00000nam 2200000zi 4500 9.951543 CaOODSP 20250529125150 m o d f cr mn||||||||| 250529e198403##bccab ob f000 0 eng d CaOODSP eng rda CaOODSP eng eng fre n-cn-bc pn----- x5x8 Fs97-4/1751E-PDF Fs97-4/1751 Haist, V., author. Stock assessments for British Columbia herring in 1983 and forecasts of the potential catch in 1984 / by V. Haist and M. Stocker. Nanaimo, British Columbia : Department of Fisheries and Oceans, Fisheries Research Branch, Pacific Biological Station, March 1984. ©1984 1 online resource (ix, 50 pages) : illustrations, maps. text txt rdacontent computer c rdamedia online resource cr rdacarrier Canadian manuscript report of fisheries and aquatic sciences, 0706-6473 ; no. 1751 Digitized edition from print [produced by Department of Fisheries and Oceans]. Includes bibliographical references (pages 49-50). "Herring stock abundance in British Columbia waters was assessed for 1983, and forecasts were made for 1984 using three methods: (1) Hourston's method, (2) age-structured model analysis, and (3) surplus production model analysis. The abundance of the 1983 adult herring run in British Columbia waters assessed by Hourston's method was 344,000 tonnes. This is a decrease of 46,000 t (12%) from 1982. The 1984 run is forecast at 266,000 t with average recruitment. The 1984 forecasts for poor and good recruitment are 203,000 t and 375,000 t respectively. Average recruitment would provide a potential catch of 91,000 t. The potential catch predictions from age-structured model analysis, for 1984, do not vary greatly between the "constant" and "variable" assumptions. For the B.C. coast the catch estimates are 49,700 t and 47,900 t for the "constant" and "variable" assumptions respectively. Assuming average production the surplus production model analysis predicts a potential catch for 1984 of 162,000 t and 175,000 t for the "constant" and "variable" assumptions respectively. These unusually high catch levels result from poor model fits obtained for most of the separate stock data sets. The recommended target quota (20% of the weighted 1984 herring run size) is 61,000 t. Under conservative management and other constraints encountered administering fisheries, the catch levels recommended herein may be substantially reduced"--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. Pacific herring fisheries British Columbia Pacific Coast Forecasting. 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. Hareng du Pacifique Pêche commerciale Colombie-Britannique Pacifique, Côte du Prévision. Canada. Department of Fisheries and Oceans, issuing body. Pacific Biological Station (1972- ), issuing body. Canadian manuscript report of fisheries and aquatic sciences ; no. 1751. (CaOODSP)9.505211 PDF 1.21 MB https://publications.gc.ca/collections/collection_2025/mpo-dfo/fs97-4/Fs97-4-1751-eng.pdf