Ocean acidification can harm shellfish directly and affect fisheries indirectly through changes to prey and marine food webs. The clearest documented commercial impact is on shellfish aquaculture along the North American Pacific Coast, but evidence does not establish a present-day global decline in fishing or aquaculture harvests caused by acidification alone.
How ocean acidification can affect seafood production
It makes shell-building harder for some species
As seawater absorbs carbon dioxide, its chemistry changes and fewer carbonate ions are available. Oysters, clams, scallops and other calcifying organisms use carbonate to build and maintain their shells. Acidification is a change in ocean chemistry; it does not mean the ocean has simply become acidic in the everyday sense. NOAA explains the process and its potential effects on shellfish survival, growth and physiology in its overview of ocean acidification.
Laboratory studies show that many economically and culturally important mollusks can have lower fitness, growth or survival as larvae or juveniles under tested conditions, according to the IPCC’s assessment of oceans and coastal ecosystems. These early stages matter to hatcheries that supply farms and to wild populations whose future recruitment depends on young animals surviving. A laboratory response, however, does not by itself measure how much a commercial catch will change.
It may also affect fisheries through the food web
A harvested species does not need to build a shell to be exposed to indirect effects. Changes in vulnerable prey, plankton or habitat-forming organisms could ripple through ecosystems to fish and other marine resources. NOAA Fisheries discusses potential food-web effects involving krill in its explanation of ocean acidification, while the U.S. Environmental Protection Agency’s ecosystem overview describes potential effects on prey and ecosystem services.
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These pathways are not uniform: effects depend on species and location, and acidification often occurs alongside warming, oxygen changes, fishing pressure and other stressors. That makes it difficult to attribute a change in a wild fishery to acidification alone.
Which parts of the fishing industry face the clearest risk?
Shellfish hatcheries and farms
Shellfish aquaculture is the clearest commercial example in the available evidence. The IPCC identifies substantial economic losses to shellfish aquaculture on the North American Pacific Coast during the 2000s as the clearest example of human harm from ocean acidification. NOAA’s FY2025 program update also reports documented declines and economic losses at U.S. Pacific shellfish hatcheries and other operations where waters were acidified; it says adaptation has helped reduce the threat perceived by aquaculture professionals over the past decade (NOAA Ocean Acidification Program).
Wild fisheries and other seafood businesses
Wild fisheries may face risks if prey or other parts of the ecosystem change, but that is a possible pathway rather than proof that all fish stocks are declining. NOAA has reported lower survival and slower development in a young larval stage of Dungeness crab, a commercially and culturally important West Coast species, while noting that research continues into why the effects occur and where they may be observed. That finding signals biological sensitivity; it does not establish the scale of a fishery-wide impact (NOAA’s shellfish research overview).
Exposure is also geographically uneven. NOAA identifies the Pacific Northwest and other U.S. coastal areas as regions of concern, where local conditions can compound broader ocean change (NOAA Fisheries’ Pacific Northwest research page). A local business’s risk therefore depends on the species it handles, its location and the conditions its stock encounters.
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What is documented—and what remains uncertain?
The IPCC says evidence is too limited to assess ocean acidification and deoxygenation’s present global impact on fishing and aquaculture harvests. That limitation does not erase documented regional harm: the Pacific Coast shellfish aquaculture losses are a clear case, and hatchery monitoring and other technology-based adaptations have helped minimize losses in aquaculture (IPCC, Chapter 3).
It is important to distinguish three kinds of evidence: laboratory findings show that some species and life stages are sensitive; operational reports document real impacts at particular facilities and places; and economic models estimate possible future consequences under specified scenarios. None of these supports a claim that acidification alone is causing every fish population to fall or that a particular fishery will collapse.
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What the economic estimates do—and do not—measure
A June 2024 U.S. EPA working paper modeled consumer-welfare effects for 17 shellfish types in the United States and Canada under warming-and-acidification scenarios through 2100. Its net present value estimates are not observed losses, annual losses or direct estimates of fishing-industry revenue. The paper attributes most modeled consumer-welfare effects to ocean warming, with a smaller fraction attributed to acidification. The distinction matters when using the figures to understand financial exposure.
| Consumer scope in the model | Estimated net present value | How to interpret it |
|---|---|---|
| United States | About US$11.3 billion | Modeled consumer-welfare effects from combined warming and acidification through 2100; most are attributed to warming, not acidification alone. U.S. EPA, June 2024 working paper. |
| Canada | About US$850 million | Modeled consumer-welfare effects from combined warming and acidification through 2100; most are attributed to warming, not acidification alone. U.S. EPA, June 2024 working paper. |
Consumer-welfare estimates should not be read as a prediction of grocery prices or as money that fishing businesses will necessarily lose. The study models a particular set of shellfish and climate scenarios; it does not provide a simple, acidification-only forecast for a household’s seafood bill or a local company’s revenue.
How shellfish businesses can reduce operational exposure
Adaptation can help an operator respond to local conditions, even though it does not stop the global driver of acidification. NOAA and the IPCC describe several approaches:
- Monitor hatchery water and use early warnings. Tracking conditions can help operators respond when incoming water is unfavorable. Monitoring should match the operation’s species, life stages and marine-chemistry goals.
- Use resilient strains or culture approaches where suitable. Selective breeding and resilient strains may reduce sensitivity, but effectiveness depends on the relevant stock and local conditions.
- Improve environmental monitoring for adaptive decisions. NOAA identifies enhanced monitoring as an industry priority; information is most useful when it is tied to practical operating choices.
The IPCC reports that early-warning systems and resilient strains have helped minimize aquaculture losses, while NOAA describes hatchery adaptation as an important part of the response (IPCC; NOAA Ocean Acidification Program). These are response categories, not a universal equipment recommendation: an operation must assess its species, protected life stages, water conditions, feasibility and evidence for its local stock.
What this means for seafood buyers and coastal livelihoods
For workers, fishing businesses and communities, the best-supported concern is not a uniform collapse of seafood supply but uneven exposure—particularly for shellfish operations in affected regions, plus possible knock-on effects where food webs change. For consumers, the EPA model indicates potential welfare consequences under its combined warming-and-acidification scenarios, but it does not establish a specific future price increase for seafood.
Because warming and acidification can interact, and because adaptation can reduce some operating losses without removing broader ecological risks, a single global figure cannot describe the financial outlook for every fishery or coastal community. Local species, water conditions, monitoring and the ability to adapt all matter.
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