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0410 |aeng|beng|bfre
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045 |ax8x8
0861 |aFs97-4/2029E-PDF|zFs97-4/2029E
1001 |aMatthews, K. R., |eauthor.
24510|aExploratory fishing and hydroacoustic observations of rockfish off Brooks Peninsula, Vancouver Island, from the MV Velma C and CSS John P. Tully, March 13-23, 1989 / |cby K.R. Matthews, J.R. Candy, L.J. Richards, R. Kieser, and C.M. Hand.
264 1|aNanaimo, British Columbia : |bDepartment of Fisheries and Oceans, Biological Sciences Branch, Pacific Biological Station, |cSeptember 1989.
264 4|c©1989
300 |a1 online resource (iv, 101 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. 2029
500 |aDigitized edition from print [produced by Department of Fisheries and Oceans].
504 |aIncludes bibliographical references (pages 12-13).
5203 |a"This report summarizes cruise results from two vessels operating in Brooks Bay, on the west coast of Vancouver Island, between March 13-23, 1989. The purpose of the joint survey was to describe rockfish communities on hard (untrawlable) bottom, and to compare these communities with similar communities on smooth (trawlable) bottom. In order to fish hard-bottom areas, the MV VELMA C, a chartered commercial longline vessel, deployed and retrieved sunken gillnets. Fishing was conducted in four habitat types identified by concurrent hydroacoustic observations from the CSS JOHN P. TULLY. These were: (1) smooth-bottom habitat generally within 100-200 m, (2) rough-bottom pinnacles with vertical relief of 10-20 m typically found between 95-130 m, (3) smooth plateaus adjacent to the shelf dropoff deeper than 170 m, and (4) the shelf dropoff at about 170-200 m. The distribution, diet behaviour, and biomass of fish schools in these areas was determined hydroacoustically. During the day, fish tended to concentrate near the bottom, and they became more dispersed at night. Transitions between night and day configurations occurred within 0.5 h. At least two types of fish schools were identified from echograms, one over rough-bottom pinnacles, and the second at the shelf dropoff. Catches of 55.3-78.5 fish/set and 5.3-8.3 species/set were obtained on pinnacles and deeper areas adjacent to the shelf dropoff, whereas the lowest catches (mean 23.3 fish/set and 2.3 species/set) were obtained on smooth-bottom areas. The catch was dominated by four species: lingcod Ophiodon elongatus (23.4%), bocaccio Sebastes paucispinis (18.7%), yellowtail rockfish S. flavidus (15.9%), and canary rockfish S. pinniger (15.5%)"--Abstract, page iii.
546 |aIncludes abstracts in English and French.
650 0|aSebastes|zBritish Columbia|zPacific Coast.
650 0|aSebastes populations|zBritish Columbia|zPacific Coast.
650 0|aFish surveys|zBritish Columbia|zPacific Coast.
650 0|aExploratory fishing|zBritish Columbia|zPacific Coast.
650 6|aSébastes|zColombie-Britannique|zPacifique, Côte du.
650 6|aSébastes|xPopulations|zColombie-Britannique|zPacifique, Côte du.
650 6|aInventaires ichtyologiques|zColombie-Britannique|zPacifique, Côte du.
650 6|aPêche d'exploration|zColombie-Britannique|zPacifique, Côte du.
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. 2029.|w(CaOODSP)9.505211
85640|qPDF|s2.17 MB|uhttps://publications.gc.ca/collections/collection_2025/mpo-dfo/fs97-4/Fs97-4-2029-eng.pdf