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040 |aCaOODSP|beng|erda|cCaOODSP
0410 |aeng|beng|bfre
043 |an-cn-bc|apn-----
045 |ax8x8
0861 |aFs97-4/2135E-PDF|zFs97-4/2135E
1001 |aFargo, J., |eauthor.
24510|aSampling requirements for estimating the bycatch of Pacific halibut (Hippoglossus stenolepis) in the on-bottom trawl fishery in Hecate Strait / |cby J. Fargo, R.D. Stanley and C.M. Hand.
264 1|aNanaimo, British Columbia : |bBiological Sciences Branch, Department of Fisheries and Oceans, Pacific Biological Station, |c1991.
264 4|c©1991
300 |a1 online resource (iv, 13 pages) : |billustrations.
336 |atext|btxt|2rdacontent
337 |acomputer|bc|2rdamedia
338 |aonline resource|bcr|2rdacarrier
4901 |aCanadian manuscript report of fisheries and aquatic sciences, |y0706-6473 ; |v2135
500 |aDigitized edition from print [produced by Department of Fisheries and Oceans].
504 |aIncludes bibliographical references (page 6).
5203 |a"We investigated the precision of the bycatch estimate for halibut in the mixed species trawl fishery in Hecate Strait, derived from stratified mean CPUE. Using data collected from a 1981-82 observer program, we estimated mean CPUE for halibut and its variance for three areas of differing halibut habitat and density. From these estimates, we derived the relationship between precision of the estimate of the stratified mean CPUE and sample size (number of tows observed). Assuming that the sampling of tows is random, we found that precision of the stratified mean CPUE decreased from +50% to ±22% when the number of observations increased from 30 to 200 tows. Precision decreased to ±10% with a sample size of 850 tows. We estimate that a random sample of 20 commercial trips from this fishery, about 320 tows, of which +80% (250) could be observed, will yield an estimate of the stratified mean CPUE for halibut, for Hecate Strait, with a precision of +20% 19 times out of 20. We caution that because tows within a trip are not independent, and because we can expect considerable among trip variation, bycatch estimates based on a limited number of trips (< = 5) could be seriously biased"--Abstract, page iii.
546 |aIncludes abstracts in English and French.
650 0|aPacific halibut|xEffect of fishing on|zBritish Columbia|zHecate Strait.
650 0|aTrawls and trawling|xBycatches|zBritish Columbia|zHecate Strait.
650 0|aFisheries|xCatch effort|zBritish Columbia|zHecate Strait.
650 6|aFlétan du Pacifique|xEffets de la pêche sur|zColombie-Britannique|zHécate, Détroit d'.
650 6|aChalutage|xPrises secondaires|zColombie-Britannique|zHécate, Détroit d'.
650 6|aPêches|xMortalité par pêche|zColombie-Britannique|zHécate, Détroit d'.
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 ;|v2135.|w(CaOODSP)9.505211
85640|qPDF|s685 KB|uhttps://publications.gc.ca/collections/collection_2025/mpo-dfo/fs97-4/Fs97-4-2135-eng.pdf