00000nam 2200000zi 4500 9.950223 CaOODSP 20250530144200 m o d f cr mn||||||||| 250416e198007##bccab ob f000 0 eng d CaOODSP eng rda CaOODSP eng eng fre n-cn-bc pn----- x7x7 Fs97-4/1572E-PDF Fs97-4/1572 Taylor, F. H. C. (Frederick Henry Carlyle), 1919- author. Hydroacoustic and fishing surveys for walleye pollock in Dixon Entrance and nearby areas, July 5-23, 1978 / by F.H.C. Taylor and R. Kieser. Nanaimo, British Columbia : Department of Fisheries and Oceans, Resource Services Branch, Pacific Biological Station, July 1980. ©1980 1 online resource (iv, 73 pages) : illustrations, maps. text txt rdacontent computer c rdamedia online resource cr rdacarrier Canadian manuscript report of fisheries and aquatic sciences, 0706-6473 ; no. 1572 Digitized edition from print [produced by Department of Fisheries and Oceans]. Includes bibliographical references (pages 23-24). "The G.B. REED conducted a hydroacoustic survey of Dixon Entrance, Chatham Sound, and northern Hecate Strait from July 5-23, 1978, to determine the distribution and abundance of pelagic fish especially walleye pollock. The chartered trawler, NEMESIS, fished the same areas at the same time to determine the species composition of the midwater fish stocks and to obtain biological information on them. Walleye pollock were distributed throughout Dixon Entrance in a layer between 90 and 140 m (50-77 fm). They occurred infrequently where the water depth was less than 100 m (55 fm). About 90% of the pollock in Dixon Entrance were in midwater. Two main concentrations were located, one from Dundas Island to McIntyre Bay centered on the Two Peaks grounds, the other off Cape Chacon. The hydroacoustic estimate of midwater fish in Dixon Entrance was 15,000 t. Of this, 10,000 t were considered pollock, 2,800 t rockfish, 1,000 t herring, and 500 t eulachon. In northern Chatham Sound near Boston Islands the estimate of 1,400 t of pollock is possibly too large. In northern Hecate Strait 2,100 t of pelagic fish were located, about 60% herring, and 40% dogfish. Pollock were not encountered here in midwater but occurred in bottom trawl tows. Ages of pollock, determined from pectoral fin ray sections, ranged from 0-11 yr. Age 0 fish were found entangled in the mesh in several localities. Age 1 fish were widespread but not abundant. Ages 2 and 3 were rare. Ages 6 and 7 were the most numerous age groups. Adult age groups were not distributed evenly throughout Dixon Entrance. The age data suggest a high rate of natural mortality, and a high Brody growth coefficient. Pollock were feeding actively on zooplankton, principally euphausiids. Scars from lamprey wounds were noted on some pollock. They were more frequent on pollock caught near the surface in deep water off the Boston Island than elsewhere"--Abstract, page iii. Includes abstracts in English and French. Walleye pollock Dixon Entrance (B.C. and Alaska) Walleye pollock British Columbia Chatham Sound. Walleye pollock British Columbia Hecate Strait. Fish surveys Dixon Entrance (B.C. and Alaska) Fish surveys British Columbia Chatham Sound. Fish surveys British Columbia Hecate Strait. Goberge de l'Alaska Dixon, Détroit de (C.-B. et Alaska) Goberge de l'Alaska Colombie-Britannique Chatham, Détroit de. Goberge de l'Alaska Colombie-Britannique Hécate, Détroit d'. Inventaires ichtyologiques Dixon, Détroit de (C.-B. et Alaska) Inventaires ichtyologiques Colombie-Britannique Chatham, Détroit de. Inventaires ichtyologiques Colombie-Britannique Hécate, Détroit d'. Canada. Department of Fisheries and Oceans, issuing body. Pacific Biological Station (1972- ), issuing body. Canadian manuscript report of fisheries and aquatic sciences ; no. 1572. (CaOODSP)9.505211 PDF 1.70 MB https://publications.gc.ca/collections/collection_2025/mpo-dfo/fs97-4/Fs97-4-1572-eng.pdf