00000nam 2200000zi 4500 9.949361 CaOODSP 20250530144035 m o d f cr mn||||||||| 250321e197903##bccab ob f000 0 eng d CaOODSP eng rda CaOODSP eng eng fre n-cn-bc pn----- x7x7 Fs97-4/1517E-PDF Fs97-4/1517 Sigmund, N. (Norman) author. Exploratory bottom trawling for sablefish southwest of Vancouver Island, 1978 / by N. Sigmund, R.J. Beamish, J. Fargo, G. Kingston and M. Stocker. Nanaimo, British Columbia : Department of Fisheries and Oceans, Fisheries and Marine Service, Resource Services Branch, Pacific Biological Station, March 1979. ©1979 1 online resource (iv, 45 pages) : illustration, map. text txt rdacontent computer c rdamedia online resource cr rdacarrier Fisheries and Marine Service manuscript report, 0701-7618 ; no. 1517 Digitized edition from print [produced by Department of Fisheries and Oceans]. Includes bibliographical references (page 8). "A moderate catch rate of 668 kg/hr of sablefish was obtained but large incidental catches of Pacific ocean perch (1521 kg/hr) and turbot (453 kg/hr) were also obtained. Because of this high incidental catch, any trawl fishing for sablefish in the study area would have to be closely monitored if catch quotas existed for any of these incidental species. The modal age for male sablefish was 6 yr and 8 yr for females. Few males older than 8 yr were found but 41% of the females were older than 8 yr. However, age determinations using the whole otolith are very difficult and it is quite probable that ages are being underestimated especially for males. Pacific ocean perch ranged in length from 22 to 49 cm and in age from 7 to 28 yr. The number of fish in each age class was similar to a sample collected in 1968 except that the modal age of this sample was 13 yr compared to a modal age of 15 yr in the 1968 sample. In a separate study it was found that ages of Pacific ocean perch may be underestimated for fish over 22 yr old, unless otolith sections are examined"--Abstract, page iii. Includes abstracts in English and French. Sablefish British Columbia Pacific Coast. Trawls and trawling British Columbia Pacific Coast. Exploratory fishing British Columbia Pacific Coast. Morue charbonnière Colombie-Britannique Pacifique, Côte du. Chalutage Colombie-Britannique Pacifique, Côte du. Pêche d'exploration Colombie-Britannique Pacifique, Côte du. Canada. Fisheries and Marine Service, issuing body. Pacific Biological Station (1972- ), issuing body. Manuscript report (Canada. Fisheries and Marine Service) no. 1517. (CaOODSP)9.924185 PDF 1.28 MB https://publications.gc.ca/collections/collection_2025/mpo-dfo/fs97-4/Fs97-4-1517-eng.pdf