Why Overfishing Occurs When Not Depleted
GOM/GBK exploitation (0.465) triggered the 0.464 overfishing safeguard while abundance (202M) remains well above the 143M limit.
Read Technical Breakdown →Latest assessment: ASMFC published its peer-reviewed American lobster benchmark stock assessment overview in November 2025. Read the official overview.
American Lobster Conservation
Explore lobster biology, the health of regional stocks, and how fishing and a changing ocean affect these animals and coastal communities.
The 2025 ASMFC benchmark assessment classified the Gulf of Maine/Georges Bank stock as not depleted, but experiencing overfishing. Southern New England was significantly depleted, with overfishing not occurring. Southern New England landings fell about 92% between 1997 and 2023. These are regional fishery assessments, not a species-wide extinction classification. Explore the 2025 ASMFC benchmark stock assessment.
Current stock-status statements are anchored to the Atlantic States Marine Fisheries Commission's 2025 peer-reviewed benchmark assessment.
Last updated:
2025 ASMFC Benchmark Assessment Summary
Official three-year average stock metrics (2021–2023) for Homarus americanus stock units.
| Stock Area | Depletion Status | Overfishing Status | Abundance (21-23 Avg) | Key Biological Reference Points |
|---|---|---|---|---|
| Gulf of Maine / Georges Bank (GOM/GBK) | Not depleted | Overfishing occurring | 202 million | Exploitation rate: 0.465 (threshold: 0.464). Abundance limit: 143M; target: 229M. Down 34% from 2018 peak. |
| Southern New England (SNE) | Significantly depleted | Overfishing not occurring | ~6 million | Landings collapsed 92% from 21.8M lbs (1997) to 1.7M lbs (2023). Driven by environmental pressures including warming and shell disease. |
LCMA Area Rules & Gauge Checker
Inspect legal carapace sizes, escape vents, and the verified status of the May 2025 Addendum XXXII gauge repeal across all 7 LCMAs.
Open Area Compliance Checker →Explore the Lobster Conservation Research Pillars
Lobster Conservation Fundamentals
Pillar 1: Life cycle, biology, molting, habitat, berried female protections, and vocabulary.
Lobster Stock Status & Science
Pillar 2: Gulf of Maine, Georges Bank, SNE collapse, Atlantic Canada, and hyperstability.
Lobster Climate Change & Warming
Pillar 3: Gulf of Maine rapid warming (0.84°F/dec), 20°C limits, and settlement decoupling.
Whale-Safe Lobster Gear & Ropeless
Pillar 4: Right whale entanglement risks, 1,700 lb weak rope, acoustic releases, and ALWTRP.
Sustainable Lobster Seafood Choices
Pillar 5: Fishery scorecards, Seafood Watch Avoid rationale, MSC audits, and buyer checklists.
Lobster Fisheries Management & Policy
Pillar 6: NOAA, ASMFC, State DMRs, DFO roles, Addendum XXXII, and international comparisons.
Lobster Fishing Communities
Pillar 7: Working waterfronts, bait inflation, transition financing, and rural maritime economies.
Lobster Monitoring Tech & eDNA
Pillar 8: On-demand acoustic gear, subsea virtual marking, eDNA monitoring, and AI detection.
Lobster Education & Lab Modules
Pillar 9: Classroom lesson plans, quantitative stock data labs, and academic citation guides.
Lobster Status Explorer & Data Hub
Interactive stock comparison matrix, CSV benchmark summary, and machine-readable evidence graph.
Lobster Stock Assessment Dashboard
2025 ASMFC benchmark metrics and historical exploitation models.
Lobster Regulations & LCMAs
Gauges, escape vents, V-notch mandates, and Addendum XXXII repeal details.
Popular Lobster Guides
Direct answers to the questions readers ask most, each sourced to fishery agencies and peer-reviewed science.
Blue Lobster: How Rare Is It?
Where the 1-in-2-million figure comes from and the crustacyanin genetics behind the color.
Maine Lobster Season
Year-round fishery, peak months, shedder vs hard-shell timing and monthly landings data.
Lobster vs Crayfish
Saltwater vs freshwater, size, claws and taste compared side by side.
Slipper vs Rock Lobster
Telling Scyllaridae from spiny rock lobsters by antennae, body shape and range.
American vs Spiny Lobster
Claws, range, tail meat, size limits and seasons for the two main lobster groups.
Lobster Size Limits by LCMA
Minimum and maximum gauge sizes, escape vents and V-notch rules for every management area.
Lobster Trap Tags & Trap Limits
How tags are issued, trap limits by area and how lost tags are replaced.
Where Do Lobsters Live?
Habitat, depth and range of the American lobster from Labrador to Cape Hatteras.
Frequently Asked Questions
Short answers based on the 2025 ASMFC benchmark assessment and official management sources.
What is the biological difference between American lobster and other lobsters?
The American lobster (Homarus americanus) is a large clawed decapod crustacean native to the cold Northwest Atlantic (from Labrador to North Carolina). It is biologically distinct from warm-water, clawless spiny lobsters (Palinuridae) and the European lobster (Homarus gammarus).
What did the 2025 ASMFC benchmark stock assessment determine for the Gulf of Maine?
The 2025 assessment classified the Gulf of Maine/Georges Bank (GOM/GBK) stock as not depleted, but experiencing overfishing. Average abundance (2021–2023) was estimated at 202 million lobsters, above the 143 million limit. Average exploitation was 0.465, slightly above the 0.464 threshold.
Why did the Southern New England lobster fishery collapse?
The 2025 assessment found the Southern New England stock significantly depleted and overfishing not occurring. Landings fell about 92% from 1997 to 2023. Warming, low recruitment and shell disease are among the pressures associated with the decline.
What is the status of the Addendum XXVII gauge increases after Addendum XXXII?
In May 2025, the ASMFC approved Addendum XXXII. It repealed the planned gauge size and escape vent increases in LCMAs 1, 3, and Outer Cape Cod, citing economic concerns and trade equity with Canada. Minimum gauge size in Area 1 remains at 3 1/4 inches, while mandatory trap tags and standard V-notch possession rules remain in full effect.
What is the history and academic heritage of LobsterConservation.com?
LobsterConservation.com was founded by Rhode Island commercial fisherman and Pew Marine Fellow Richard "Dick" Allen with support from The Pew Charitable Trusts. The site authored the seminal IFQ Summary Series and trap selectivity research cited in peer-reviewed journals like Marine Policy, Virginia Environmental Law Journal, and DFO Canada reports.
Join the Conservation Effort
Start with the biology, then review how interstate and federal fishery management works.