David R. Smith, J. Warren Schlechte, Randall A. Myers, Michael A. Dance, Jacob D. Norman, Mitchell T. Nisbet
Abstract We applied generalized additive models to analyze creel data collected at 53 reservoirs between 2003 and 2021 to evaluate seasonal, spatial, and environmental predictors of angler catch rate and effort density (i.e., angler hrs/ha) within Texas black bass fisheries. Season significantly affected models with strong positive effects on catch rates during the spring and fall and strong positive effects on effort densities during the spring. Quarterly (i.e., three months) fluctuations in water level were identified as environmental drivers of catch rates and effort density during the springtime. Percent full (i.e., relative surface area to full pool) was also identified as a significant predictor with increasing effort densities and catch rates at higher levels of percent full. Our study provides a comparative baseline for future evaluations of black bass fisheries in Texas and a depiction of key factors influencing black bass angler catch rates and effort densities using a modeling approach that may be applied within a variety of fisheries research applications.
{"title":"Seasonal, spatial, and water level predictors of angler catch and effort within Texas black bass reservoir fisheries","authors":"David R. Smith, J. Warren Schlechte, Randall A. Myers, Michael A. Dance, Jacob D. Norman, Mitchell T. Nisbet","doi":"10.1002/nafm.10963","DOIUrl":"https://doi.org/10.1002/nafm.10963","url":null,"abstract":"Abstract We applied generalized additive models to analyze creel data collected at 53 reservoirs between 2003 and 2021 to evaluate seasonal, spatial, and environmental predictors of angler catch rate and effort density (i.e., angler hrs/ha) within Texas black bass fisheries. Season significantly affected models with strong positive effects on catch rates during the spring and fall and strong positive effects on effort densities during the spring. Quarterly (i.e., three months) fluctuations in water level were identified as environmental drivers of catch rates and effort density during the springtime. Percent full (i.e., relative surface area to full pool) was also identified as a significant predictor with increasing effort densities and catch rates at higher levels of percent full. Our study provides a comparative baseline for future evaluations of black bass fisheries in Texas and a depiction of key factors influencing black bass angler catch rates and effort densities using a modeling approach that may be applied within a variety of fisheries research applications.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135457980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jeff F. Brunson, Kimberly A. Sitta, Peter R. Kingsley‐Smith, Michael R. Kendrick
Abstract Objective The Atlantic Blue Crab Callinectes sapidus is an ecologically‐ and economically‐important species that supports one of the highest valued commercial fisheries in coastal South Carolina, USA. Researchers at the South Carolina Department of Natural Resources conduct multiple surveys to monitor the status of the Atlantic Blue Crab using a variety of gear configurations. Demographic characterizations can often be influenced by sampling gear‐related biases. Methods We compared blue crab sex ratios between passive, pot‐based sampling and active, trawl‐based sampling across three estuaries in the fall and for year‐round sampling in a single estuary (Ashley River, SC). Result During the fall, the percent of males collected in pot‐based sampling was 20.1% higher than the percent of males collected in trawl‐based sampling. Furthermore, an overall male bias of 23.1% was observed for year‐round sampling in the Ashley River, SC; however, this bias was only significant in certain months. Conclusion Our findings suggest that while particular sampling gears may have specific advantages, such as greater suitability to effectively sample certain habitats, the resulting characterizations of population demographics can differ among gear types. Recognizing gear related biases is important for ensuring that field surveys are representative of population demographics, particularly when sex‐specific modeling approaches are used as part of stock assessments to determine population status.
摘要目的大西洋蓝蟹(Callinectes sapidus)是美国南卡罗来纳州沿海地区价值最高的商业渔业之一，具有重要的生态和经济价值。南卡罗来纳自然资源部的研究人员使用各种装备进行了多次调查，以监测大西洋蓝蟹的状况。人口统计学特征通常会受到采样齿轮相关偏差的影响。方法我们比较了三个河口的被动的、基于锅的采样和主动的、基于拖网的采样在秋季的蓝蟹性比，以及在一个河口的全年采样(Ashley River, SC)。结果在秋季期间，盆式取样的男性取样率比拖网取样的男性取样率高20.1%。此外，在南卡罗来纳州阿什利河的全年采样中，总体男性偏差为23.1%;然而，这种偏差仅在某些月份显著。我们的研究结果表明，虽然特定的采样齿轮可能具有特定的优势，例如更适合于有效地采样某些栖息地，但所得的人口统计特征可能因齿轮类型而异。认识到与渔具相关的偏差对于确保实地调查具有人口统计学的代表性非常重要，特别是当使用特定性别的建模方法作为种群评估的一部分以确定种群状况时。
{"title":"Evidence for a Male Bias in Atlantic Blue Crab Pot‐Based Sampling","authors":"Jeff F. Brunson, Kimberly A. Sitta, Peter R. Kingsley‐Smith, Michael R. Kendrick","doi":"10.1002/nafm.10962","DOIUrl":"https://doi.org/10.1002/nafm.10962","url":null,"abstract":"Abstract Objective The Atlantic Blue Crab Callinectes sapidus is an ecologically‐ and economically‐important species that supports one of the highest valued commercial fisheries in coastal South Carolina, USA. Researchers at the South Carolina Department of Natural Resources conduct multiple surveys to monitor the status of the Atlantic Blue Crab using a variety of gear configurations. Demographic characterizations can often be influenced by sampling gear‐related biases. Methods We compared blue crab sex ratios between passive, pot‐based sampling and active, trawl‐based sampling across three estuaries in the fall and for year‐round sampling in a single estuary (Ashley River, SC). Result During the fall, the percent of males collected in pot‐based sampling was 20.1% higher than the percent of males collected in trawl‐based sampling. Furthermore, an overall male bias of 23.1% was observed for year‐round sampling in the Ashley River, SC; however, this bias was only significant in certain months. Conclusion Our findings suggest that while particular sampling gears may have specific advantages, such as greater suitability to effectively sample certain habitats, the resulting characterizations of population demographics can differ among gear types. Recognizing gear related biases is important for ensuring that field surveys are representative of population demographics, particularly when sex‐specific modeling approaches are used as part of stock assessments to determine population status.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135458456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Grace Auringer, Matthew A. Campbell, Pascale A. L. Goertler, Amanda J. Finger
Abstract Protecting biodiversity is important for preserving ecosystem functions and services, and understanding the diversity present in a system is necessary for effective conservation. Lampreys display extensive diversity in morphology and life history strategy. The extent of this diversity and the underlying genetic patterns have not yet been fully characterized. Uncertainty about species boundaries and operational taxonomic units hinders lamprey management and conservation. Limited data have been collected on California lampreys ( Lampetra spp., Entosphenus spp.), but evidence suggests widespread population decline across the west coast of North America. This study utilized DNA barcoding, phylogenetic analysis, and species delimitation analysis to identify which nominal species are present at study sites across northern and central California, determine whether current taxonomic classifications accurately and sufficiently describe lamprey diversity in California, and characterize the biogeographic distribution of genetically distinct lamprey lineages across the study area. Lamprey individuals (N=89) from 19 sites in the Sacramento‐San Joaquin River basin, San Francisco Bay, and Klamath River basin were sequenced for the mitochondrial cytochrome b ( cyt b ) gene and combined with publicly available lamprey cyt b sequences for analysis. Results showed relatively deep phylogenetic divergence between Lampetra and Entosphenus . Distinct and genetically divergent lineages were observed within Lampetra, while distinct but genetically similar lineages were observed within Entosphenus . This study revealed novel Lampetra lineages in Napa River and Alameda Creek, and results suggest that the biogeographic distribution of lamprey diversity may follow patterns observed in other native fishes. Species delimitation results indicated at least seven separate candidate species of Lampetra can be found in California, suggesting that California holds more species‐level diversity than the expected three nominal Lampetra species known to occur in the state. These results highlight the underestimated diversity of lamprey in California and the need for further assessment of taxonomic classifications and operational taxonomic unit designations of California lampreys.
{"title":"Lampreys in California (<i>Lampetra</i> and <i>Entosphenus</i> spp.): Mitochondrial phylogenetic analysis reveals previously unrecognized lamprey diversity","authors":"Grace Auringer, Matthew A. Campbell, Pascale A. L. Goertler, Amanda J. Finger","doi":"10.1002/nafm.10959","DOIUrl":"https://doi.org/10.1002/nafm.10959","url":null,"abstract":"Abstract Protecting biodiversity is important for preserving ecosystem functions and services, and understanding the diversity present in a system is necessary for effective conservation. Lampreys display extensive diversity in morphology and life history strategy. The extent of this diversity and the underlying genetic patterns have not yet been fully characterized. Uncertainty about species boundaries and operational taxonomic units hinders lamprey management and conservation. Limited data have been collected on California lampreys ( Lampetra spp., Entosphenus spp.), but evidence suggests widespread population decline across the west coast of North America. This study utilized DNA barcoding, phylogenetic analysis, and species delimitation analysis to identify which nominal species are present at study sites across northern and central California, determine whether current taxonomic classifications accurately and sufficiently describe lamprey diversity in California, and characterize the biogeographic distribution of genetically distinct lamprey lineages across the study area. Lamprey individuals (N=89) from 19 sites in the Sacramento‐San Joaquin River basin, San Francisco Bay, and Klamath River basin were sequenced for the mitochondrial cytochrome b ( cyt b ) gene and combined with publicly available lamprey cyt b sequences for analysis. Results showed relatively deep phylogenetic divergence between Lampetra and Entosphenus . Distinct and genetically divergent lineages were observed within Lampetra, while distinct but genetically similar lineages were observed within Entosphenus . This study revealed novel Lampetra lineages in Napa River and Alameda Creek, and results suggest that the biogeographic distribution of lamprey diversity may follow patterns observed in other native fishes. Species delimitation results indicated at least seven separate candidate species of Lampetra can be found in California, suggesting that California holds more species‐level diversity than the expected three nominal Lampetra species known to occur in the state. These results highlight the underestimated diversity of lamprey in California and the need for further assessment of taxonomic classifications and operational taxonomic unit designations of California lampreys.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136343025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tyler Steven Coleman, Robert W. Eckelbecker, Andrew K. Carlson, Dennis R. DeVries, Russell A. Wright, Benjamin A. Staton, Stephen W. Parker, Collin R. Chittam, Richard G. Lovell, Matthew J. Catalano
Abstract Reducing Largemouth Bass Micropterus salmoides recruitment and therefore population density could benefit recreational fisheries in small impoundments by improving individual growth rates and increasing the average size and condition of Largemouth Bass. To achieve these effects, methods of Largemouth Bass recruitment control should avoid reducing the productivity of their primary prey species, Bluegill Lepomis macrochirus . We tested this hypothesis by evaluating the effects of shoreline rotenone application on Bluegill and age‐0 and age‐1 Largemouth Bass density, growth, and survival in 15 Alabama small impoundments. Following treatment, Largemouth Bass age‐0 densities declined and mean age‐1 length increased, whereas Bluegill populations were not significantly reduced. Our study indicates that shoreline rotenone application may be a valuable method for reducing Largemouth Bass recruitment and increasing Largemouth Bass age‐1 growth in small impoundments. However, further research is needed to understand the effects of treatment on non‐target fishes and better assess the effects of factors such as impoundment surface area and treatment frequency and duration on the ultimate utility of the approach.
{"title":"Evaluation of shoreline rotenone application to control Largemouth Bass recruitment in small impoundments","authors":"Tyler Steven Coleman, Robert W. Eckelbecker, Andrew K. Carlson, Dennis R. DeVries, Russell A. Wright, Benjamin A. Staton, Stephen W. Parker, Collin R. Chittam, Richard G. Lovell, Matthew J. Catalano","doi":"10.1002/nafm.10953","DOIUrl":"https://doi.org/10.1002/nafm.10953","url":null,"abstract":"Abstract Reducing Largemouth Bass Micropterus salmoides recruitment and therefore population density could benefit recreational fisheries in small impoundments by improving individual growth rates and increasing the average size and condition of Largemouth Bass. To achieve these effects, methods of Largemouth Bass recruitment control should avoid reducing the productivity of their primary prey species, Bluegill Lepomis macrochirus . We tested this hypothesis by evaluating the effects of shoreline rotenone application on Bluegill and age‐0 and age‐1 Largemouth Bass density, growth, and survival in 15 Alabama small impoundments. Following treatment, Largemouth Bass age‐0 densities declined and mean age‐1 length increased, whereas Bluegill populations were not significantly reduced. Our study indicates that shoreline rotenone application may be a valuable method for reducing Largemouth Bass recruitment and increasing Largemouth Bass age‐1 growth in small impoundments. However, further research is needed to understand the effects of treatment on non‐target fishes and better assess the effects of factors such as impoundment surface area and treatment frequency and duration on the ultimate utility of the approach.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135132867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C. Ryan Hill, Abigale Culberson, Antóin M. O’Sullivan, Joke Adesola, R. Allen Curry, Tommi Linnansaari, Philip M. Harrison
Abstract Passive integrated transponder (PIT) telemetry is commonly used to monitor fish movements and behavior. To reduce inferential bias in PIT telemetry studies, it is important to quantify the effects of tagging procedures on fish survival. To this end, we conducted a controlled experiment to test the hypothesis that intraperitoneal injection of 23 mm PIT tags would have no effect on the survival of adult Blueback Herring Alosa aestivalis . We compared mortality rates of tagged and untagged Blueback Herring (n = 174; size range 202‐277 cm) that were retained in experimental tanks for 14‐days and observed no difference in the probability of survival between tagged (50% survival) and untagged (42%) groups. These results suggest that intraperitoneal tag injection is a safe and effective method of PIT tagging adult Blueback Herring and supports the use of this technique in field telemetry studies.
{"title":"Management Brief: A controlled experimental assessment of intraperitoneal PIT tag injection on survival of blueback herring (<i>Alosa aestivalis</i>)","authors":"C. Ryan Hill, Abigale Culberson, Antóin M. O’Sullivan, Joke Adesola, R. Allen Curry, Tommi Linnansaari, Philip M. Harrison","doi":"10.1002/nafm.10960","DOIUrl":"https://doi.org/10.1002/nafm.10960","url":null,"abstract":"Abstract Passive integrated transponder (PIT) telemetry is commonly used to monitor fish movements and behavior. To reduce inferential bias in PIT telemetry studies, it is important to quantify the effects of tagging procedures on fish survival. To this end, we conducted a controlled experiment to test the hypothesis that intraperitoneal injection of 23 mm PIT tags would have no effect on the survival of adult Blueback Herring Alosa aestivalis . We compared mortality rates of tagged and untagged Blueback Herring (n = 174; size range 202‐277 cm) that were retained in experimental tanks for 14‐days and observed no difference in the probability of survival between tagged (50% survival) and untagged (42%) groups. These results suggest that intraperitoneal tag injection is a safe and effective method of PIT tagging adult Blueback Herring and supports the use of this technique in field telemetry studies.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135247791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Objective Proliferation of consumer‐grade live‐imaging sonar (LIS) has created management challenges in recreational fisheries. Most pervasive are questions about whether LIS users catch fish more effectively than non‐users. This project was designed to elucidate effects of LIS use on catch of Blue Catfish Ictalurus furcatus from Milford Reservoir, Kansas. Additionally, we sought to identify angler perception of LIS and quantify differences in angling behavior between users and non‐users. Methods We organized a Blue Catfish angling experiment where 16 anglers used LIS and 16 anglers did not. The experiment was followed by dissemination of a survey to measure angler experience and skill, perception of LIS, and identify behavior patterns from groups that did and did not have access to the technology. A multivariate linear model was used to identify how LIS use, angling experience, and self‐assessed angling skill influenced fish catch. Comparisons of LIS perceptions and angling behavior were also evaluated between treatment groups. Result There was no difference in Blue Catfish mass captured per five‐hour angling trial by anglers using LIS (mean = 14.57 kg, SE = 3.38) and anglers not using LIS (mean = 16.97 kg, SE = 2.29). However, self‐rating of angling skill was identified as a predictor in a supported model but little variation in catch was explained ( R 2 = 0.169). Anglers using LIS thought their time spent searching and catch would have been similar if they did not use LIS. Anglers that did not use LIS thought they would spend more time searching for fish and catch may have increased if using LIS. Time spent searching for angling locations was greater for anglers using LIS than those not using LIS. Conclusion Results from this study suggest use of LIS may influence Blue Catfish angler perception and behavior more than catch.
摘要目的消费级实时成像声纳(LIS)的激增给休闲渔业带来了管理挑战。最普遍的问题是，使用人工智能的人是否比不使用人工智能的人更有效地捕鱼。本项目旨在阐明LIS的使用对堪萨斯州米尔福德水库蓝鲶捕捞量的影响。此外，我们试图确定垂钓者对LIS的感知，并量化垂钓者和非垂钓者在垂钓行为上的差异。方法组织蓝鲶垂钓实验，16名垂钓者使用LIS, 16名未使用LIS。实验之后，进行了一项调查，以衡量垂钓者的经验和技能，对LIS的感知，并从有和没有获得该技术的群体中确定行为模式。使用多元线性模型来确定LIS的使用、钓鱼经验和自我评估的钓鱼技巧如何影响渔获量。各组间的LIS知觉和垂钓行为也进行了比较。结果使用LIS的垂钓者和未使用LIS的垂钓者每5小时捕获的蓝鲶质量(平均= 14.57 kg, SE = 3.38)无显著差异(平均= 16.97 kg, SE = 2.29)。然而，在一个支持的模型中，钓鱼技能的自评被确定为预测因子，但捕获量的变化很小(r2 = 0.169)。使用LIS的垂钓者认为，如果他们不使用LIS，他们花在搜索和捕获上的时间将是相似的。不使用LIS的垂钓者认为，如果使用LIS，他们会花更多的时间寻找鱼，而捕获的鱼可能会增加。使用LIS的垂钓者搜寻垂钓地点的时间比不使用LIS的垂钓者要长。结论LIS的使用对蓝鲶的感知和行为的影响大于对渔获量的影响。
{"title":"Effects of live‐imaging sonar on Blue Catfish angler success, perception, and behavior","authors":"Ben C. Neely, Jeff D. Koch, Keith B. Gido","doi":"10.1002/nafm.10958","DOIUrl":"https://doi.org/10.1002/nafm.10958","url":null,"abstract":"Abstract Objective Proliferation of consumer‐grade live‐imaging sonar (LIS) has created management challenges in recreational fisheries. Most pervasive are questions about whether LIS users catch fish more effectively than non‐users. This project was designed to elucidate effects of LIS use on catch of Blue Catfish Ictalurus furcatus from Milford Reservoir, Kansas. Additionally, we sought to identify angler perception of LIS and quantify differences in angling behavior between users and non‐users. Methods We organized a Blue Catfish angling experiment where 16 anglers used LIS and 16 anglers did not. The experiment was followed by dissemination of a survey to measure angler experience and skill, perception of LIS, and identify behavior patterns from groups that did and did not have access to the technology. A multivariate linear model was used to identify how LIS use, angling experience, and self‐assessed angling skill influenced fish catch. Comparisons of LIS perceptions and angling behavior were also evaluated between treatment groups. Result There was no difference in Blue Catfish mass captured per five‐hour angling trial by anglers using LIS (mean = 14.57 kg, SE = 3.38) and anglers not using LIS (mean = 16.97 kg, SE = 2.29). However, self‐rating of angling skill was identified as a predictor in a supported model but little variation in catch was explained ( R 2 = 0.169). Anglers using LIS thought their time spent searching and catch would have been similar if they did not use LIS. Anglers that did not use LIS thought they would spend more time searching for fish and catch may have increased if using LIS. Time spent searching for angling locations was greater for anglers using LIS than those not using LIS. Conclusion Results from this study suggest use of LIS may influence Blue Catfish angler perception and behavior more than catch.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135246395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Parasitic copepods, or “gill lice,” can negatively impact fish hosts resulting in reduction in fitness and increased probability of mortality. The purpose of our study was to determine the effect of Salmincola californiensis on the vulnerability of Rainbow Trout to recreational angling and short‐term survival after being caught and released. We compared the prevalence and intensity of infection of S. californiensis on Rainbow Trout caught while angling and with a backpack electrofisher in May and October 2020 in Birch Creek, Idaho. In October, we also conducted a stress test (i.e. air exposure treatment) on trout caught by angling to determine the effects of parasitic copepods on short‐term survival of Rainbow Trout in a catch‐and‐release fishery. Infection with S. californiensis did not influence the vulnerability of Rainbow Trout to angling. After adjusting for sample size and size distribution, prevalence of infection in May was 48.3% for Rainbow Trout caught while electrofishing compared to 49.3% for Rainbow Trout caught while angling. In October, prevalence of infection was 41.2% for Rainbow Trout caught while electrofishing compared to 41.8% for Rainbow Trout caught while angling. We did not find a difference in short‐term survival of infected and uninfected Rainbow Trout after the stress test (4 ‐7 days after the test). We did not observe consequences of infection by parasitic copepods on vulnerability to angling or short‐term survival of Rainbow Trout in Birch Creek. However, conditions (i.e. low‐level of infection and relatively small fish) may not have been conducive to detecting differences in performance metrics; further testing at higher intensity of infection and with larger fish may uncover negative impacts of parasitic copepods on Rainbow Trout.
{"title":"Low‐level infection of parasitic copepods on Rainbow Trout does not affect vulnerability to angling or short‐term survival following catch‐and‐release angling","authors":"Hannah N. Swain‐Menzel, Eric J. Billman","doi":"10.1002/nafm.10957","DOIUrl":"https://doi.org/10.1002/nafm.10957","url":null,"abstract":"Abstract Parasitic copepods, or “gill lice,” can negatively impact fish hosts resulting in reduction in fitness and increased probability of mortality. The purpose of our study was to determine the effect of Salmincola californiensis on the vulnerability of Rainbow Trout to recreational angling and short‐term survival after being caught and released. We compared the prevalence and intensity of infection of S. californiensis on Rainbow Trout caught while angling and with a backpack electrofisher in May and October 2020 in Birch Creek, Idaho. In October, we also conducted a stress test (i.e. air exposure treatment) on trout caught by angling to determine the effects of parasitic copepods on short‐term survival of Rainbow Trout in a catch‐and‐release fishery. Infection with S. californiensis did not influence the vulnerability of Rainbow Trout to angling. After adjusting for sample size and size distribution, prevalence of infection in May was 48.3% for Rainbow Trout caught while electrofishing compared to 49.3% for Rainbow Trout caught while angling. In October, prevalence of infection was 41.2% for Rainbow Trout caught while electrofishing compared to 41.8% for Rainbow Trout caught while angling. We did not find a difference in short‐term survival of infected and uninfected Rainbow Trout after the stress test (4 ‐7 days after the test). We did not observe consequences of infection by parasitic copepods on vulnerability to angling or short‐term survival of Rainbow Trout in Birch Creek. However, conditions (i.e. low‐level of infection and relatively small fish) may not have been conducive to detecting differences in performance metrics; further testing at higher intensity of infection and with larger fish may uncover negative impacts of parasitic copepods on Rainbow Trout.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135248056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Gabriel J. Rossi, Mariska Obedzinski, Shelley Pneh, Sarah Nossaman Pierce, William T. Boucher, Weston M. Slaughter, Keane M. Flynn, Theodore E. Grantham
Abstract In the Western United States, juvenile salmon and steelhead are especially vulnerable to streamflow depletion in the dry season. Releasing water from off‐channel storage into small streams is a novel restoration strategy to offset impacts from anthropogenic flow alteration on salmonid fishes. To date, no studies have evaluated the ecological effects of small‐scale flow augmentations. Here, we quantify the effects of one such augmentation project on habitat connectivity, water quality, invertebrate drift, juvenile salmonid movement and survival. Our study took place in a Northern California stream and included an unusually wet summer (2019) and a more typical dry summer (2020). We found that differences in ambient streamflows between the two years mediated the physical and ecological effects of a 13.9 L/s augmentation treatment. In the dry year, habitat connectivity and dissolved oxygen markedly increased at sites > 1.5 km downstream from the point of augmentation, whereas during the wet year effects on those variables were negligible. In both years, invertebrate drift marginally increased following augmentation. Inter‐pool movement of wild juvenile steelhead ( Oncorhynchus mykiss ) and stocked Coho Salmon ( O. kisutch ) increased following augmentation during the dry summer but not the wet summer. Flow augmentation increased the survival probability for salmonids, with a larger effect during the dry summer (24% higher survival for Coho Salmon and 20% higher for steelhead), than during the wet summer (when no effect was observed for steelhead survival and Coho Salmon survival increased by 11%). This study indicates that appropriately designed small‐scale flow augmentations can improve conditions for rearing salmonids in small streams, particularly during dry years. More broadly, it provides empirical evidence that efforts to restore summer streamflow in small, salmon‐bearing streams can yield significant ecological benefits.
{"title":"Flow augmentation from off‐channel storage improves salmonid habitat and survival","authors":"Gabriel J. Rossi, Mariska Obedzinski, Shelley Pneh, Sarah Nossaman Pierce, William T. Boucher, Weston M. Slaughter, Keane M. Flynn, Theodore E. Grantham","doi":"10.1002/nafm.10954","DOIUrl":"https://doi.org/10.1002/nafm.10954","url":null,"abstract":"Abstract In the Western United States, juvenile salmon and steelhead are especially vulnerable to streamflow depletion in the dry season. Releasing water from off‐channel storage into small streams is a novel restoration strategy to offset impacts from anthropogenic flow alteration on salmonid fishes. To date, no studies have evaluated the ecological effects of small‐scale flow augmentations. Here, we quantify the effects of one such augmentation project on habitat connectivity, water quality, invertebrate drift, juvenile salmonid movement and survival. Our study took place in a Northern California stream and included an unusually wet summer (2019) and a more typical dry summer (2020). We found that differences in ambient streamflows between the two years mediated the physical and ecological effects of a 13.9 L/s augmentation treatment. In the dry year, habitat connectivity and dissolved oxygen markedly increased at sites > 1.5 km downstream from the point of augmentation, whereas during the wet year effects on those variables were negligible. In both years, invertebrate drift marginally increased following augmentation. Inter‐pool movement of wild juvenile steelhead ( Oncorhynchus mykiss ) and stocked Coho Salmon ( O. kisutch ) increased following augmentation during the dry summer but not the wet summer. Flow augmentation increased the survival probability for salmonids, with a larger effect during the dry summer (24% higher survival for Coho Salmon and 20% higher for steelhead), than during the wet summer (when no effect was observed for steelhead survival and Coho Salmon survival increased by 11%). This study indicates that appropriately designed small‐scale flow augmentations can improve conditions for rearing salmonids in small streams, particularly during dry years. More broadly, it provides empirical evidence that efforts to restore summer streamflow in small, salmon‐bearing streams can yield significant ecological benefits.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135343954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Josey L. Ridgway, Matthew R. Acre, Tyler M. Hessler, Dustin W. Broaddus, Jessica Morris, Robin D. Calfee
Abstract Removal of invasive Silver Carp Hypophthalmichthys molitrix is a primary control action in North America. Strong avoidance responses to underwater sound and electricity have been shown to facilitate herding and mass removal of these fish. We conducted a telemetry study on a closed population of Silver Carp (i.e., 10 telemetered fish) to assess fine‐scale movement responses to herding stimuli. Two herding boats traveled along bank‐to‐bank transects through the study area (longitudinal progression rate = 0.37 m/s) emitting sound and electricity (“combination technique”) or no added stimuli (“control”). The combination technique was most effective in terms of increasing fish presence (2.2 x the control) in the refuge‐zones when herding had concluded and effective range (i.e., fish reaction distance; 1.6 x the control) relative to the herding boats. Fish median (~1 m/s) and maximum (~2 m/s) swimming velocity was relatively stable across fixed effects, except for the negative influence of water depth on maximum velocity. Water depth also exhibited a negative effect on fish reaction distance. Our results suggest effective range of the combination technique was conservatively 200 m (~20 dB re 1 μPa > ambient level) when accounting for water depth in the study area. Herding deployments less than 1 m/s (longitudinal progression) could control fish passing and maintain fish movements towards an intended location. Information provided herein can serve to assist planning, design, and application of herding efforts used to manage, control, and remove these invasive fish.
摘要去除入侵鲢鱼是北美主要的防治措施。对水下声音和电流的强烈回避反应已被证明有助于这些鱼的放牧和大量清除。我们对一个封闭的鲢鱼种群(即10条被遥测的鱼)进行了遥测研究，以评估对放牧刺激的小尺度运动反应。两艘放牧船沿着研究区域的两岸横断面行驶(纵向前进速度= 0.37 m/s)，发出声音和电(“组合技术”)或不添加任何刺激(“对照组”)。在放牧结束和有效范围(即鱼的反应距离)方面，组合技术在增加保护区鱼类数量(2.2倍于对照)方面最为有效;1.6倍的控制)相对于放牧船。除水深对最大游动速度有负向影响外，固定效应下鱼类游动速度中位数(~1 m/s)和最大游动速度(~2 m/s)相对稳定。水深对鱼的反应距离也有负向影响。结果表明，组合技术的有效范围保守为200 m (~20 dB re 1 μPa >);环境水位)，考虑研究区域的水深。低于1米/秒(纵向推进)的鱼群部署可以控制鱼群的通过，并保持鱼群向预定位置移动。本文提供的信息可以帮助规划、设计和应用放牧工作，用于管理、控制和清除这些入侵鱼类。
{"title":"Silver Carp Herding: A Telemetry Evaluation of Efficacy and Implications for Design and Application","authors":"Josey L. Ridgway, Matthew R. Acre, Tyler M. Hessler, Dustin W. Broaddus, Jessica Morris, Robin D. Calfee","doi":"10.1002/nafm.10955","DOIUrl":"https://doi.org/10.1002/nafm.10955","url":null,"abstract":"Abstract Removal of invasive Silver Carp Hypophthalmichthys molitrix is a primary control action in North America. Strong avoidance responses to underwater sound and electricity have been shown to facilitate herding and mass removal of these fish. We conducted a telemetry study on a closed population of Silver Carp (i.e., 10 telemetered fish) to assess fine‐scale movement responses to herding stimuli. Two herding boats traveled along bank‐to‐bank transects through the study area (longitudinal progression rate = 0.37 m/s) emitting sound and electricity (“combination technique”) or no added stimuli (“control”). The combination technique was most effective in terms of increasing fish presence (2.2 x the control) in the refuge‐zones when herding had concluded and effective range (i.e., fish reaction distance; 1.6 x the control) relative to the herding boats. Fish median (~1 m/s) and maximum (~2 m/s) swimming velocity was relatively stable across fixed effects, except for the negative influence of water depth on maximum velocity. Water depth also exhibited a negative effect on fish reaction distance. Our results suggest effective range of the combination technique was conservatively 200 m (~20 dB re 1 μPa > ambient level) when accounting for water depth in the study area. Herding deployments less than 1 m/s (longitudinal progression) could control fish passing and maintain fish movements towards an intended location. Information provided herein can serve to assist planning, design, and application of herding efforts used to manage, control, and remove these invasive fish.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135345050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Cormack‐Joly‐Seber (CJS) mark‐recapture analysis was used to estimate the effect of travel distance and fuel costs on angling party persistence (i.e., survival = probability of remaining in the Lake Trout fishery from year‐to‐year) and visitation (i.e., detection = probability of detection at the access point) over a 14‐year period (2006‐2019) for the Lake Trout recreational fishery in Lake Opeongo, Ontario, Canada. Boat identification numbers, positioned near the bow and present by law, were used as ‘tags’ in the analysis. Complete trip creel interviews at the sole access point provided information on trip characteristics. The long‐term mark‐recapture analysis of individual angling parties showed travel distance had a significant negative effect on party persistence among years and visitation within years. The distance effect was strongest for visitation, with visitation having a more negative relationship with distance than persistence. Persistence in the lake trout fishery was insensitive to fuel costs while the fuel cost covariate had a small though significant and negative effect on visitation. Time‐varying CJS models were ranked low with little model weight indicating the distance effect estimated for Lake Opeongo was a general phenomenon and did not vary by year. A mark‐recapture approach for monitoring angling parties provides unique insights into long‐term angling patterns that can aid in travel cost estimation.
{"title":"Angling Party Persistence and Visitation in a Recreational Lake Trout Fishery: Relative Influence of Travel Distance and Fuel Costs","authors":"Emily D. Cowie, Mark S. Ridgway","doi":"10.1002/nafm.10949","DOIUrl":"https://doi.org/10.1002/nafm.10949","url":null,"abstract":"Abstract Cormack‐Joly‐Seber (CJS) mark‐recapture analysis was used to estimate the effect of travel distance and fuel costs on angling party persistence (i.e., survival = probability of remaining in the Lake Trout fishery from year‐to‐year) and visitation (i.e., detection = probability of detection at the access point) over a 14‐year period (2006‐2019) for the Lake Trout recreational fishery in Lake Opeongo, Ontario, Canada. Boat identification numbers, positioned near the bow and present by law, were used as ‘tags’ in the analysis. Complete trip creel interviews at the sole access point provided information on trip characteristics. The long‐term mark‐recapture analysis of individual angling parties showed travel distance had a significant negative effect on party persistence among years and visitation within years. The distance effect was strongest for visitation, with visitation having a more negative relationship with distance than persistence. Persistence in the lake trout fishery was insensitive to fuel costs while the fuel cost covariate had a small though significant and negative effect on visitation. Time‐varying CJS models were ranked low with little model weight indicating the distance effect estimated for Lake Opeongo was a general phenomenon and did not vary by year. A mark‐recapture approach for monitoring angling parties provides unique insights into long‐term angling patterns that can aid in travel cost estimation.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135060624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：