The Strait of Georgia Ichthyoplankton Survey, 1979-1981
Citation
Fisheries and Oceans Canada ., Galbraith M (2022). The Strait of Georgia Ichthyoplankton Survey, 1979-1981. Version 1.3. Fisheries and Oceans Canada. Sampling event dataset https://doi.org/10.15468/6cqgkc accessed via GBIF.org on 2024-10-04.Description
Ichthyoplankton surveys were conducted in the Strait of Georgia (British Columbia) during 1979-1981 to ascertain the onset of fish spawning, and to explore distributional patterns and estimate total biomass of fish species. Oblique tows were made using 0.25m^2 Bongos equipped with 351 micron Nitex nets of modified SCOR design. All sampling gear was black to minimize potential avoidance and resulting catch bias. The tow procedure generally followed that established by CALCOFI. This dataset contains a compilation of corrected catches of juvenile fishes, fish eggs and fish larvae by station.Sampling Description
Study Extent
Strait of Georgia and Malaspina Strait from north of the Ballenas Islands to north of Texada Island as well as the central and southern Strait of Georgia.Sampling
All tows were made using 0.25m^2 Bongos equipped with 351 micron Nitex nets of modified SCOR design, and General Oceanics center-mounted flow meters. A 90 kg cylindrical weight was suspended from the yoke of the Bongos. All sampling gear was black to minimize potential avoidance and resulting catch bias. The tow procedure for oblique tows generally followed that established by CALCOFI: vessel speed of I m/s gear descent at a cable pay-out rate of 50 m/min, and gear ascent at a cable recovery rate of 20 m/min. Tows were made to within 20 m of the sea floor at all stations. The recovered nets were thoroughly washed down with a high-pressure deck hose and the resulting catches were preserved in 5% buffered seawater formaldehyde for processing ashore.Quality Control
In the laboratory, fish, fish eggs, and larvae, euphausiids and other selected invertebrate groups were extracted from one-net catches. The entire catches from the other net were retained in a row reference collection for future use.Method steps
- Source data was obtained, with permission, from Open Canada and Excel was used to construct an Event Core, Occurrence Core and Extended Measurement or Fact extensions. Taxon matches were obtained from WoRMS
Taxonomic Coverages
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Agonidaecommon name: poachers rank: family
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Ammodytidaecommon name: sand lances rank: family
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Stichaeidaecommon name: pricklebacks rank: family
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Cottidaecommon name: sculpins rank: family
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Pleuronectidaecommon name: righteye flounders rank: family
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Scopelarchidaecommon name: pearleyes rank: family
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Bythitidaecommon name: viviparous brotulas rank: family
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Caristiidaecommon name: manefishes rank: family
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Clupeidaecommon name: herrings rank: family
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Macrouridaecommon name: grenadiers and rattails rank: family
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Gobiidaecommon name: gobies rank: family
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Cryptacanthodidaecommon name: wrymouths rank: family
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Cyclopteridaecommon name: lumpsuckers rank: family
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Gonostomatidaecommon name: bristlemouths rank: family
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Myctophidaecommon name: lanternfishes rank: family
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Gadidaecommon name: cods rank: family
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Psychrolutidaecommon name: fathead sculpins and toadfishes rank: family
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Hexagrammidaecommon name: greenlings rank: family
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Bathylagidaecommon name: deep-sea smelts rank: family
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Liparidaecommon name: snailfishes rank: family
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Zoarcidaecommon name: eelpouts rank: family
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Merlucciidaecommon name: hakes rank: family
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Osmeridaecommon name: smelts rank: family
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Pholidaecommon name: gunnels rank: family
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Ptilichthyidaecommon name: quillfishes rank: family
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Rajidaecommon name: skates rank: family
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Rhamphocottidaecommon name: grunt sculpins rank: family
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Bathymasteridaecommon name: ronquils rank: family
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Scorpaenidaecommon name: scorpionfishes and rockfishes rank: family
Geographic Coverages
Surveys were conducted in 1979, 1980 and 1981 in the Strait of Georgia, a portion of the Salish Sea separating southern Vancouver Island from the British Columbia mainland, in British Columbia, Canada. The Strait of Georgia is connected to the Pacific Ocean through the Strait of Juan de Fuca to the south and Johnstone Strait and Queen Charlotte Strait to the northwest.
Bibliographic Citations
Contacts
. Fisheries and Oceans Canadaoriginator
Fisheries and Oceans Canada
CA
email: Moira.Galbraith@dfo-mpo.gc.ca
Moira Galbraith
metadata author
Fisheries and Oceans Canada
CA
email: Moira.Galbraith@dfo-mpo.gc.ca
Moira Galbraith
custodian steward
Fisheries and Oceans Canada
CA
email: Moira.Galbraith@dfo-mpo.gc.ca
Moira Galbraith
administrative point of contact
Fisheries and Oceans Canada
CA
email: Moira.Galbraith@dfo-mpo.gc.ca