on stationary telemetry receivers were analyzed in an integrated model to estimate spawning season abundance and examine run timing and system connectivity for this population. An array of acoustic receivers was deployed throughout the MC–NR system to monitor the movement of tagged fish during the spawning run period from mid-August to late October. Side-scan sonar surveys were conducted weekly in September in an area of high spawner aggregation to generate count data on spawning run abundance.
Result
In 2020 and 2021, 32 (95% credible interval [CRI] = 23–47) and 70 (95% CRI = 49–105) Atlantic Sturgeon, respectively, used the MC–NR system. The lower estimate for 2020 coincided with an earlier end to the spawning run related to cooler September temperatures in that year.
Conclusion
In both years, high spawning run connectivity between MC and the upper NR was observed. Overall, run estimates supported previous hypotheses that the MC–NR system supports a very small population and that both MC and the upper NR serve as important areas for spawning activity.
{"title":"Spawning run estimates and phenology for an extremely small population of Atlantic Sturgeon in the Marshyhope Creek–Nanticoke River system, Chesapeake Bay","authors":"Nicholas Coleman, Dewayne Fox, Ashlee Horne, Nathan J. Hostetter, John Madsen, Michael O'Brien, Ian Park, Chuck Stence, David Secor","doi":"10.1002/mcf2.10292","DOIUrl":"10.1002/mcf2.10292","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Objective</h3>\u0000 \u0000 <p>Once thought to be extirpated from the Chesapeake Bay, fall spawning runs of Atlantic Sturgeon <i>Acipenser oxyrinchus</i> have been rediscovered in the Marshyhope Creek (MC)–Nanticoke River (NR) system of Maryland, United States. High recapture rates in past telemetry surveys suggested a small population in the two connected tributaries. This study aims to generate estimates of abundance and understand within system connectivity for spawning runs in 2020 and 2021.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>Data from mobile side-scan sonar surveys and detections of acoustically tagged adults on stationary telemetry receivers were analyzed in an integrated model to estimate spawning season abundance and examine run timing and system connectivity for this population. An array of acoustic receivers was deployed throughout the MC–NR system to monitor the movement of tagged fish during the spawning run period from mid-August to late October. Side-scan sonar surveys were conducted weekly in September in an area of high spawner aggregation to generate count data on spawning run abundance.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Result</h3>\u0000 \u0000 <p>In 2020 and 2021, 32 (95% credible interval [CRI] = 23–47) and 70 (95% CRI = 49–105) Atlantic Sturgeon, respectively, used the MC–NR system. The lower estimate for 2020 coincided with an earlier end to the spawning run related to cooler September temperatures in that year.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusion</h3>\u0000 \u0000 <p>In both years, high spawning run connectivity between MC and the upper NR was observed. Overall, run estimates supported previous hypotheses that the MC–NR system supports a very small population and that both MC and the upper NR serve as important areas for spawning activity.</p>\u0000 </section>\u0000 </div>","PeriodicalId":51257,"journal":{"name":"Marine and Coastal Fisheries","volume":"16 3","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/mcf2.10292","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141502861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号