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Hydroacoustic Survey of Rockfish Abundance and Distribution Operational Plan for the Westward Region

Philip Tschersich

出版	Alaska Department of Fish and Game, Division of Sport Fish, Research and Technical Services, 2011
URL	http://books.google.com.hk/books?id=Yet7ygAACAAJ&hl=&source=gbs_api

註釋

This report specifies the methods and procedures for conducting a coastal hydroacoustic survey in the Kodiak Management Area for rockfish population size and distribution. Survey locations of probable black rockfish Sebastes melanops habitat are identified using commercial rockfish harvest logbook information, local knowledge from sport fishing charter operators and commercial jig fishermen, and bathymetric/bottom-type information from nautical charts. The survey uses a split-beam hydroacoustic transducer to locate and record individual fish acoustic signatures in the study areas. An underwater video camera is used to record images of fish in the study areas for later species identification. Mechanical jig machines and hand-held rod and reel are used to live-capture fish samples at the study areas to determine species, sex, length, and reproductive status.