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045 |ax5x8
0861 |aFs97-6/1365E-PDF|zFs97-6/1365E
1001 |aHaist, V., |eauthor.
24510|aStock assessments for British Columbia herring in 1984 and forecasts of the potential catch in 1985 / |cby V. Haist, M. Stocker, and J.F. Schweigert.
264 1|aNanaimo, British Columbia : |bDepartment of Fisheries and Oceans, Fisheries Research Branch, Pacific Biological Station, |cMarch 1985.
264 4|c©1985
300 |a1 online resource (ix, 53 pages) : |billustrations, maps.
336 |atext|btxt|2rdacontent
337 |acomputer|bc|2rdamedia
338 |aonline resource|bcr|2rdacarrier
4901 |aCanadian technical report of fisheries and aquatic sciences, |x0706-6457 ; |vno. 1365
500 |aDigitized edition from print [produced by Department of Fisheries and Oceans].
504 |aIncludes bibliographical references (page 53).
5203 |a"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.
546 |aIncludes abstracts in English and French.
650 0|aPacific herring|zBritish Columbia|zPacific Coast.
650 0|aPacific herring fisheries|zBritish Columbia|zPacific Coast.
650 0|aFish stock assessment|zBritish Columbia|zPacific Coast.
650 6|aHareng du Pacifique|zColombie-Britannique|zPacifique, Côte du.
650 6|aHareng du Pacifique|xPêche commerciale|zColombie-Britannique|zPacifique, Côte du.
650 6|aRessources halieutiques|xÉvaluation|zColombie-Britannique|zPacifique, Côte du.
7101 |aCanada. |bDepartment of Fisheries and Oceans, |eissuing body.
7102 |aPacific Biological Station (1972- ), |eissuing body.
830#0|aCanadian technical report of fisheries and aquatic sciences ;|vno. 1365.|w(CaOODSP)9.504449
85640|qPDF|s990 KB|uhttps://publications.gc.ca/collections/collection_2025/mpo-dfo/fs97-6/Fs97-6-1365-eng.pdf