Shellfish vs Acidic Seas: Can Lobsters Help Save the Ocean 2026

Shellfish like lobsters and clams may hold the key to neutralizing ocean acidification, one of the greatest threats to marine ecosystems. As the Gulf of Maine warms faster than 99% of the world's oceans, fishermen like Scott Lord are witnessing dramatic declines in inshore lobster populations, pushing them farther offshore. Scientists at Woods Hole Oceanographic Institution are now investigating whether these creatures can help lock away carbon and restore balance to our seas.

The Threat of Ocean Acidification

Ocean acidification occurs when the ocean absorbs excess carbon dioxide from the atmosphere, leading to a drop in pH levels. This chemical change makes it harder for shellfish to build their calcium carbonate shells, threatening their survival and the entire food web. The ocean currently absorbs about 31% of atmospheric carbon, but this comes at a cost—more acidic waters disrupt marine life from the bottom up.

For coastal communities like New England, the impact is personal. The iconic lobster roll, once a humble summer treat, now fetches $30 or more as supply dwindles. Scott Lord, a third-generation lobster fisherman, has seen bycatch like sea urchins and starfish become rare, and inshore lobster numbers have plummeted over the past 15 years. “Why are there not clams where there used to be clams? Why are they not coming back, no matter what we do?” he asks.

How Shellfish Can Help

Marine carbon dioxide removal (mCDR) is an emerging field that explores ways to enhance the ocean's natural carbon sink. One promising approach involves shellfish—their shells naturally sequester carbon as they grow. When they die, their shells sink to the ocean floor, locking carbon away for centuries. Scientists like Adam Subhas at Woods Hole are leading the LOC-NESS (Locking Ocean Carbon in the North-east Shelf and Slope) initiative to study this process in the North Atlantic.

Case Study: Gulf of Maine

The Gulf of Maine is warming faster than 99% of the world's oceans, making it a critical laboratory for studying climate impacts. Fishermen like Lord have joined regional shellfish committees to understand why clam populations aren't recovering. Their observations are guiding scientists toward solutions that combine local knowledge with cutting-edge research.

Scientific Research at Woods Hole

Subhas and his team are measuring how shellfish beds influence carbon cycling. They're testing whether restoring oyster and clam reefs can enhance carbon storage while also improving water quality. Early results suggest that shellfish aquaculture could be a win-win—providing food and economic stability while mitigating ocean acidification.

Comparison: Traditional vs. Shellfish-Based Mitigation

Key Takeaways

• Ocean acidification threatens shellfish survival and coastal economies.
• Shellfish naturally sequester carbon through their shells.
• Marine carbon dioxide removal (mCDR) is a promising research area.
• Local fishermen and scientists are collaborating on solutions.
• Restoring shellfish habitats could offer a sustainable path forward.

FAQ

As the ocean warms and acidifies, the role of shellfish becomes ever more critical. By supporting research and sustainable fishing practices, we can help these creatures—and ourselves—adapt to a changing world. The answer may lie not in grand engineering schemes, but in the humble lobster and clam.

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