Maine fishermen bucked yearslong, industrywide trends last year and caught more fish, a development regulators and industry members said shows the impact of COVID-19 relief funds.

Maine has long been a leader in catching groundfish, which are bottom-dwelling species of fish such as cod and flounder that are often used in seafood staples such as fish and chips. The New England groundfishing industry has been in decline for decades due in part to past overfishing of key species and difficulty rebuilding those stocks.

But Maine’s groundfishermen had a stronger year than most in 2023, according to state data released earlier this month. The catch of haddock more than doubled to more than 500,000 pounds (226,796 kilograms), and the catches of Atlantic cod, witch flounder and Atlantic halibut were all up significantly.

The increase in catch, as well as a more stable price, reflects investments the state made in critical infrastructure such as the Portland Fish Exchange, an auction house, said Patrick Keliher, the commissioner of the Maine Department of Marine Resources. The state received COVID-19 relief funds via the National Oceanic and Atmospheric Administration for that work and other improvements, he said.

Federal money also supported the Fishermen Feeding Mainers program, which buys fish to support food banks and schools.