Hecate Strait groundfish bottom trawl survey, May 22nd to June 19th, 2007

A bottom trawl survey of Hecate Strait was conducted on the Canadian Coastguard Ship W.E. Ricker between May 22nd and June 19th, 2007. This was the second survey in what is intended to be a long-term survey series, coordinated with other area-specific surveys that together cover the continental shel...

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Hauptverfasser: Olsen, N, Rutherford, K L, Stanley, R D, Wyeth, M R
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Sprache:eng
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Zusammenfassung:A bottom trawl survey of Hecate Strait was conducted on the Canadian Coastguard Ship W.E. Ricker between May 22nd and June 19th, 2007. This was the second survey in what is intended to be a long-term survey series, coordinated with other area-specific surveys that together cover the continental shelf and upper slope of most of the British Columbia coast. The objective of these surveys is to provide fishery-independent abundance indices of all demersal fish species available to bottom trawling, as well as to collect biological samples of selected species. The survey conducted 143 successful tows from a total of 156. The mean catch per successful tow was 292 kg, averaging about 19 different species of fish and invertebrates in each. The most abundant fish species encountered was arrowtooth flounder (Atheresthes stomias) followed by spotted ratfish (Hydrolagus colliei), rex sole (Glyptocephalus zachirus), and Dover sole (Microstomas pacificus). Biological data, including individual length, weight, sex, maturity, and age structure were collected from 56 different species of fish. Oceanographic data and net geometry were also recorded for most tows, including water temperature, depth, headrope height, and doorspread.Original Abstract: Un releve au chalut de fond a ete realise, du 22 mai au 19 juin 2007, dans le detroit d'Hecate par le navire W.E. Ricker de la Garde cotiere canadienne. Il s'agit du deuxieme releve d'une serie d'echantillonnages qui se veulent a long terme et qui sont coordonnes avec d'autres echantillonnages par secteur couvrant, ensemble, le plateau continental et la partie superieure du talus de la majeure partie de la cote de la Colombie-Britannique. L'objectif de ces echantillonnages est d'etablir des indices d'abondance, independants de la peche, de toutes les especes de poissons demersaux capturables au chalut de fond et de recueillir des donnees biologiques sur les especes selectionnees. Des 156 traits de chalut realises, 143 ont ete fructueux. La prise moyenne par trait reussi pesait 292 kg. Quelque 19 especes differentes de poissons et d'invertebres ont ete prises en moyenne a chaque trait. La plie a grande bouche (Atheresthes stomias) a ete l'espece la plus abondante; venaient ensuite la chimere d'Amerique (Hydrolagus colliei), la sole royale (Glyptocephalus zachirus) et la sole a petite bouche (Microstomus pacificus). Des donnees biologiques (longueur, poids, sexe, stade de maturite et structure d'age) ont ete recueillies pour 56 espe
ISSN:0706-6473
1488-5387