Strengthening sustainability in an acidified ocean: does the co-culture of seaweeds and shellfish improve shell integrity in farmed red abalone?

Project Number
Project Date Range
Focus Area(s)
Sustainable Fisheries and Aquaculture

Abalone harvesting and consumption have a long history in California, but recreational and commercial fisheries have been forced to close due to overfishing, habitat destruction, harmful algal blooms, and unseasonably warm water temperatures. Red abalone aquaculture is the only remaining commercial abalone production method in the state, but as ocean acidification impacts coastal waters, there are widespread concerns that abalone aquaculture will also be impacted. Abalone appear to be vulnerable to ocean acidification, exhibiting shell damage and reduced growth in high carbonic acid conditions.

Previous research by the Co-PI’s has shown that growing abalone together with seaweed could help reduce carbon dioxide input into the water, hence buffering the acidity of the water and improving abalone growth and shell area. However, there are still questions as to whether this system also leads to improved shell calcification, which can reduce breakage and make both the meat and shell more marketable. 

The project, in partnership with California abalone farmers, will help determine whether the co-culture of shellfish and seaweeds could be a viable solution for California’s abalone industry to adapt to and mitigate the effects of ocean acidification.

Principal Investigators
profile photo of Maya DeVries Maya DeVries
San Jose State University (San Jose State)
Co-principal Investigators
Scott Hamilton
Moss Landing Marine Laboratories / San Jose State University
Michael Graham
Moss Landing Marine Laboratories / San Jose State University