North American Journal of Fisheries Management最新文献

{"title":"Does release size into net‐pens affect survival of captively reared juvenile endangered suckers in Upper Klamath Lake?","authors":"John M. Caldwell, Summer M. Burdick, Jacob R. Krause, Alta C. Harris","doi":"10.1002/nafm.10933","DOIUrl":"https://doi.org/10.1002/nafm.10933","url":null,"abstract":"Abstract Objective High juvenile mortality prevents recruitment into the adult populations of endangered Shortnose Sucker Chasmistes brevirostris and Lost River Sucker Deltistes luxatus in Upper Klamath Lake, Oregon. To address the lack of recruitment, the U.S. Fish and Wildlife Service implemented the Sucker Assisted Rearing Program (SARP). Managers developing the rearing program lack information about how length at release relates to survival. To determine how initial length affects survival of captively reared juvenile suckers, we introduced juvenile suckers from the SARP into three net‐pens in Upper Klamath Lake. Methods The juvenile suckers ranged from 102 to 284 mm standard length, and each fish was tagged with a passive integrated transponder (PIT) tag. Fish were monitored continuously by PIT antennas and mortality was inferred when movements ceased. Result Estimated survival over 57 days was high in all net‐pens (0.79–1.00) and remained high at two net‐pens for 76 and 86 days. Adjusted survival curves resulting from a stratified Cox model with standard length as a covariate, indicated that length positively influenced predicted survival by as much as 41% at one site. During the study, pH and dissolved oxygen regularly exceeded no‐effect thresholds at two sites and briefly reached lethal thresholds at the same two sites but did not coincide with the observed mortalities. Slower growth and the lowest survival were observed at the third site, where water quality never exceeded thresholds. Conclusion A larger release size and the location of the net‐pen can improve the survivability of juvenile suckers in net‐pens in Upper Klamath Lake.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136359238","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}

{"title":"Avoiding a macabre future for <i>Macrhybopsis</i>—A special section on improving management and conservation of chubs","authors":"Joshuah S. Perkin, Shannon K. Brewer, Anthony A. Echelle, Patrick M. Kočovský","doi":"10.1002/nafm.10950","DOIUrl":"https://doi.org/10.1002/nafm.10950","url":null,"abstract":"Impact statement Twelve recognized species in genus Macrhybopsis are distributed across Canada, Mexico, and the United States. Most chubs have elevated conservation concerns at international, national, or state/province levels, but management intervention might reverse their trajectory of decline.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135197763","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}

{"title":"Probiotics improve survival and growth of larval Pacific Lamprey in laboratory culture","authors":"Alexa N. Maine, Mary L. Moser, Aaron D. Jackson, Frank Wilhelm","doi":"10.1002/nafm.10923","DOIUrl":"https://doi.org/10.1002/nafm.10923","url":null,"abstract":"Abstract Objective The Pacific Lamprey Entosphenus tridentatus is a First Food for members of the Confederated Tribes of the Umatilla Indian Reservation and other Columbia Plateau tribes in the Pacific Northwest. Declines in Pacific Lamprey abundance have prompted restoration efforts, including development of artificial propagation. Laboratory rearing of larvae has focused on maximizing survival and growth to conserve resources and increase production. To test the hypothesis that bacterial supplements increased the survival and growth of first‐feeding larval Pacific Lamprey, we conducted two controlled experiments. Methods First, a probiotic supplement (EPI‐CIN G2; Epicore, Bionetworks) was added to a standard food ration (yeast and Otohime mix) at two levels (2 and 5 mg/L) in a replicated, randomized design. Result Growth at 10 weeks was measured, and larvae that were fed probiotics at both levels grew significantly faster (2 mg/L: 11.0 μm/day; 5 mg/L: 13.3 μm/day) than controls that were fed the standard ration alone (6.6 μm/day). Larvae that received the probiotic supplement also had a higher survival (2 mg/L: 36%; 5 mg/L: 44%) than those fed the standard ration (24%). Next, a different cohort of larval lamprey was fed the same two levels of probiotic (at the same rate as in the first experiment), but the lamprey was kept in larger rearing pans and were fed for 28 weeks. Overall growth rates in the second experiment (2 mg/L: 4.6 μm/day; 5 mg/L: 5.7 μm/day; control 3.4 μm/day) were lower than those in the first experiment, but growth and survival (2 mg/L: 71.4%; 5 mg/L: 78.6%; control: 55.7%) were both highest in the treatments with probiotic. Moreover, in both experiments, we observed the highest growth in the probiotic treatments that also had high larval density. Conclusion This suggests that probiotics may help to overcome density‐dependent growth, which is a common problem in lamprey culture. Successful artificial propagation and culture of Pacific Lamprey are vital to the long‐term restoration goals for this imperiled First Food.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135251457","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}

{"title":"Validating morphometrics as a non‐lethal tool to determine Arctic Grayling sex.","authors":"William T. Samuel, Lauren E. Yancy, Elizabeth G. Hinkle, Jeffrey A. Falke","doi":"10.1002/nafm.10956","DOIUrl":"https://doi.org/10.1002/nafm.10956","url":null,"abstract":"Abstract Objective Some Graylings ( Thymallus spp.) possess an elongated dorsal fin and other morphological traits that can be sexually dimorphic as demonstrated in European Grayling T. thymallu s. North American Arctic Grayling T. arcticus are assumed to follow these trends, but decisive evidence is lacking. This study aimed to determine whether sexually dimorphic characteristics, including posterior dorsal height, of Arctic Grayling in Interior Alaska can be used to accurately predict fish sex. Methods We used computer imaging software to measure 22 morphometrics on 97 Arctic Grayling of known sex from streams in Interior Alaska and developed a set of binomial models to evaluate the validity of morphometrics as predictors of Arctic Grayling sex. Result Posterior dorsal height was a reasonably accurate predictor of sex (~90% accurate at fork lengths ≥ 300 mm), although models containing additional morphometrics were more accurate (100% accuracy at fork lengths ≥ 250 mm). Conclusion This study presents an affordable, non‐invasive, and replicable method for non‐lethal determination of Arctic Grayling sex using digital images from the field, with potential application to other salmonids.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135197768","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}

{"title":"An inexpensive method for reliable recovery of stream temperature data","authors":"Kevin B. Rogers, Brian W. Hodge","doi":"10.1002/nafm.10930","DOIUrl":"https://doi.org/10.1002/nafm.10930","url":null,"abstract":"Abstract Objective Water temperature is perhaps the single‐most important environmental driver of fish populations. The strong relationship between fish and water temperature allows fisheries managers to make predictions about the influence of temperature on fishes under both current and future climatic conditions. These predictions are more robust if based on year‐round and long‐term data. However, water temperature data are commonly compromised or lost altogether when data‐logging temperature sensors are damaged or go missing. In recognition of the need for reliable ways to collect long‐term, year‐round temperature data, we designed, implemented, and tested a durable but cryptic logger deployment and retrieval system. Methods We used metal housings and stakes to protect and anchor temperature loggers on the streambed and, when necessary, used a metal detector to assist with logger recovery. We then evaluated logger recovery rates across 12 years and 312 deployments at 85 sites in first‐ to ninth‐order Rocky Mountain streams and rivers. Result Although we recovered only 73% of loggers with traditional means of retrieval (e.g., GPS or photo), presumably owing to the inconspicuous nature of our metal housings and streambed anchor stakes, we recovered 96% of loggers when a metal detector was also used. Ordinal and binary logistic regression revealed that a metal detector was especially beneficial when trying to recover loggers from unfamiliar monitoring sites or those deployed for long periods of time (years). Conclusion Our methods could be replicated for a reliable and inexpensive approach to acquiring year‐round stream temperature data.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135250738","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}

{"title":"Short‐term fishery gains mask long‐term resource pains: Spatial fisheries management changes promote hyperstable <scp>CPUE</scp> in Labrador snow crab <i>Chionoecetes opilio</i> during a period of heavy exploitation","authors":"Steven P. Griffeth, Krista D. Baker, Darrell R. J. Mullowney","doi":"10.1002/nafm.10934","DOIUrl":"https://doi.org/10.1002/nafm.10934","url":null,"abstract":"Abstract Objective The snow crab Chionoecetes opilio resource in Assessment Division 2HJ has experienced prolonged high exploitation rates and reduced exploitable biomass over the past two decades. We aimed to explore whether this poor state of the resource is associated with spatial management changes made in 2003 and 2013. Methods We tested for differences in fishery performance trends before and after the implementation of spatial management which include standardized CPUE, spatial extent of fishing effort, and size at maturity of male snow crabs. Result The results show that spatial regulatory changes were successful in increasing fishery catch rates in the short term but that chronic high exploitation eventually overrode these gains, with contracted fishing patterns leading to increased localized depletion rates on dominant stock components. This ultimately culminated in a downward shift in size at maturity and other concerning biological outcomes. Conclusion The analysis demonstrates spatial management measures contributed to the present poor state of Assessment Division 2HJ snow crab and that such measures should serve as complements to—not replacements for—stringent quota control.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134944496","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}

{"title":"Mark‐Recapture Surveys Impact Nest Site Fidelity but not Reproductive Timing of Male Smallmouth Bass","authors":"Erica Stegens, Daniel D. Wiegmann, Lisa M. Angeloni, Jeffrey R. Baylis, Robert A. S. Laroche, Steven P. Newman, Scott P. Egan, Greg G. Sass, Kelly L. Weinersmith","doi":"10.1002/nafm.10964","DOIUrl":"https://doi.org/10.1002/nafm.10964","url":null,"abstract":"Abstract Fish population surveys in north‐temperate lakes are often conducted in the fall or spring when individuals are easy to capture with traditional fisheries techniques. Because some fishes are preparing to spawn or are spawning during these seasons, there is a critical need to better understand the potential influences of these surveys on decisions related to fish reproduction. We tested whether spring mark‐recapture surveys using fyke nets followed by electrofishing affect reproductive behaviors of male Smallmouth Bass Micropterus dolomieu in a northern Wisconsin lake. Fyke‐netting, electrofishing, and whole‐lake nest snorkeling surveys were conducted during 2001‐2008, and Floy‐tagged males were tracked across years to test whether capture in the fyke nets only, or capture in the electrofishing survey influenced inter‐year nest site fidelity and reproductive timing. The mark‐recapture surveys were conducted preceding Smallmouth Bass spawning, and returning males caught in the electrofishing survey nested ~50 m farther from their prior year's nest than both males captured only in fyke nets and males that were captured by neither method. Average inter‐year nest distances were ~200 m and median inter‐year nest distances were ~90 m for males not captured in the electrofishing survey. Electrofishing and fyke netting did not influence timing of reproduction. Spring electrofishing surveys for Smallmouth Bass have the potential to displace breeding males from preferred nesting habitats. If displacement negatively influences fitness (i.e., age‐0 survivorship to maturation), spring electrofishing surveys would not be recommended for assessing Smallmouth Bass populations. However, spring population surveys often occur soon after ice off, and surveys conducted at these colder temperatures are typically less stressful and less likely to result in mortality. Future research should test for fitness implications of reduced nest site fidelity following electrofishing in Smallmouth Bass, while considering potential fitness trade‐offs if surveys are moved later in the year.","PeriodicalId":19263,"journal":{"name":"North American Journal of Fisheries Management","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135739495","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}

{"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":null,"pages":null},"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}

{"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":null,"pages":null},"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}

{"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":null,"pages":null},"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}