00000nam 2200000zi 4500 9.950378 CaOODSP 20250529114951 m o d f cr mn||||||||| 250423e198112##bccb ob f000 0 eng d CaOODSP eng rda CaOODSP eng eng fre n-cn-bc pn----- x5x8 Fs97-4/1631E-PDF Fs97-4/1631 Hourston, A. S., 1926- author. Stock assessments for British Columbia herring management units in 1981 and forecasts of the potential catch in 1982 / by A.S. Hourston. Nanaimo, British Columbia : Department of Fisheries and Oceans, Resource Services Branch, Pacific Biological Station, December 1981. ©1981 1 online resource (iv, 15 pages) : map. text txt rdacontent computer c rdamedia online resource cr rdacarrier Canadian manuscript report of fisheries and aquatic sciences, 0706-6473 ; no. 1631 Digitized edition from print [produced by Department of Fisheries and Oceans]. Includes bibliographical references (pages 7-8). "The abundance of the 1981 adult herring run in British Columbia waters was assessed at 328,000 t. This was up 46,000 t (16%) from 1980 and close to average for the period 1971-80 (334,000 t). Runs to the Gulf of Georgia and Queen Charlotte Islands division were up 58,000 t and 10,000 t respectively in 1981 while runs to the other 4 divisions were similar in abundance to those in 1980. However, there are some indications that the run to the Gulf of Georgia may have been overestimated in 1981. Fisheries took only 11% of the runs harvested during the 1980-81 season, but over 30% of the run was harvested in 3 of the 35 management units. The forecast for the 1981 run was 117 lower than the actual run. Forecasts for the Queen Charlotte Islands and Gulf of Georgia divisions were low by 39% and 43%, respectively, while the forecast for the West Coast of Vancouver Island division was high by 27%. Forecasts for the other 3 divisions were within 12% of the actual runs. Major discrepancies between forecasts and runs were attributed to weaknesses in the data base for 5 major management units. Forecasts of the 1981 runs to most of the 30 remaining management units were reasonably close to the runs as subsequently estimated. The 1982 run is forecast at 314,000 t with average recruitment: poor recruitment would reduce the forecast to 242,000 t and good recruitment increase it to 428,000 t. Forecasts by division and management unit are close to abundance levels for 1981. Average recruitment would provide a potential catch of 135,000 t under a moderate management policy and 80,000 t under conservative management. Other constraints encountered during recent fisheries would reduce these catch levels to 65,000 t and 42,000 t, respectively"--Abstract, page iii. 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. 1631. (CaOODSP)9.505211 PDF 569 KB https://publications.gc.ca/collections/collection_2025/mpo-dfo/fs97-4/Fs97-4-1631-eng.pdf