Sea Pen and Coral Aggregations on the Newfoundland-Labrador Shelves

Polygons identify concentrations of sea pens, gorgonian corals, and sponges on Canada's east coast. Fisheries and Oceans Canada created this dataset by analyzing research vessel by-catch data using kernel density methods across five biogeographic zones. The dataset includes latitude and longitude positions for all tows that captured these organisms, including vulnerable black coral.

Use Cases

• Mapping vulnerable marine habitat zones based on identified sea pen field polygons.
• Analyzing the spatial overlap of fishing activity and coral/sponge aggregations based on tow positions.
• Modeling species distribution for gorgonian corals based on their reported locations in the Eastern Arctic and Labrador slope.
• Identifying areas for marine protected area designation based on the concentration of large Geodia spp. sponges.
• Studying the distribution of a unique barrel-shaped sponge population (Vazella pourtalesi) on the Scotian Shelf.

Strengths

• Data is derived from spatial analysis of research vessel survey by-catch data, suggesting a systematic collection method.
• Analysis was performed for each of five biogeographic zones of eastern Canada, providing regional context.
• Includes positions for all tows capturing both aggregating and non-aggregating taxa like black coral.
• A specific 0.4 kg minimum catch weight threshold was used to define sea pen field habitat.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect geographic and methodological bias inherent to the Campelen trawl gear and survey design.

Provenance

Source

Fisheries and Oceans Canada

Collection Method

Spatial analysis of research vessel survey by-catch data using kernel density and catch weight thresholds.

Freshness

Last updated 2026-05-08 08:01:51.840273; freshness should be verified.

Geography

East coast of Canada, specifically the Newfoundland-Labrador Shelves biogeographic zone and other eastern Canadian zones.