Terms of Reference

Stock Status Update of Scotian Shelf Snow Crab

Regional Science Response Process – Maritimes Region

February 24, 2021
Virtual meeting

Chairperson: Tara McIntyre

Context

Snow Crab (Chionoecetes opilio, O. Fabricius) is a subarctic species with a distribution from northern Labrador to near the Gulf of Maine. Snow Crab has been a dominant macro-invertebrate in the Scotian Shelf ecosystem since the decline of the groundfish during the late 1980s to early 1990s.  They are observed in large numbers in deep, soft-bottom substrates ranging from 60-280 m water depths and at temperatures generally less than 6 °C. Scotian Shelf Snow Crab are in the southern-most extreme of its spatial distribution in the Northwest Atlantic.

The Snow Crab fishery on the Scotian Shelf has been in existence since the early 1970s. It occurs annually throughout the year dependent upon the Crab Fishing Area (CFA).  In 2005, many CFAs and subareas were merged with the resulting divisions being North-Eastern Nova Scotia (N-ENS; formerly CFAs 20-22), South-Eastern Nova Scotia, S-ENS; formerly CFAs 23, 24), and Northwest Atlantic Fisheries Organization (NAFO) Area 4X.

In support of the fishery, Fisheries and Oceans Canada (DFO) Maritimes Fisheries Management Branch requested that DFO Science Branch provide an update of the stock status of the resource for the coming fishing season.  The last Snow Crab assessment Science Advisory Meeting was completed in February 2020.

Objectives

The objectives of this science advisory meeting are:

• Report on overall status of the Eastern Nova Scotia and 4X Snow Crab stocks as of the end of the 2020 season.
• Report on relative abundance after the 2020 season and relative exploitation rates during 2020 fishing season.
• Report on the bycatch of non-target species in the Snow Crab fishery in 2020 and identify any notable changes in the occurrence of these bycatch species relative to previous years.

Expected Publications

• Science Response

Expected Participation

• DFO Science
• DFO Resource Management