Hydroacoustic herring survey results and trawl catches from Hecate Strait, November 26 to December 12, 1985, G.B. Reed cruise GBR85E and M.V. Sunnfjord cruise SUN85-1 / by P.B. McCarter, R. Kieser, D.E....: Fs97-4/1940E-PDF

"Northern coastal waters where herring overwinter off Porcher Island and SE Moresby Island were surveyed hydroacoustically to estimate herring abundance and distribution patterns. Total midwater biomass estimates for herring were 32,000 tonnes on the northern mainland side of Hecate Strait and 9,500 tonnes off SE Moresby Island. Repeated hydroacoustic soundings over a 24-h period showed that vertical and perhaps shoreward movements of herring during dark hours resulted in lower estimates as fish moved out of the echo integration zone. During daylight hours, herring located near or on very irregular sea bottom could not be acoustically estimated because of bottom echo interference. Vessel avoidance, species compositions of trawl and bongo net catches, stomach contents and size and age distributions of herring were also examined. Oceanographic data were collected at eight hydrographic and plankton stations"--Abstract, page iii.

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