Brett T. Miller, Elizabeth A. Renner, Kyle R. Winders, Juju C. Wellemeyer, Hae H. Kim
Goldeye relative weight (Wr) and proportional size distribution (PSD) have not been able to be evaluated in populations across their range. The objective of this project was to develop and assess standard weight (Ws) equations with three different techniques along with developing standard length categories for Goldeye.
{"title":"Proposed Standard Weight (Ws) Equation and Standard Length Categories for Goldeye","authors":"Brett T. Miller, Elizabeth A. Renner, Kyle R. Winders, Juju C. Wellemeyer, Hae H. Kim","doi":"10.1002/nafm.10977","DOIUrl":"https://doi.org/10.1002/nafm.10977","url":null,"abstract":"Goldeye relative weight (<i>W</i><sub><i>r</i></sub>) and proportional size distribution (PSD) have not been able to be evaluated in populations across their range. The objective of this project was to develop and assess standard weight (<i>W</i><sub><i>s</i></sub>) equations with three different techniques along with developing standard length categories for Goldeye.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":"42 ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138505624","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}
Collin J. Farrell, Adam G. Hansen, Mandi M. Brandt, Christopher A. Myrick, Brett M. Johnson
Natural dispersal or unauthorized introductions of nonnative predatory sport fish can undermine native species conservation and other fisheries management objectives. The use of reproductively sterile triploid fish may provide a lower-risk stocking option (i.e., genetic and reproductive containment) for diversifying angling opportunities while possibly reducing angler motivation to illegally transplant fish. Management interest in triploid Walleye Stizostedion vitreum is growing, and these fish are currently stocked by several fisheries agencies. Yet, little is known about the post-stocking growth, body condition, and survival of triploid Walleye, information that is important for calibrating expectations and guiding policy regarding their use. We compared the age-specific size, body condition, and survival of subadult (i.e., ages 0–3) triploid Walleyes to normal diploid conspecifics into two eastern Colorado reservoirs. Paired stockings of triploid and diploid Walleyes occurred over 3 years. Both fry and fingerlings were stocked each year. Triploids were generally smaller in length (6.6% on average) and weight (20.6%) compared to diploids across all age-classes. Despite being smaller, triploids had similar body condition relative to diploids. On average, the survival of triploids from spring-stocking to their first fall was 6.3x lower than that of diploids, but no differences in survival were observed beyond this early life stage. This pattern was consistent across cohorts and reservoirs. This work provides a foundation for future studies designed to clarify patterns of survival from spring to first fall by accounting for size-at-stocking and natural-origin fish, and those planned to assess the post-stocking performance of triploid Walleyes independent of diploids.
{"title":"An Evaluation of the Relative Size, Body Condition, and Survival of Triploid Walleye in the Wild","authors":"Collin J. Farrell, Adam G. Hansen, Mandi M. Brandt, Christopher A. Myrick, Brett M. Johnson","doi":"10.1002/nafm.10972","DOIUrl":"https://doi.org/10.1002/nafm.10972","url":null,"abstract":"Natural dispersal or unauthorized introductions of nonnative predatory sport fish can undermine native species conservation and other fisheries management objectives. The use of reproductively sterile triploid fish may provide a lower-risk stocking option (i.e., genetic and reproductive containment) for diversifying angling opportunities while possibly reducing angler motivation to illegally transplant fish. Management interest in triploid Walleye <i>Stizostedion vitreum</i> is growing, and these fish are currently stocked by several fisheries agencies. Yet, little is known about the post-stocking growth, body condition, and survival of triploid Walleye, information that is important for calibrating expectations and guiding policy regarding their use. We compared the age-specific size, body condition, and survival of subadult (i.e., ages 0–3) triploid Walleyes to normal diploid conspecifics into two eastern Colorado reservoirs. Paired stockings of triploid and diploid Walleyes occurred over 3 years. Both fry and fingerlings were stocked each year. Triploids were generally smaller in length (6.6% on average) and weight (20.6%) compared to diploids across all age-classes. Despite being smaller, triploids had similar body condition relative to diploids. On average, the survival of triploids from spring-stocking to their first fall was 6.3x lower than that of diploids, but no differences in survival were observed beyond this early life stage. This pattern was consistent across cohorts and reservoirs. This work provides a foundation for future studies designed to clarify patterns of survival from spring to first fall by accounting for size-at-stocking and natural-origin fish, and those planned to assess the post-stocking performance of triploid Walleyes independent of diploids.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":"35 ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138505629","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}
Monica R. Blanchard, Julianne E. Harris, Joseph J. Skalicky, Gregory S. Silver, Jeffrey C. Jolley
This study compiled data sets from multiple research efforts from 2010 to 2018 to describe patterns in the presence and density of larval lampreys in deep water habitats across 430 river kilometers of the lower and middle main-stem Columbia River.
{"title":"Patterns in distribution and density of larval lampreys in the main-stem Columbia River, Washington–Oregon","authors":"Monica R. Blanchard, Julianne E. Harris, Joseph J. Skalicky, Gregory S. Silver, Jeffrey C. Jolley","doi":"10.1002/nafm.10940","DOIUrl":"https://doi.org/10.1002/nafm.10940","url":null,"abstract":"This study compiled data sets from multiple research efforts from 2010 to 2018 to describe patterns in the presence and density of larval lampreys in deep water habitats across 430 river kilometers of the lower and middle main-stem Columbia River.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":"46 ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138505623","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}
Justin Bopp, Seth J. Herbst, Travis O. Brenden, Kevin Wehrly, Jan‐Michael Hessenauer
Abstract Objective In recent decades, widespread evidence of declining Walleye Sander vitreus recruitment in the Midwestern United States has raised concerns about diminishing ecological benefits and fishing opportunities, which in turn has resulted in natural resource agencies using stocking to supplement populations. Success of Walleye stocking events vary; thus, evaluating the external factors that influence recruitment success of Walleye resulting from stocking or natural production is critical for improved management. Methods We evaluated factors influencing the relative recruitment in 98 lakes stocked annually with Walleye by integrating 20 years of stocking data with fisheries assessment and abiotic data. We indexed recruitment as the relative abundance of Walleye cohorts from natural and stocked sources combined and used boosted regression tree modeling to identify variables that are associated with varying recruitment. Result Growing degree‐days at age 1, shoreline development index, mean depth, and degree‐days at age 2 were the most important variables. The boosted regression tree model explained 17% of observed variability in recruitment. A positive relationship between growing degree‐days and Walleye recruitment was observed, whereas shoreline development and lake depth had a negative relationship with recruitment. Secondarily important predictors were lake surface area, spring warming rate, Northern Pike Esox lucius abundance, and degree‐days at age 0. In general, Walleye recruitment was positively associated with these predictors, with the exceptions of spring warming rates >0.3°C/day and being exposed to >3500 degree‐days at age 0. Conclusion Our results indicate that thermal variables in addition to lake characteristics are important recruitment drivers in stocked waters and highlights the potential for resource managers to use this information to prioritize stocking efforts in temperate lakes.
{"title":"Biotic and abiotic factors that influence Walleye recruitment in stocked lakes in Michigan","authors":"Justin Bopp, Seth J. Herbst, Travis O. Brenden, Kevin Wehrly, Jan‐Michael Hessenauer","doi":"10.1002/nafm.10946","DOIUrl":"https://doi.org/10.1002/nafm.10946","url":null,"abstract":"Abstract Objective In recent decades, widespread evidence of declining Walleye Sander vitreus recruitment in the Midwestern United States has raised concerns about diminishing ecological benefits and fishing opportunities, which in turn has resulted in natural resource agencies using stocking to supplement populations. Success of Walleye stocking events vary; thus, evaluating the external factors that influence recruitment success of Walleye resulting from stocking or natural production is critical for improved management. Methods We evaluated factors influencing the relative recruitment in 98 lakes stocked annually with Walleye by integrating 20 years of stocking data with fisheries assessment and abiotic data. We indexed recruitment as the relative abundance of Walleye cohorts from natural and stocked sources combined and used boosted regression tree modeling to identify variables that are associated with varying recruitment. Result Growing degree‐days at age 1, shoreline development index, mean depth, and degree‐days at age 2 were the most important variables. The boosted regression tree model explained 17% of observed variability in recruitment. A positive relationship between growing degree‐days and Walleye recruitment was observed, whereas shoreline development and lake depth had a negative relationship with recruitment. Secondarily important predictors were lake surface area, spring warming rate, Northern Pike Esox lucius abundance, and degree‐days at age 0. In general, Walleye recruitment was positively associated with these predictors, with the exceptions of spring warming rates >0.3°C/day and being exposed to >3500 degree‐days at age 0. Conclusion Our results indicate that thermal variables in addition to lake characteristics are important recruitment drivers in stocked waters and highlights the potential for resource managers to use this information to prioritize stocking efforts in temperate lakes.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":"225 20","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135475805","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}
Anthony L. Fritts, Gabriel M. Temple, Cade Lillquist, Dan Rawding
Abstract Objective Fishery managers often implement mark‐selective fishing regulations that provide harvest opportunity on abundant hatchery salmon populations while requiring release of at‐risk natural‐origin populations. However, implementing these decisions requires fisheries managers to account for postrelease mortality of any natural‐origin fish caught and released by anglers, which can be variable and is unknown for spring Chinook Salmon Oncorhynchus tshawytscha recreational fisheries in eastern Washington. Therefore, the objective of this study was to estimate and examine the factors affecting, the postrelease mortality of spring Chinook Salmon caught and released from an inland recreational mark–selective fishery in the Yakima River, Washington. Methods We conducted a 2‐year paired control and treatment radio‐telemetry study using 171 treatment fish caught and released during a recreational fishery and 194 control fish captured in a nearby fishway. Subjects were subsequently tracked throughout the summer, and postrelease mortality was estimated on September 1. Stepwise logistic regression was used to analyze potential explanatory variables recorded at the time of capture. Result The estimated postrelease mortality of these fish was 12% (95% CI = 2–23%) just prior to the onset of spawning. We also inferred using logistic regression that anatomical hook location explained most of the variation in mortality rates of angled fish. Conclusion Our estimate of postrelease mortality is similar to estimates derived in other studies for recreational freshwater Chinook Salmon fisheries as well as the current 10% rate used to manage Columbia River spring Chinook Salmon recreational fisheries.
摘要目的渔业管理人员经常实施标记选择性捕捞法规，为大量孵卵鲑鱼种群提供捕捞机会，同时要求释放处于危险的自然来源种群。然而，实施这些决定需要渔业管理人员对钓鱼者捕获和释放的任何自然来源鱼类的放生后死亡率进行计算，这对于华盛顿州东部的春季奇努克鲑鱼休闲渔业来说可能是可变的，并且是未知的。因此，本研究的目的是评估和检查影响华盛顿州亚基马河内陆休闲标记选择性渔业捕获和释放的春季奇努克鲑鱼放生后死亡率的因素。方法对171条在休闲渔场捕获并释放的治疗鱼和194条在附近鱼道捕获的对照鱼进行了为期2年的配对对照和治疗无线电遥测研究。研究人员随后在整个夏季对受试者进行跟踪，并在9月1日估计释放后的死亡率。逐步逻辑回归用于分析捕获时记录的潜在解释变量。结果在产卵开始前，这些鱼的放生后死亡率估计为12% (95% CI = 2-23%)。我们也使用逻辑回归推断，解剖钩的位置解释了有角度的鱼死亡率的大部分变化。我们对释放后死亡率的估计与其他研究中对休闲淡水奇努克鲑鱼渔业的估计相似，也与目前用于管理哥伦比亚河春季奇努克鲑鱼休闲渔业的10%的死亡率相似。
{"title":"Postrelease mortality of spring Chinook Salmon from a mark‐selective recreational fishery in the Yakima River, Washington","authors":"Anthony L. Fritts, Gabriel M. Temple, Cade Lillquist, Dan Rawding","doi":"10.1002/nafm.10947","DOIUrl":"https://doi.org/10.1002/nafm.10947","url":null,"abstract":"Abstract Objective Fishery managers often implement mark‐selective fishing regulations that provide harvest opportunity on abundant hatchery salmon populations while requiring release of at‐risk natural‐origin populations. However, implementing these decisions requires fisheries managers to account for postrelease mortality of any natural‐origin fish caught and released by anglers, which can be variable and is unknown for spring Chinook Salmon Oncorhynchus tshawytscha recreational fisheries in eastern Washington. Therefore, the objective of this study was to estimate and examine the factors affecting, the postrelease mortality of spring Chinook Salmon caught and released from an inland recreational mark–selective fishery in the Yakima River, Washington. Methods We conducted a 2‐year paired control and treatment radio‐telemetry study using 171 treatment fish caught and released during a recreational fishery and 194 control fish captured in a nearby fishway. Subjects were subsequently tracked throughout the summer, and postrelease mortality was estimated on September 1. Stepwise logistic regression was used to analyze potential explanatory variables recorded at the time of capture. Result The estimated postrelease mortality of these fish was 12% (95% CI = 2–23%) just prior to the onset of spawning. We also inferred using logistic regression that anatomical hook location explained most of the variation in mortality rates of angled fish. Conclusion Our estimate of postrelease mortality is similar to estimates derived in other studies for recreational freshwater Chinook Salmon fisheries as well as the current 10% rate used to manage Columbia River spring Chinook Salmon recreational fisheries.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135634939","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}
K. N. Pelekai, J. E. Hess, L. A. Weitkamp, R. T. Lampman, J. A. Miller
Abstract Objective The anadromous Pacific Lamprey Entosphenus tridentatus is an ecologically and culturally important fish that has experienced declines in abundance and distribution throughout large portions of its range. However, the lack of fundamental biological information, such as age and growth, impedes management and conservation efforts. Methods We used known‐age hatchery and wild Pacific Lamprey to evaluate the potential of statoliths (apatite concretions found within the auditory capsules) to provide estimates of individual size and age throughout ontogeny. Statolith size and growth were assessed with comparisons of morphometrics (area, perimeter, length, and width) in relation to fish length. Traditional band‐reading methods and random forest (RF) analysis were evaluated for their utility in estimating age. Result We observed a strong, positive relationship between statolith size and fish length for larvae that were hatchery reared. However, there were no positive relationships between statolith size and fish length for any of the postmetamorphic life stages, which indicates that statolith growth slows dramatically or ceases after metamorphosis. Band‐reading methods of statoliths from known‐age lamprey (1‐ and 2‐ to 9‐year‐olds) resulted in accurate age estimates for 28% of the fish, and 57% of mean age estimates fell within 1 year of the true age. While we found that the statolith was not very useful for traditional age estimation techniques, its inclusion in morphometric‐based age classifications was promising. A RF model based on body length, collection river, and statolith area accurately assigned 76% of the larval and freshwater juveniles to their known age. Additionally, an RF model using only body length and river of origin correctly classified 70% of the known‐age samples. Conclusion Multivariate approaches, including those that include lethal and nonlethal predictor variables, provide potential approaches to estimate age in larval and early juvenile Pacific Lamprey.
{"title":"Evaluation of Pacific Lamprey statoliths for age estimation across their life cycle","authors":"K. N. Pelekai, J. E. Hess, L. A. Weitkamp, R. T. Lampman, J. A. Miller","doi":"10.1002/nafm.10920","DOIUrl":"https://doi.org/10.1002/nafm.10920","url":null,"abstract":"Abstract Objective The anadromous Pacific Lamprey Entosphenus tridentatus is an ecologically and culturally important fish that has experienced declines in abundance and distribution throughout large portions of its range. However, the lack of fundamental biological information, such as age and growth, impedes management and conservation efforts. Methods We used known‐age hatchery and wild Pacific Lamprey to evaluate the potential of statoliths (apatite concretions found within the auditory capsules) to provide estimates of individual size and age throughout ontogeny. Statolith size and growth were assessed with comparisons of morphometrics (area, perimeter, length, and width) in relation to fish length. Traditional band‐reading methods and random forest (RF) analysis were evaluated for their utility in estimating age. Result We observed a strong, positive relationship between statolith size and fish length for larvae that were hatchery reared. However, there were no positive relationships between statolith size and fish length for any of the postmetamorphic life stages, which indicates that statolith growth slows dramatically or ceases after metamorphosis. Band‐reading methods of statoliths from known‐age lamprey (1‐ and 2‐ to 9‐year‐olds) resulted in accurate age estimates for 28% of the fish, and 57% of mean age estimates fell within 1 year of the true age. While we found that the statolith was not very useful for traditional age estimation techniques, its inclusion in morphometric‐based age classifications was promising. A RF model based on body length, collection river, and statolith area accurately assigned 76% of the larval and freshwater juveniles to their known age. Additionally, an RF model using only body length and river of origin correctly classified 70% of the known‐age samples. Conclusion Multivariate approaches, including those that include lethal and nonlethal predictor variables, provide potential approaches to estimate age in larval and early juvenile Pacific Lamprey.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":"29 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135774076","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 Anadromous Sea Lamprey Petromyzon marinus , native to the Atlantic coast of the USA, has declined in numbers since European contact due to the construction of barrier dams. Simply addressing the stream barriers, either by removal or the addition of fishways, has not always resulted in the restoration of runs. An experimental approach of transplanting adult lamprey from existing runs into unoccupied upstream habitat was evaluated as a tool for re‐establishing annual spawning runs of the species. Methods Two coastal watersheds without Sea Lamprey runs but with dams with fishways close to the ocean were selected for testing. Prespawn adult Sea Lamprey captured from another river were released in suitable habitat upstream of the dam in one river but not the other. Counts of adult Sea Lamprey ascending the river via the fishways in subsequent years were made and compared between the two rivers. Data of colonizing adult Sea Lamprey in other rivers were analyzed for further comparison. Result In subsequent years, adult Sea Lamprey only immigrated into the river that received transplanted adults. When adult Sea Lampreys were finally released into the second river years later, an annual run of adult Sea Lamprey was re‐established in that stream as well. Conclusion Prespawn adult Sea Lamprey will not emigrate from the ocean into a stream with no resident larval Sea Lamprey. The release of prespawn adults into a vacant habitat resulted in spawning, which produced a resident population of larval Sea Lamprey. Such larvae produce attractant pheromones, which is necessary to attract adults. If a stream has an extant run of Sea Lamprey, removal of a migratory barrier will result in the run expanding upstream into previously vacant habitat. Transplantation of prespawn adult Sea Lamprey can be an important management tool for restoring lost runs of this important anadromous species.
{"title":"Transplantation of prespawn adult Sea Lampreys as an important restoration strategy","authors":"Stephen Gephard","doi":"10.1002/nafm.10941","DOIUrl":"https://doi.org/10.1002/nafm.10941","url":null,"abstract":"Abstract Objective Anadromous Sea Lamprey Petromyzon marinus , native to the Atlantic coast of the USA, has declined in numbers since European contact due to the construction of barrier dams. Simply addressing the stream barriers, either by removal or the addition of fishways, has not always resulted in the restoration of runs. An experimental approach of transplanting adult lamprey from existing runs into unoccupied upstream habitat was evaluated as a tool for re‐establishing annual spawning runs of the species. Methods Two coastal watersheds without Sea Lamprey runs but with dams with fishways close to the ocean were selected for testing. Prespawn adult Sea Lamprey captured from another river were released in suitable habitat upstream of the dam in one river but not the other. Counts of adult Sea Lamprey ascending the river via the fishways in subsequent years were made and compared between the two rivers. Data of colonizing adult Sea Lamprey in other rivers were analyzed for further comparison. Result In subsequent years, adult Sea Lamprey only immigrated into the river that received transplanted adults. When adult Sea Lampreys were finally released into the second river years later, an annual run of adult Sea Lamprey was re‐established in that stream as well. Conclusion Prespawn adult Sea Lamprey will not emigrate from the ocean into a stream with no resident larval Sea Lamprey. The release of prespawn adults into a vacant habitat resulted in spawning, which produced a resident population of larval Sea Lamprey. Such larvae produce attractant pheromones, which is necessary to attract adults. If a stream has an extant run of Sea Lamprey, removal of a migratory barrier will result in the run expanding upstream into previously vacant habitat. Transplantation of prespawn adult Sea Lamprey can be an important management tool for restoring lost runs of this important anadromous species.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":"29 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135870514","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}
Mary C. Spanos, Curry J. Cunningham, Katie A. Drew, Trent M. Sutton
Abstract Objective Arctic Lampreys Lethenteron camtschaticum are harvested by subsistence and commercial fisheries in the Yukon–Kuskokwim River region of Alaska; however, baseline population data are deficient. For mark–recapture and telemetry studies to be effectively implemented to assess Arctic Lamprey abundance, migratory and dispersal patterns, and spawning locations, tags must not impact fish survival, physiology, or behavior. Methods For this laboratory evaluation, we examined survival, tag retention, swim endurance at short‐term (1 day posttreatment) and long‐term (43 days [~6 weeks] posttreatment) intervals, and incision healing for T‐bar‐tagged and radio‐tagged prespawn Yukon River Arctic Lampreys ( N = 216). Six treatment groups were evaluated: control; sham surgery; external T‐bar anchor tag; and small (0.30 g; 0.1–0.4% tag burden [ratio of tag weight to fish body weight]), medium (0.57 g; 0.2–0.8% tag burden), and large (1.50 g; 0.6–1.9% tag burden) internal dummy radio transmitter tags. Result Although all lampreys survived tagging and surgical procedures through the first 4 weeks of the experiment, a higher tag burden was associated with an increased mortality hazard up to 35 weeks postsurgery. Over the 14‐week experimental period, one T‐bar tag and one small radio tag were shed by lampreys. Although treatment was not a significant predictor of swim endurance, a higher tag burden led to reductions in swim endurance at 1 day posttreatment but not at 43 days posttreatment. Healing did not differ among surgical treatment groups, but persistent inflammation was observed at incision sites and skin erosion was observed at antenna protrusion locations. Conclusion These results indicate that T‐bar anchor tags and internal radio tags are acceptable for Arctic Lamprey tagging studies if the radio tag burden is ≤1.3% for short‐term (≤14‐week) studies and ≤0.5% for long‐term (≥14‐week) studies.
{"title":"Evaluating the viability of the use of T‐bar and radiotelemetry tags on prespawn Arctic Lampreys","authors":"Mary C. Spanos, Curry J. Cunningham, Katie A. Drew, Trent M. Sutton","doi":"10.1002/nafm.10939","DOIUrl":"https://doi.org/10.1002/nafm.10939","url":null,"abstract":"Abstract Objective Arctic Lampreys Lethenteron camtschaticum are harvested by subsistence and commercial fisheries in the Yukon–Kuskokwim River region of Alaska; however, baseline population data are deficient. For mark–recapture and telemetry studies to be effectively implemented to assess Arctic Lamprey abundance, migratory and dispersal patterns, and spawning locations, tags must not impact fish survival, physiology, or behavior. Methods For this laboratory evaluation, we examined survival, tag retention, swim endurance at short‐term (1 day posttreatment) and long‐term (43 days [~6 weeks] posttreatment) intervals, and incision healing for T‐bar‐tagged and radio‐tagged prespawn Yukon River Arctic Lampreys ( N = 216). Six treatment groups were evaluated: control; sham surgery; external T‐bar anchor tag; and small (0.30 g; 0.1–0.4% tag burden [ratio of tag weight to fish body weight]), medium (0.57 g; 0.2–0.8% tag burden), and large (1.50 g; 0.6–1.9% tag burden) internal dummy radio transmitter tags. Result Although all lampreys survived tagging and surgical procedures through the first 4 weeks of the experiment, a higher tag burden was associated with an increased mortality hazard up to 35 weeks postsurgery. Over the 14‐week experimental period, one T‐bar tag and one small radio tag were shed by lampreys. Although treatment was not a significant predictor of swim endurance, a higher tag burden led to reductions in swim endurance at 1 day posttreatment but not at 43 days posttreatment. Healing did not differ among surgical treatment groups, but persistent inflammation was observed at incision sites and skin erosion was observed at antenna protrusion locations. Conclusion These results indicate that T‐bar anchor tags and internal radio tags are acceptable for Arctic Lamprey tagging studies if the radio tag burden is ≤1.3% for short‐term (≤14‐week) studies and ≤0.5% for long‐term (≥14‐week) studies.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":"127 34","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135813498","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}
The geoduck show‐factor is the probability an individual geoduck is detectable to a diver during a stock assessment survey. This paper presents three methods to estimate geoduck show‐factor from data collected from long term show‐factor plots near Marina Island, British Columbia. Divers surveyed the plots 21 times over a 32‐month period. Two of the methods estimate show‐factors at the time of data collection while the third method treats show‐factor as a function of the time of year. All three methods generate probabilistic results.Each method of show‐factor analysis indicated a strong seasonal effect. Show‐factors were highest from March to June and lowest from October to December. The difference between the high and low show‐factors was at least a factor of two.The three methods generated estimates of show‐factor that are generally lower than the values previously used as part of stock assessment on the coast of British Columbia. As a result, there is the possibility that previous estimates of show‐factor contributed a negative bias to estimates of geoduck abundance.As an ancillary objective, this paper presents a strategy for removing outliers from the long term show‐factor data. Outliers did not change the general trends but did affect the quantitative results.
{"title":"Estimating Seasonal Geoduck (<i>Panopea generosa</i>) Show‐Factors from Long Term Observation","authors":"Wayne Hajas, Mike Atkins","doi":"10.1002/nafm.10968","DOIUrl":"https://doi.org/10.1002/nafm.10968","url":null,"abstract":"The geoduck show‐factor is the probability an individual geoduck is detectable to a diver during a stock assessment survey. This paper presents three methods to estimate geoduck show‐factor from data collected from long term show‐factor plots near Marina Island, British Columbia. Divers surveyed the plots 21 times over a 32‐month period. Two of the methods estimate show‐factors at the time of data collection while the third method treats show‐factor as a function of the time of year. All three methods generate probabilistic results.Each method of show‐factor analysis indicated a strong seasonal effect. Show‐factors were highest from March to June and lowest from October to December. The difference between the high and low show‐factors was at least a factor of two.The three methods generated estimates of show‐factor that are generally lower than the values previously used as part of stock assessment on the coast of British Columbia. As a result, there is the possibility that previous estimates of show‐factor contributed a negative bias to estimates of geoduck abundance.As an ancillary objective, this paper presents a strategy for removing outliers from the long term show‐factor data. Outliers did not change the general trends but did affect the quantitative results.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":"205 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136135232","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}
Jorden R. McKenna, Anjanette Bowen, John R. Farver, James M. Long, Jeffrey G. Miner, Nathan D. Stott, Patrick M. Kočovský
Abstract Objective Silver Chub Macrhybopsis storeriana , a predominately riverine species throughout its native range, exists within Lake Erie as the only known lake population. Its population declined in the 1950s and never fully recovered. Canada has listed Silver Chub in the Great Lakes–St. Lawrence River as endangered and has initiated a recovery plan that recognized the identification of spawning areas as a critical component to inform Silver Chub's recovery potential. Methods We investigated potential spawning locations of Silver Chub using capture records, otolith microchemistry, and daily age analysis. Lapillus otolith Sr:Ca ratios from 27 age‐0 Silver Chub were used to identify potential spawning areas. Daily ages estimated from lapilli were used to calculate hatch dates, which then were compared with capture data of adults and river flows to further inform potential spawning areas. Result The Detroit River (and its nearshore area) was all but ruled out as a potential spawning location. The Maumee, Portage, and Sandusky rivers or their nearshore areas were all possible spawning locations. Projected hatch dates spanned the end of May through the end of June and occurred across a wide range of flows, although some peaks in hatch dates corresponded to flow peaks, indicating recruitment is potentially enhanced by high flows. Conclusion Silver Chub spawning period and hypothesized spawning rivers or lacustuaries overlap those of invasive Grass Carp Ctenopharyngodon idella , creating a need to jointly consider Grass Carp control efforts with conservation of Silver Chub when assessing management alternatives. Further research on spawning guild and the use of rivers themselves or nearshore areas influenced by rivers as spawning areas are required to maximize potential for conservation and recovery of Silver Chub.
{"title":"Assessing potential spawning locations of Silver Chub in Lake Erie","authors":"Jorden R. McKenna, Anjanette Bowen, John R. Farver, James M. Long, Jeffrey G. Miner, Nathan D. Stott, Patrick M. Kočovský","doi":"10.1002/nafm.10870","DOIUrl":"https://doi.org/10.1002/nafm.10870","url":null,"abstract":"Abstract Objective Silver Chub Macrhybopsis storeriana , a predominately riverine species throughout its native range, exists within Lake Erie as the only known lake population. Its population declined in the 1950s and never fully recovered. Canada has listed Silver Chub in the Great Lakes–St. Lawrence River as endangered and has initiated a recovery plan that recognized the identification of spawning areas as a critical component to inform Silver Chub's recovery potential. Methods We investigated potential spawning locations of Silver Chub using capture records, otolith microchemistry, and daily age analysis. Lapillus otolith Sr:Ca ratios from 27 age‐0 Silver Chub were used to identify potential spawning areas. Daily ages estimated from lapilli were used to calculate hatch dates, which then were compared with capture data of adults and river flows to further inform potential spawning areas. Result The Detroit River (and its nearshore area) was all but ruled out as a potential spawning location. The Maumee, Portage, and Sandusky rivers or their nearshore areas were all possible spawning locations. Projected hatch dates spanned the end of May through the end of June and occurred across a wide range of flows, although some peaks in hatch dates corresponded to flow peaks, indicating recruitment is potentially enhanced by high flows. Conclusion Silver Chub spawning period and hypothesized spawning rivers or lacustuaries overlap those of invasive Grass Carp Ctenopharyngodon idella , creating a need to jointly consider Grass Carp control efforts with conservation of Silver Chub when assessing management alternatives. Further research on spawning guild and the use of rivers themselves or nearshore areas influenced by rivers as spawning areas are required to maximize potential for conservation and recovery of Silver Chub.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135824275","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}
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