Application of an acoustic–trawl survey design to improve estimates of rockfish biomass
Biomass estimates of several species of Alaskan rockfishes exhibit large interannual variations. Because rockfishes are long lived and relatively slow growing, large, short-term shifts in population abundance are not likely. We attribute the variations in biomass estimates to the high variability in...
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ftaquaticcommons:oai:generic.eprints.org:14482 2023-05-15T18:44:39+02:00 Application of an acoustic–trawl survey design to improve estimates of rockfish biomass Hanselman, Dana H. Spencer , Paul D. McKelvey, Denise R. Martin , Michael H. 2012 application/pdf http://aquaticcommons.org/14482/ http://fishbull.noaa.gov/1104/hanselman.pdf http://aquaticcommons.org/14482/1/hanselman.pdf en eng http://aquaticcommons.org/14482/1/hanselman.pdf Hanselman, Dana H. and Spencer , Paul D. and McKelvey, Denise R. and Martin , Michael H. (2012) Application of an acoustic–trawl survey design to improve estimates of rockfish biomass. Fishery Bulletin, 110(4), pp. 379-396. Biology Ecology Fisheries Article PeerReviewed 2012 ftaquaticcommons 2020-02-27T09:26:24Z Biomass estimates of several species of Alaskan rockfishes exhibit large interannual variations. Because rockfishes are long lived and relatively slow growing, large, short-term shifts in population abundance are not likely. We attribute the variations in biomass estimates to the high variability in the spatial distribution of rockfishes that is not well accounted for by the survey design currently used. We evaluated the performance of an experimental survey design, the Trawl and Acoustic Presence/Absence Survey (TAPAS), to reduce the variability in estimated biomass for Pacific ocean perch (Sebastes alutus). Analysis of archived acoustic backscatter data produced an acoustic threshold for delineating potential areas of high (“patch”) and low (“background”) catch per unit of effort (CPUE) in real time. In 2009, we conducted a 12-day TAPAS near Yakutat, Alaska. We completed 59 trawls at 19 patch stations and 40 background stations. The design performed well logistically, and Pacific ocean perch (POP) accounted for 55% of the 31 metric tons (t) of the catch from this survey. The resulting estimates of rockfish biomass were slightly less precise than estimates from simple random sampling. This difference in precision was due to the weak relationship of CPUE to mean volume backscattering and the relatively low variability of POP CPUE encountered. When the data were re-analyzed with a higher acoustic threshold than the one used in the field study, performance was slightly better with this revised design than with the original field design. The TAPAS design could be made more effective by establishing a stronger link between acoustic backscatter and CPUE and by deriving an acoustic threshold that allows better identification of backscatter as that from the target species. Article in Journal/Newspaper Yakutat Alaska International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons Pacific |
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Open Polar |
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International Association of Aquatic and Marine Science Libraries and Information Centers (IAMSLIC): Aquatic Commons |
op_collection_id |
ftaquaticcommons |
language |
English |
topic |
Biology Ecology Fisheries |
spellingShingle |
Biology Ecology Fisheries Hanselman, Dana H. Spencer , Paul D. McKelvey, Denise R. Martin , Michael H. Application of an acoustic–trawl survey design to improve estimates of rockfish biomass |
topic_facet |
Biology Ecology Fisheries |
description |
Biomass estimates of several species of Alaskan rockfishes exhibit large interannual variations. Because rockfishes are long lived and relatively slow growing, large, short-term shifts in population abundance are not likely. We attribute the variations in biomass estimates to the high variability in the spatial distribution of rockfishes that is not well accounted for by the survey design currently used. We evaluated the performance of an experimental survey design, the Trawl and Acoustic Presence/Absence Survey (TAPAS), to reduce the variability in estimated biomass for Pacific ocean perch (Sebastes alutus). Analysis of archived acoustic backscatter data produced an acoustic threshold for delineating potential areas of high (“patch”) and low (“background”) catch per unit of effort (CPUE) in real time. In 2009, we conducted a 12-day TAPAS near Yakutat, Alaska. We completed 59 trawls at 19 patch stations and 40 background stations. The design performed well logistically, and Pacific ocean perch (POP) accounted for 55% of the 31 metric tons (t) of the catch from this survey. The resulting estimates of rockfish biomass were slightly less precise than estimates from simple random sampling. This difference in precision was due to the weak relationship of CPUE to mean volume backscattering and the relatively low variability of POP CPUE encountered. When the data were re-analyzed with a higher acoustic threshold than the one used in the field study, performance was slightly better with this revised design than with the original field design. The TAPAS design could be made more effective by establishing a stronger link between acoustic backscatter and CPUE and by deriving an acoustic threshold that allows better identification of backscatter as that from the target species. |
format |
Article in Journal/Newspaper |
author |
Hanselman, Dana H. Spencer , Paul D. McKelvey, Denise R. Martin , Michael H. |
author_facet |
Hanselman, Dana H. Spencer , Paul D. McKelvey, Denise R. Martin , Michael H. |
author_sort |
Hanselman, Dana H. |
title |
Application of an acoustic–trawl survey design to improve estimates of rockfish biomass |
title_short |
Application of an acoustic–trawl survey design to improve estimates of rockfish biomass |
title_full |
Application of an acoustic–trawl survey design to improve estimates of rockfish biomass |
title_fullStr |
Application of an acoustic–trawl survey design to improve estimates of rockfish biomass |
title_full_unstemmed |
Application of an acoustic–trawl survey design to improve estimates of rockfish biomass |
title_sort |
application of an acoustic–trawl survey design to improve estimates of rockfish biomass |
publishDate |
2012 |
url |
http://aquaticcommons.org/14482/ http://fishbull.noaa.gov/1104/hanselman.pdf http://aquaticcommons.org/14482/1/hanselman.pdf |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Yakutat Alaska |
genre_facet |
Yakutat Alaska |
op_relation |
http://aquaticcommons.org/14482/1/hanselman.pdf Hanselman, Dana H. and Spencer , Paul D. and McKelvey, Denise R. and Martin , Michael H. (2012) Application of an acoustic–trawl survey design to improve estimates of rockfish biomass. Fishery Bulletin, 110(4), pp. 379-396. |
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1766235445980561408 |