Groundfish Longline Survey Catch and Biological Data for British Columbia

Fisheries and Oceans Canada conducts standardized longline surveys covering most of British Columbia's nearshore, hard-bottom habitat to provide fishery-independent abundance indices. The coordinated surveys follow a random depth-stratified design within 2 km by 2 km sampling blocks, using baited circle hooks deployed from research and commercial vessels. Data includes catch, effort, location (latitude, longitude), and associated biological information for rockfishes and other groundfish species.

Use Cases

• Analyze catch per unit effort (CPUE) across latitude and longitude to model groundfish abundance in nearshore British Columbia.
• Map species distribution and habitat use by correlating catch data with specific depth-strata and survey block locations.
• Compare biological data like size or age between the Inside and Outside survey regions to assess population structure.
• Investigate temporal trends in rockfish abundance using long-term survey indices from alternating annual regional coverage.

Strengths

• Survey design covers most nearshore, hard-bottom habitat of coastal British Columbia, a large and ecologically significant area.
• Data collection follows a standardized, random depth-stratified design within defined 2 km by 2 km blocks, ensuring methodological consistency.
• Surveys are conducted in collaboration with industry (Pacific Halibut Management Association) for the Outside region, leveraging operational expertise.

Limitations

• Specific data volume (row count, column count) and sample data structure are not provided, complicating initial assessment of analytical scope.
• Surveys alternate annually between northern and southern regions within the Inside and Outside areas, creating biannual gaps for any single sub-region.
• Data is presented in HTML format, which may require parsing and transformation for direct use in analytical or machine learning workflows.

Provenance

Source

Fisheries and Oceans Canada (DFO), in collaboration with the Pacific Halibut Management Association for Outside surveys.

Collection Method

Standardized 'snap and swivel' longline hook gear set on the ocean floor, following a random depth-stratified design within 2 km by 2 km blocks.

Time Range

null

Freshness

null

Geography

Nearshore, hard-bottom habitat of coastal British Columbia, divided into Inside (east of Vancouver Island) and Outside (most of the BC coastline) regions, each with northern and southern sub-regions.