Hydroacoustic herring survey results from Hecate Strait November 22-December 2, 1993, W.E. Ricker cruise 93HER / by P.B. McCarter, D.E. Hay, P. Withler and R. Kieser. : Fs97-4/2248E-PDF

"Pacific herring in Hecate Strait overwinter in two major areas: Browning Entrance on the mainland side of Hecate Strait and the inshore waters of Juan Perez Sound off the south-eastern Queen Charlotte Islands. We conducted an acoustic and fishing survey of these herring aggregations from November 22-December 2, 1993 aboard the research vessel, W.E. RICKER. Total echo integration biomass estimates of midwater herring were 14,000 tonnes in the Browning Entrance area and 11,000 tonnes in the Juan Perez Sound area. These and previous year's estimates provide a temporal index of abundance. The December, 1993 Browning Entrance biomass estimate was approximately the same as that of 1992. The Juan Perez Sound biomass estimate decreased sharply. Preliminary size analyses indicates poor recruitment of small (young) herring to Juan Perez Sound but small (young) herring were plentiful in Browning Entrance. Survey design and error estimation are also discussed. A compilation of 1985-1994 model based stock forecasts and acoustic survey estimates are compared with catch plus spawner estimates"--Abstract, page iii.

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