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040 |aCaOODSP|beng|erda|cCaOODSP
0410 |aeng|beng|bfre
043 |an-cn-bc|apn-----
045 |ax5x8
0861 |aFs97-4/1597E-PDF|zFs97-4/1597
1001 |aHourston, A. S., |d1926- |eauthor.
24510|aStock assessments for British Columbia herring management units in 1980 and forecasts of the potential catch in 1981 / |cby A.S. Hourston.
264 1|aNanaimo, British Columbia : |bDepartment of Fisheries and Oceans, Resource Services Branch, Pacific Biological Station, |cDecember 1980.
264 4|c©1980
300 |a1 online resource (iv, 11 pages) : |bmap.
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. 1597
500 |aDigitized edition from print [produced by Department of Fisheries and Oceans].
504 |aIncludes bibliographical references (page 6).
5203 |a"The abundance of the 1980 herring run in British Columbia waters was assessed at 285,000 short tons. This was down 65,000 t from 1979, and about 15% below the average for the past decade. Most of this apparent decline may be attributed to refinements introduced into the 1980 data base and analyses which suggest that some stocks were previously overestimated. Abundance in the Central division stocks was restored from the low 1979 levels to average levels by exceptionally good recruitment in 1980. Similar recruitment levels apparently produced record runs in the Quatsino Sound and Milbanke Sound management units. An apparently large increase in abundance in the Johnstone Strait division and large decreases in the North Coast and Gulf of Georgia divisions were considered to reflect improvements in the data base and/or analysis rather than changes in abundance, although abundance was probably down slightly from 1979 in the Gulf of Georgia. Forecasts for 1981 indicate abundance levels similar to 1979 for most divisions and management units. A slight increase anticipated for the Gulf of Georgia would bring the total run up to 303,000 t. Although this would leave a potential catch of 145,000 t, much of these fish would not be available to current fisheries. Moreover, the apparently exceptional strength of the 1977 year-class in some areas in 1980 may not materialize in 1981; this should be checked by pre-fishing sampling and surveys. Meanwhile, a target catch of about 70,000 t might be considered more realistic for 1981"--Abstract, page iii.
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. 1597.|w(CaOODSP)9.505211
85640|qPDF|s614 KB|uhttps://publications.gc.ca/collections/collection_2025/mpo-dfo/fs97-4/Fs97-4-1597-eng.pdf