Sea Pen and Coral Aggregations from Eastern Arctic Trawl Surveys

Eastern Canada's seafloor habitats feature concentrations of sea pens, gorgonian corals, and sponges identified through kernel density analysis of research vessel by-catch data. Fisheries and Oceans Canada produced this dataset, which provides polygon locations for dense aggregations and tow positions for non-aggregating black corals. The data was last updated on 2026-05-08.

Use Cases

• Identifying vulnerable marine ecosystems for conservation based on sea pen field polygons.
• Modeling habitat suitability for cold-water corals based on biogeographic zone distributions.
• Assessing fishing pressure impacts on long-lived species like black coral based on provided tow positions.
• Comparing benthic community structure across five eastern Canadian biogeographic zones.

Strengths

• Data delineates specific aggregations using a defined 0.25 kg minimum catch threshold for sea pens.
• Analysis covers five distinct biogeographic zones of eastern Canada.
• Includes data for both aggregating (e.g., sea pens) and non-aggregating (e.g., black coral) taxa.

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 Alfredo trawl gear sampling.

Provenance

Source

Fisheries and Oceans Canada

Collection Method

Spatial analysis of research vessel survey by-catch data using kernel density and catch weight thresholds, following a NAFO approach.

Freshness

Last updated 2026-05-08 08:01:39.282439; freshness should be verified.

Geography

Eastern Arctic biogeographic zone and other areas of eastern Canada, including the Laurentian Channel, Gulf of St. Lawrence, and Scotian Shelf.