Comprehensive Global Study Confirms Restorative Aquaculture Has Positive Impacts on Marine Life

A new report from The Nature Conservancy demonstrates a growing opportunity to create a food system with environmental benefits

The comprehensive study has been published in Reviews in Aquaculture at a time when much news of food production focuses on its negative impacts on the environment. Quite to the contrary, the study titled “Habitat value of bivalve shellfish and seaweed aquaculture for fish and invertebrates: Pathways, synthesis, and next steps” paints a bright picture of aquaculture’s potential to help satisfy food demand in harmony with ocean health.

The direction (negative, neutral or positive) and magnitude of the impact of aquaculture on ecosystems is dependent on multiple interacting drivers. Note that the relative importance of each driver varies (Image: Study)

Restorative shellfish and seaweed farming offers a sustainable method to meet the nutritional needs of the growing human population, while maintaining and improving the health of the waters, lands, and animals we live alongside. This study is among the first to demonstrate the global potential for regenerative outcomes in aquaculture systems.

“Aquaculture is among the world’s fastest-growing forms of food production and there is a growing biodiversity crisis that already exists in our ocean. It’s critical that we identify ways to develop aquaculture that benefits, rather than harms our ocean, that are based on sound science,” said Robert Jones, Global Lead for Aquaculture at The Nature Conservancy. “This study is game changing in that it clearly shows an opportunity through shellfish and seaweed aquaculture. For the first time, we’re able to put quantifiable global numbers on the benefits these farms can have on marine wildlife.”

The study, a collaboration between partners at University of Melbourne, University of Adelaide, and University of New England, systematically reviewed 65 published sources around the world to assess the biodiversity benefits of mussel, oyster, clam and seaweed farms. In each case, a greater number of fish and invertebrates were observed on the farm sites compared to nearby locations. Mussel farms appear to be the most beneficial of these species groups for enhancing the volume of marine life, as about 3.6 times more fish and invertebrates appear around mussel farms compared to nearby locations.

Bivalve and seaweed aquaculture production methods and mechanisms and pathways associated with habitat value (Image:Study) | Click imge to enlarge

In addition, a greater diversity of species was also observed on some farm sites. Oyster farms proved to be the most effective for increasing species diversity; 30% more species were found to inhabit these farms than areas near the farm. These benefits were the result of providing a structured habitat, food and places to forage, and reproductive grounds for fish.

“Food production has had a significant negative impact on the natural world, including 80% of habitat loss, and aquaculture alone accounts for up to 30% of mangrove loss in some parts of Asia, which are vital nursery grounds for fish and marine life,” said Dr. Heidi Alleway, Global Aquaculture Scientist, at The Nature Conservancy. “As a result, conservation efforts have been increasingly focused on how to curb the detrimental effects of food production practices. The benefits identified in this study open an exciting conversation about how we might be able to better design – to best design – a food system that not only addresses the environmental impacts, but perhaps even supports the repair and recovery of degraded ecosystems or areas.”

“For decades we have thought these benefits may be real. It is fantastic to see these results quantify this positive habitat value from aquaculture,” said Dr. Barry Costa-Pierce, Henry L. & Grace Doherty Professor of Ocean Food Systems at University of New England.

The authors hope that policymakers at local, regional, and global levels will recognize the potential positive outcomes provided by aquaculture and begin to incorporate them into regulatory systems that encourage development of a habitat-positive industry, and that potentially create public incentives and market-based approaches that allow farmers to be rewarded or compensated for the benefits they are providing.

“When managed and practiced well, commercial, market-driven shellfish and seaweed farming can provide ecosystem services,” said Dr. Seth Theuerkauf, the study's lead author and former Global Aquaculture Scientist at The Nature Conservancy. “This means that we have another tool in the coastal ecosystem recovery toolbelt that can be deployed by the private sector to produce food while providing the ecosystem services that we so desperately need in many systems.”

More broadly, the authors hope that the example of shellfish and seaweed farming systems can provide an important case study that inspires application and development of aquaculture and agriculture that is nature-positive while also helping to provide food security.

View the full study here

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