Hydroacoustic biomass estimates of bathypelagic groundfish in Georgia Strait, January, February, and April, 1981 / by R. Kieser. : Fs97-4/1715E-PDF

"Hydroacoustic echo integration surveys were carried out in the Strait of Georgie to determine the absolute abundance and distribution of Pacific hake (Merluccius productus) and walleye pollock (Theragra chalcogramma). The prespawning and spawning periods of the target species were covered by the cruises in January, February, and April 1981. Total biomass was estimated as 67, 88, and 112 kt for the three months, respectively. Pacific hake accounted for 73, 86, and 71% of the estimates. Hake, pollock, and dogfish (Squalus acanthias) accounted for almost the entire catches that were made for species identification. The echogram and catches indicated two distinct midwater layers during all surveys. In April, a dense plankton layer was present in the shallow layer"--Abstract, page iv.

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