Groundfish Bottom Trawl Surveys of British Columbia Coast

Fisheries and Oceans Canada conducts long-term, coordinated synoptic bottom trawl surveys covering the continental shelf and upper slope of the British Columbia coast. The surveys provide fishery-independent abundance indices for all demersal fish species and collect biological samples using a random depth-stratified design with 2 km by 2 km sampling blocks.

Use Cases

• Calculate relative abundance indices for demersal fish species using catch and effort data from multiple survey regions.
• Analyze spatial distribution of groundfish by mapping catch data against latitude and longitude coordinates from the trawl surveys.
• Study species biology and population structure by examining associated biological data collected from survey samples.
• Compare fishery-independent abundance trends across different geographic strata like Queen Charlotte Sound and Hecate Strait.

Strengths

• Surveys cover a large geographic area spanning five distinct regions of the British Columbia coast.
• Data collection follows a standardized random depth-stratified design with defined 2 km by 2 km sampling units.
• Surveys are conducted through collaboration between a government agency (Fisheries and Oceans Canada) and an industry society (CGRCS).

Limitations

• The exact number of data rows, columns, and overall dataset size is unknown, limiting assessment of analytical scope.
• Sample data and specific column names are unavailable, making it difficult to evaluate data structure and content prior to access.
• Data is provided in HTML format, which is not ideal for direct analysis and may require parsing or conversion.

Provenance

Source

Fisheries and Oceans Canada

Collection Method

Multi-species bottom trawl surveys following a random depth-stratified design, conducted from commercial and research vessels.

Time Range

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Freshness

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Geography

Queen Charlotte Sound, Hecate Strait, West Coast Vancouver Island, West Coast Haida Gwaii, and the Strait of Georgia, British Columbia, Canada.