00000nam 2200000zi 4500 9.949270 CaOODSP 20250319135633 m o d f cr mn||||||||| 250319e198503##bccab ob f000 0 eng d CaOODSP eng rda CaOODSP eng eng fre n-cn-bc pn----- x5x8 Fs97-6/1365E-PDF Fs97-6/1365E Haist, V., author. Stock assessments for British Columbia herring in 1984 and forecasts of the potential catch in 1985 / by V. Haist, M. Stocker, and J.F. Schweigert. Nanaimo, British Columbia : Department of Fisheries and Oceans, Fisheries Research Branch, Pacific Biological Station, March 1985. ©1985 1 online resource (ix, 53 pages) : illustrations, maps. text txt rdacontent computer c rdamedia online resource cr rdacarrier Canadian technical report of fisheries and aquatic sciences, 0706-6457 ; no. 1365 Digitized edition from print [produced by Department of Fisheries and Oceans]. Includes bibliographical references (page 53). "Herring stock abundance in British Columbia waters was assessed for 1984, and forecasts were made for 1985 using three methods: (1) escapement method, (2) age-structured model analysis, and (3) surplus production model analysis. The abundance of the 1984 adult herring run in British Columbia waters as assessed by the newly developed escapement method was 148,000 tonnes. This is a decrease of 43,000 t (23%) from the 1983 estimate. The 1985 run is forecast at 211,600 t with average recruitment. The 1985 forecasts for poor and good productivity are 118,300 t and 317,100 t respectively. For the south coast particularly it is anticipated that poor productivity will prevail, due to unfavorable environmental conditions. The forecast from age-structured model analysis for 1985 is 142,000 tonnes. This predicted run size reflects the currently unfavorable conditions. Assuming poor production the surplus production model analysis predicts a run of 544,000 t. These unrealistically high run sizes result from poor model fits obtained for most of the separate stock data sets. The recommended 1985 catch level (20% of the weighted 1985 herring run size) for the B.C. coast is 34,100 t. Under conservative management and other constraints encountered administering fisheries, the catch levels recommended herein may be substantially lower"--Abstract, page iv. Includes abstracts in English and French. Pacific herring British Columbia Pacific Coast. Pacific herring fisheries British Columbia Pacific Coast. Fish stock assessment British Columbia Pacific Coast. Hareng du Pacifique Colombie-Britannique Pacifique, Côte du. Hareng du Pacifique Pêche commerciale Colombie-Britannique Pacifique, Côte du. Ressources halieutiques Évaluation Colombie-Britannique Pacifique, Côte du. Canada. Department of Fisheries and Oceans, issuing body. Pacific Biological Station (1972- ), issuing body. Canadian technical report of fisheries and aquatic sciences ; no. 1365. (CaOODSP)9.504449 PDF 990 KB https://publications.gc.ca/collections/collection_2025/mpo-dfo/fs97-6/Fs97-6-1365-eng.pdf