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Impact of Seals on Declining Fish Stocks

April 5, 2018
04/05/2018

By now you have likely seen the news on the most recent DFO stock assessment of Northern Cod. The news is certainly not what we had hoped for, but it is no cause for panic. DFO Science attributed the bulk of the stock decline to natural mortality causes, including predation.

FFAW-Unifor is calling on DFO to focus more on the impacts of predation within the ecosystem, particularly grey and harp seals and their contribution to the very high natural mortality rate. An adult seal can consume as much as two tons of prey per year, a substantial portion of this being cod.

Seals are also impacting the key food source for northern cod – capelin. As you can see from the graph below, capelin consumption is driven by seals, not the commercial fishery. Seal consumption is close to 1 million tons, approximately 50 times more than the fishery.

FFAW-Unifor is echoing the Canadian Sealers Association in our support for lifting the current freeze on commercial seal licenses.

Dr. Erin Carruthers

Dr. Erin Carruthers is the Science Director and Senior Fisheries Scientist with the Fish, Food and Allied Workers Union (FFAW-Unifor), which is the labour union that represents the owner-operator fleet in Newfoundland and Labrador. The FFAW is committed to research and management that supports healthy oceans, fisheries, and coastal communities. Dr. Carruthers received her Ph. D. in Biology from Memorial University in 2011 followed by a postdoctoral fellowship with the Centre for Fisheries Ecosystems Research. Before coming to Newfoundland, Erin worked as a Research Biologist with Fisheries and Oceans Canada at the St. Andrews Biological Station. Her current research program is co-constructed with fish harvesters and includes research on coastal fishing communities, collaborative longline and trap surveys, and best practices for the avoidance, handling and release of unwanted catch.