New DFO northern cod assessment model shows stock out of critical zone

The federal Department of Fisheries and Oceans has implemented a new assessment model for the 2J3KL northern cod stock that reveals the stock has been out of the critical zone since 2016.

The new model assesses long-term productivity using tagging and landing data from the last 70 years. The old model used data beginning in 1983, but research scientist Paul Regular says the model has been expanded to pull in data from as far back as 1954.

"A bunch of changes were accepted, and they helped us improve the understanding of the past trends in the stock, and also the relationship between adult cod and young cod," Regular said Wednesday.

"Overall the trends look similar, but now we have a longer-term perspective on the stock. And getting that bigger picture … is quite important for capturing, getting a better sense of how productivity has changed through time as well."

One of the biggest changes in the new model brings is the limit reference point, the line a stock must reach to go from the critical zone to the cautious zone.

The old reference point meant there had to be 800,000 tonnes of fish to hit the cautious zone. That number has now been lowered to 315,000 tonnes.

So, in essence, the number of cod in the water hasn't changed — but how the stock is assessed has, thanks to three decades of extra data.

"The new information provided us a better and more precise understanding of how productivity has changed through time, and helped us pinpoint better the point below which we fear that productivity of the stock is impaired," Regular said.

"It helps us demarcate that critical and cautious zone a little bit differently but perhaps a little bit more precisely. This was quite the important advancement."

The northern cod stock in Newfoundland and Labrador had been in the critical zone since 1991, a year before a moratorium was placed on the fishery.

The new assessment model also includes more new tools, like the integration of capelin abundance, which can be used to anticipate cod productivity and mortality rates.

It will be used in a new assessment in March. It's a stark contrast to a 2021 assessment that indicated there was a 99 per cent chance the stock was in the critical zone, Regular said.

Under the new model, there's a 71 per cent chance the stock is in the cautious zone, he added.

Fish, Food & Allied Workers union president Greg Pretty said in a press release the work done to create the new model is a positive step for the industry, and is pleased to see surveys going ahead as planned.

A statement Wednesday from the Newfoundland and Labrador government said it was pleased to play a part in developing the new model and is "cautiously optimistic" the stock will stay in the cautious zone come March.

Regular said it's unlikely the new model will apply to cod stocks in Zone 3PS, as it's a different kind of stock surveyed by different processes. That assessment is expected to begin in a couple of weeks.

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