00000nam 2200000zi 4500 9.957839 CaOODSP 20251201110559 m o d f cr mn||||||||| 251201t19901990bccab ob f000 0 eng d CaOODSP eng rda CaOODSP eng eng fre n-cn-bc pn----- x9x9 Fs97-4/2091E-PDF Fs97-4/2091E Leaman, B. M., 1949- author. W.E. Ricker hydroacoustic cruise to study rockfish behaviour off northern Vancouver Island, March 14-23, 1990 / by B.M. Leaman, R. Kieser, P. Withler, and R.D. Stanley. Nanaimo, British Columbia, Canada : Department of Fisheries and Oceans, Biological Sciences Branch, Pacific Biological Station, 1990. ©1990 1 online resource (iv, 63 pages) : illustrations, maps. text txt rdacontent computer c rdamedia online resource cr rdacarrier Canadian manuscript report of fisheries and aquatic sciences, 0706-6473 ; 2091 Digitized edition from print [produced by Department of Fisheries and Oceans]. Includes bibliographical references (pages 14-15). "We report preliminary results of a research cruise studying rockfish (Sebastes spp.) school structure and behaviour off Quatsino Sound, British Columbia. Diel distribution and behaviour of shelf and slope rockfishes are described, as well as the transitional pattern between nocturnal and diurnal distributions. The species studied (S. entomelas, S. proriger, S. reedi) showed restricted bathymetric ranges, whose areal extent was governed by bottom slope. Diurnal distributions were characterized by dense, bottom-oriented schools. Nocturnal distributions showed much more diffuse schools, both on-bottom and in the midwater. Transitional behaviour was completed within approximately 30 min on clear days, but was extended for up to 1 h on foggy or overcast days. The normal transition pattern was one of disaggregation of diurnal schools, followed by vertical movement. We also present brief results of observations, using a trawl surveillance sonar, of fish behaviour within the mouths of bottom and midwater trawls"--Abstract, page iii. Includes abstracts in English and French. Sebastes British Columbia Pacific Coast. Sebastes Behavior British Columbia Pacific Coast. Fish surveys British Columbia Pacific Coast. Sébastes Colombie-Britannique Pacifique, Côte du. Sébastes Mœurs et comportement Colombie-Britannique Pacifique, Côte du. Inventaires ichtyologiques Colombie-Britannique Pacifique, Côte du. Canada. Department of Fisheries and Oceans, issuing body. Pacific Biological Station (1972- ), issuing body. Canadian manuscript report of fisheries and aquatic sciences ; 2091. (CaOODSP)9.505211 PDF 2.04 MB https://publications.gc.ca/collections/collection_2025/mpo-dfo/fs97-4/Fs97-4-2091-eng.pdf