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045 |ax5x8
0861 |aFs97-4/1751E-PDF|zFs97-4/1751
1001 |aHaist, V., |eauthor.
24510|aStock assessments for British Columbia herring in 1983 and forecasts of the potential catch in 1984 / |cby V. Haist and M. Stocker.
264 1|aNanaimo, British Columbia : |bDepartment of Fisheries and Oceans, Fisheries Research Branch, Pacific Biological Station, |cMarch 1984.
264 4|c©1984
300 |a1 online resource (ix, 50 pages) : |billustrations, maps.
336 |atext|btxt|2rdacontent
337 |acomputer|bc|2rdamedia
338 |aonline resource|bcr|2rdacarrier
4901 |aCanadian manuscript report of fisheries and aquatic sciences, |y0706-6473 ; |vno. 1751
500 |aDigitized edition from print [produced by Department of Fisheries and Oceans].
504 |aIncludes bibliographical references (pages 49-50).
5203 |a"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.
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 0|aPacific herring fisheries|zBritish Columbia|zPacific Coast|xForecasting.
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.
650 6|aHareng du Pacifique|xPêche commerciale|zColombie-Britannique|zPacifique, Côte du|xPrévision.
7101 |aCanada. |bDepartment of Fisheries and Oceans, |eissuing body.
7102 |aPacific Biological Station (1972- ), |eissuing body.
830#0|aCanadian manuscript report of fisheries and aquatic sciences ;|vno. 1751.|w(CaOODSP)9.505211
85640|qPDF|s1.21 MB|uhttps://publications.gc.ca/collections/collection_2025/mpo-dfo/fs97-4/Fs97-4-1751-eng.pdf