The Atlantic cod stocks are returning, but there’s still a long way to go before a large-scale commercial fishery becomes viable again.
That’s the finding of new research by the Department of Fisheries and Oceans, which shows that cod stocks in the Northern region are on the way towards leaving the “critical” designation.
“The stock is still not up to the level that it was, say, back in the 1980s when we had a substantial fishery,” John Brattey, a cod research scientist with DFO, said in an interview with CBC Radio’s The Broadcast.
“But the basic message is the news is good, and the stock is going up quite well.”
The stock in the 2J, 3K and 3L regions has increased to an estimated 538,000 tons of fish — the highest rate since 1992.
Still, the stock only reaches 34 per cent of the level needed to escape the “critical” zone.
DFO performs stock assessments every three years, sourcing information from vessel surveys, commercial catches, tags on the cod and more.
In 2013, the stock reached about 300,000 tons in biomass. Today, it’s almost double that.
“It’s improved quite a bit since the full assessment was conducted three years ago,” says Brattey.
The increase is due to higher birth rates among cod, or what’s known as recruitment. Fish are also living longer in the northern Atlantic stock.
Some warmer water, which is correlated with better growth, is also helping, as well as an increase in capelin stocks, a key food source for cod.
Cod fish have been switching from a shrimp diet to a capelin diet, which Brattey says is good news.
“As they switch towards capelin, the growth of the fish and their condition seems to improve. They seem to do much better, because capelin is simply a much better prey for them,” Brattey said.
Remaining cautiously optimistic
Brattey said that it’s difficult to project exactly where the cod stocks will be in three years or when they will reach “healthy” levels.
He said if current projections are accurate, the stock will be between 60 and 66 per cent of healthy levels by 2018, and he remains cautiously optimistic for the future.
“There’s considerable potential for further growth, provided the cod have an adequate diet and environmental conditions remain favorable,” Brattey said.
“We feel as if we’re in a more optimistic phase for northern cod at the moment.”