Why it matters
Benchmark assessments underpin status terms like depleted, overfishing, and recruitment decline. They are the documents managers lean on when deciding whether fishery rules need to change.
Benchmark Stock Assessment
A major scientific review that updates the models, indicators, and reference points used to judge lobster stock condition and fishing pressure.
Definition
A benchmark stock assessment is the deepest periodic reset of how managers evaluate the lobster resource, combining new data, new models, and updated environmental information.
Conservation impact
ASMFC’s 2025 benchmark found Gulf of Maine/Georges Bank not depleted but experiencing overfishing, with average 2021-2023 abundance at 202 million lobsters and the stock down 34 percent from its 2018 peak. Southern New England averaged only 6 million lobsters against an 18 million threshold.
Quick facts
- GOM/GBK trend
- 34% decline from 2018 peak
- Average GOM/GBK abundance
- 202 million lobsters in 2021-2023
- Average SNE abundance
- 6 million versus 18 million threshold
Related reading
The Future of Lobster Conservation: Challenges and Solutions
American lobster conservation faces a pivotal moment: the 2026 ASMFC Benchmark Stock Assessment found the Gulf of Maine/Georges Bank stock has declined 34% since 2018 and overfishing is technically occurring, while southern New England populations remain at record lows. Here is what the science says about the challenges ahead and the conservation strategies that are working.
Climate Change and Lobster Migration: How Warming Oceans Are Reshaping Populations
As the Gulf of Maine warms at three times the global ocean average, American lobster populations are undergoing dramatic geographic shifts. GMRI's 2024 data shows the region recorded its 12th-warmest year, with scientists now predicting populations will decline to early 2000s levels within 30 years. Here is what the science says.