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Annual Report: Fall 2018 Bottomfish Fishery-Independent Survey in Hawaii (BFISH)
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2020
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Series: Administrative report H ; 20-01
[PDF-1.90 MB]
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Description:The Bottomfish Fishery-Independent Survey in Hawai‘i (BFISH) is designed to provide estimates of population abundance and biomass of the main Hawaiian islands Deep 7 bottomfish complex that complement and enhance the stock assessment process at the Pacific Islands Fisheries Science Center (PIFSC). The 2018 BFISH survey, comprising 461 primary sampling units (PSU), was conducted from August to November at depths ranging from 75 to 400 m across the eight main Hawaiian Islands. Sampling operations included cooperative research fishing as well as the MOUSS camera system. Kalekale was most abundant, followed by ōpakapaka and ehu. Opakapaka had the highest exploited stock biomass followed by kalekale and ehu. Estimated biomass of ōpakapaka and onaga was approximately 1.529 and 0.422 million kg, respectively. Ehu stock biomass was about 0.654 million kg. Coefficients of variation (CV%) for exploited stock biomass ranged from 26.26 to 29.14 for ehu and ōpakapaka, the two main design species. To improve BFISH precision, future research will focus on (1) refining PSU classification with respect to habitat characteristics (e.g. seafloor hardness and complexity); (2) targeted allocation that better reflects the depth preferences of the design species; and (3) technological innovations that better define the unit sampled area.
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Rights Information:Public Domain
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