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040 |aCaOODSP|beng|erda|cCaOODSP
0410 |aeng|beng|bfre
043 |an-cn-bc|apn-----
045 |ax8x8
0861 |aFs97-4/1798E-PDF|zFs97-4/1798E
1001 |aHaegele, C. W., |eauthor.
24510|aHerring stock estimate from a diving survey of spawn in Barkley Sound in 1982, with comparisons to other estimates / |cby C.W. Haegele and J.F. Schweigert.
264 1|aNanaimo, British Columbia : |bDepartment of Fisheries and Oceans, Fisheries Research Branch, Pacific Biological Station, |cDecember 1984.
264 4|c©1984
300 |a1 online resource (iv, 33 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. 1798
500 |aDigitized edition from print [produced by Department of Fisheries and Oceans].
504 |aIncludes bibliographical references (pages 7-8).
5203 |a"Divers surveyed and sampled herring spawns in Barkley Sound on the west coast of Vancouver Island, B.C. in 1982 to determine the distribution of spawn and to estimate the biomass of herring and compare the results to other estimates. Although spawn was deposited to 14 m below Chart Datum, only 10% of spawn was lower than 4 m below Chart Datum. The diving survey estimated 23,500 tonnes of herring in Barkley Sound, of which 14,300 tonnes spawned in a first wave, 5500 tonnes spawned in a second wave, and 3600 tonnes were caught in fisheries between the two waves. Estimates from population models ranged from 7352 to 25,838 tonnes, depending on which assumptions were used. Generally they underestimated stocks, probably because Fishery Officer spawn survey data, used in all the models, considerably underestimated the area of spawn. Hydroacoustic estimates of biomass were slightly lower and echosounder estimates missed completely the build-up of stocks prior to spawning"--Abstract, page iii.
546 |aIncludes abstracts in English and French.
650 0|aPacific herring|zBritish Columbia|zBarkley Sound.
650 0|aPacific herring|xEggs|zBritish Columbia|zBarkley Sound.
650 0|aFish populations|xEstimates|zBritish Columbia|zBarkley Sound.
650 6|aHareng du Pacifique|zColombie-Britannique|zBarkley, Baie.
650 6|aHareng du Pacifique|xŒufs|zColombie-Britannique|zBarkley, Baie.
650 6|aPoissons|xPopulations|xEstimation|zColombie-Britannique|zBarkley, Baie.
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. 1798.|w(CaOODSP)9.505211
85640|qPDF|s959 KB|uhttps://publications.gc.ca/collections/collection_2025/mpo-dfo/fs97-4/Fs97-4-1798-eng.pdf