Midwater Fish Surveys at the AFSC
نویسنده
چکیده
chalcogramma) stocks in the Bering Sea and Gulf of Alaska since 1979. As fisheries acoustic methodology has matured, acoustic research at the APSC has involved refinements in equipment and techniques. Whereas early echosounders and echo integrators were subject to the drifts associated with the use of analogue electronic circuitry and were limited by system dynamic range, modern units utilized by the APSC employ digital circuitry and are designed to have enormous dynamic range (as much as 160 dB).
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تاریخ انتشار 2004