{"title":"Effect of reduction in spatial survey effort on indices of bottom temperature for the eastern Bering Sea: Suppl. fig. 1","authors":"C. Yeung","doi":"10.7755/fb.121.3.5s1","DOIUrl":"https://doi.org/10.7755/fb.121.3.5s1","url":null,"abstract":"","PeriodicalId":50442,"journal":{"name":"Fishery Bulletin","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42797349","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}
— Bottom temperature is routinely measured as part of the bottom-trawl survey conducted every summer on the continental shelf of the eastern Bering Sea by the NOAA Alaska Fisheries Science Center. These data are widely used in ecosystem, stock assessment, and ocean modeling. We assessed the effect of alternative sampling designs and effort reduction on the quality of bottom-temperature information from the survey. Simple-random and stratified-random sampling were simulated and compared with the systematic sampling of fixed stations in the regular grid used in the standard survey, with respect to the use of survey data in the estimation of bottom temperatures and related indices. The effort simulated ranged from 34% to 100% of the full effort. In the simulated surveys, the use of each of the 3 sampling designs resulted in values of bottom-temperature metrics that are close to those from the real survey, even with as little as half the effort. Lower effort resulted in larger and more variable prediction errors of the indices. The decrease in prediction performance is most noticeable at the 34% effort level. Systematic sampling performed slightly better than simple-random and stratified-random sampling. One reason for this difference in performance is that random sampling may have been less effective than the standard sampling in capturing a small cold pool that is characteristic of the current warm ocean state.
{"title":"Effect of reduction in spatial survey effort on indices of bottom temperature for the eastern Bering Sea","authors":"C. Yeung, S. Kotwicki, S. Rohan","doi":"10.7755/fb.121.3.5","DOIUrl":"https://doi.org/10.7755/fb.121.3.5","url":null,"abstract":"— Bottom temperature is routinely measured as part of the bottom-trawl survey conducted every summer on the continental shelf of the eastern Bering Sea by the NOAA Alaska Fisheries Science Center. These data are widely used in ecosystem, stock assessment, and ocean modeling. We assessed the effect of alternative sampling designs and effort reduction on the quality of bottom-temperature information from the survey. Simple-random and stratified-random sampling were simulated and compared with the systematic sampling of fixed stations in the regular grid used in the standard survey, with respect to the use of survey data in the estimation of bottom temperatures and related indices. The effort simulated ranged from 34% to 100% of the full effort. In the simulated surveys, the use of each of the 3 sampling designs resulted in values of bottom-temperature metrics that are close to those from the real survey, even with as little as half the effort. Lower effort resulted in larger and more variable prediction errors of the indices. The decrease in prediction performance is most noticeable at the 34% effort level. Systematic sampling performed slightly better than simple-random and stratified-random sampling. One reason for this difference in performance is that random sampling may have been less effective than the standard sampling in capturing a small cold pool that is characteristic of the current warm ocean state.","PeriodicalId":50442,"journal":{"name":"Fishery Bulletin","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45181746","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}
M. Morris, R. D. Ledgerwood, Alexander J. Borsky, G. Brooks, P. J. Bentley
— A novel antenna design has been developed to detect fish implanted with full-duplex passive integrated transponder (PIT) tags. The antenna is constructed of light-weight flexible hose and measures 2.4 by 6.1 m, providing a substantially larger reading range than other PIT antennas. Herein, we describe its use in a small instream monitoring system to detect migrating smolts of steelhead ( Oncorhynchus mykiss ). During testing, the combined detection efficiency for the 2 arrays of antennas with the new design was 97%, which is comparable to efficiencies of standard antennas made with polyvinyl chloride or high-density polyethylene. The lightweight, flexible design of the new antenna affords relatively easy transportation and deployment compared with that of rigid antennas, and smaller crews and vessels are needed for its maintenance and deployment. The development of the flexible antenna has expanded the utility of PIT technology by increasing the scope of potential sampling applications to a wider range of habitats and environmental conditions.
{"title":"Development and use of a large, flexible antenna to detect fish implanted with passive integrated transponder tags","authors":"M. Morris, R. D. Ledgerwood, Alexander J. Borsky, G. Brooks, P. J. Bentley","doi":"10.7755/fb.121.3.6","DOIUrl":"https://doi.org/10.7755/fb.121.3.6","url":null,"abstract":"— A novel antenna design has been developed to detect fish implanted with full-duplex passive integrated transponder (PIT) tags. The antenna is constructed of light-weight flexible hose and measures 2.4 by 6.1 m, providing a substantially larger reading range than other PIT antennas. Herein, we describe its use in a small instream monitoring system to detect migrating smolts of steelhead ( Oncorhynchus mykiss ). During testing, the combined detection efficiency for the 2 arrays of antennas with the new design was 97%, which is comparable to efficiencies of standard antennas made with polyvinyl chloride or high-density polyethylene. The lightweight, flexible design of the new antenna affords relatively easy transportation and deployment compared with that of rigid antennas, and smaller crews and vessels are needed for its maintenance and deployment. The development of the flexible antenna has expanded the utility of PIT technology by increasing the scope of potential sampling applications to a wider range of habitats and environmental conditions.","PeriodicalId":50442,"journal":{"name":"Fishery Bulletin","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42806376","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":"Effect of reduction in spatial survey effort on indices of bottom temperature for the eastern Bering Sea: Suppl. fig. 2","authors":"C. Yeung","doi":"10.7755/fb.121.3.5s2","DOIUrl":"https://doi.org/10.7755/fb.121.3.5s2","url":null,"abstract":"","PeriodicalId":50442,"journal":{"name":"Fishery Bulletin","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42837210","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":"Timing and environmental drivers of spawning migrations of alewife (Alosa pseudoharengus) and blueback herring (A. aestivalis) in rivers of Chesapeake Bay: Supplementary figure 7","authors":"Henry D. Legett","doi":"10.7755/fb.121.3.4s7","DOIUrl":"https://doi.org/10.7755/fb.121.3.4s7","url":null,"abstract":"","PeriodicalId":50442,"journal":{"name":"Fishery Bulletin","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47415470","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":"Timing and environmental drivers of spawning migrations of alewife(Alosa pseudoharengus) and blueback herring (A. aestivalis) in rivers of Chesapeake Bay: Supplementa ry tables 3-6","authors":"Henry D. Legett","doi":"10.7755/fb.121.3.4s3","DOIUrl":"https://doi.org/10.7755/fb.121.3.4s3","url":null,"abstract":"","PeriodicalId":50442,"journal":{"name":"Fishery Bulletin","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47944369","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":"Timing and environmental drivers of spawning migrations of alewife (Alosa pseudoharengus) and blueback herring (A. aestivalis) in rivers of Chesapeake Bay: Supplementary tables 7-10","authors":"Henry D. Legett","doi":"10.7755/fb.121.3.4s6","DOIUrl":"https://doi.org/10.7755/fb.121.3.4s6","url":null,"abstract":"","PeriodicalId":50442,"journal":{"name":"Fishery Bulletin","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44565262","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":"Timing and environmental drivers of spawning migrations of alewife(Alosa pseudoharengus) and blueback herring (A. aestivalis) in rivers of Chesapeake Bay: Supplementary table 1","authors":"Henry D. Legett","doi":"10.7755/fb.121.3.4s1","DOIUrl":"https://doi.org/10.7755/fb.121.3.4s1","url":null,"abstract":"","PeriodicalId":50442,"journal":{"name":"Fishery Bulletin","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41499361","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":"Timing and environmental drivers of spawning migrations of alewife (Alosa pseudoharengus) and blueback herring (A. aestivalis) in rivers of Chesapeake Bay: Supplementary table 2","authors":"Henry D. Legett","doi":"10.7755/fb.121.3.4s2","DOIUrl":"https://doi.org/10.7755/fb.121.3.4s2","url":null,"abstract":"","PeriodicalId":50442,"journal":{"name":"Fishery Bulletin","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44919592","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}
Henry D. Legett, R. Aguilar, K. Heggie, Kimberly D. Richie, M. Ogburn
— Annual life history events, such as migration and spawning in fish, are often timed to match seasonal fluctuations in environmental conditions. Understanding phenological patterns and their drivers is needed to conserve vulnerable fish populations, particularly as climate change is disrupting seasonal transitions. In this study, we examined the phenology of spring spawning migrations of river herring, the alewife ( Alosa pseudoharengus ) and the blueback herring ( A. aestiva-lis ), in 4 rivers of Chesapeake Bay over 7 years (2013–2019). We used imaging sonar and weekly biological samples to estimate species-specific hourly fish counts in the Choptank River, Deer Creek (a tributary of Susquehanna River), Marshyhope Creek (a tributary of Nanticoke River), and the Patapsco River. Our results indicate that patterns of water temperature in spring drive spawning migrations at seasonal, daily, and hourly scales. The relationship between fish counts and other environmental factors, such as stream-flow, lunar phase, turbidity, wind stress, and tides, were annually inconsistent, and their influences on migrations may be river specific. For both species, distinct diel patterns in movement were observed. Migrations were diurnal in the Choptank River and Marshyhope Creek but nocturnal in Deer Creek and the Patapsco River. Observed interannual and inter-river variation in phenology and the influence of non-temperature factors on migrations highlight the need for long-term, multi-river monitoring of river herring in Chesapeake Bay.
{"title":"Timing and environmental drivers of spawning migrations of alewife (Alosa pseudoharengus) and blueback herring (A. aestivalis) in rivers of Chesapeake Bay","authors":"Henry D. Legett, R. Aguilar, K. Heggie, Kimberly D. Richie, M. Ogburn","doi":"10.7755/fb.121.3.4","DOIUrl":"https://doi.org/10.7755/fb.121.3.4","url":null,"abstract":"— Annual life history events, such as migration and spawning in fish, are often timed to match seasonal fluctuations in environmental conditions. Understanding phenological patterns and their drivers is needed to conserve vulnerable fish populations, particularly as climate change is disrupting seasonal transitions. In this study, we examined the phenology of spring spawning migrations of river herring, the alewife ( Alosa pseudoharengus ) and the blueback herring ( A. aestiva-lis ), in 4 rivers of Chesapeake Bay over 7 years (2013–2019). We used imaging sonar and weekly biological samples to estimate species-specific hourly fish counts in the Choptank River, Deer Creek (a tributary of Susquehanna River), Marshyhope Creek (a tributary of Nanticoke River), and the Patapsco River. Our results indicate that patterns of water temperature in spring drive spawning migrations at seasonal, daily, and hourly scales. The relationship between fish counts and other environmental factors, such as stream-flow, lunar phase, turbidity, wind stress, and tides, were annually inconsistent, and their influences on migrations may be river specific. For both species, distinct diel patterns in movement were observed. Migrations were diurnal in the Choptank River and Marshyhope Creek but nocturnal in Deer Creek and the Patapsco River. Observed interannual and inter-river variation in phenology and the influence of non-temperature factors on migrations highlight the need for long-term, multi-river monitoring of river herring in Chesapeake Bay.","PeriodicalId":50442,"journal":{"name":"Fishery Bulletin","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48993042","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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