海角社区

By Cynthia Lee, 海角社区 Newsroom

A move toward plant-based feeds alters the environmental footprint of farm-raised seafood, may change levels of healthy fatty acids in these fish

The fish-farming industry is increasing its use of plant-based ingredients in its feed and moving away from traditional feed made from fish, which could impact some of the health benefits of eating certain types of seafood, suggests a new analysis from the Johns Hopkins Center for a Livable Future (CLF) at the Johns Hopkins Bloomberg School of Public Health and 海角社区.

A large portion of the seafood consumed in North America is farmed. Fish farming, also known as aquaculture, is the fastest-growing food animal sector, outpacing the beef and poultry industries. While wild fish find their own food 鈥� which includes smaller fish for carnivorous species 鈥� intensively farmed fish are fed a manufactured aquaculture feed. Until recently, this manufactured feed was typically composed of high levels of fishmeal and fish oil derived from wild fish 鈥� but it has become unsustainable to catch more wild fish to feed growing numbers of farmed fish, so the industry has shifted the makeup of the feed. For example, twice as much soybean meal was used in commercial aquaculture feed in 2008 as compared to fishmeal, and the use of crop-based ingredients is projected to increase 124 percent between 2008 and 2020.

Impacts on human nutrition

鈥淔armed fish get their health-promoting omega-3 fatty acids, EPA and DHA, from their feed, and specifically from fish oil,鈥� says study leader Jillian Fry, PhD, director of CLF鈥檚 Public Health and Sustainable Aquaculture Project and a faculty member at the Bloomberg School. 鈥淥ur review found that increasing plant-based ingredients can change the fatty acid content in farmed fish, which can affect human nutrition.鈥�

The new study details the聽industry shift to crop-based feed ingredients, such as soy, corn, and wheat, to replace wild fish as a key ingredient in manufactured feed. The researchers鈥攊n collaboration with colleagues from the University of Minnesota鈥檚 Institute on the Environment鈥攔eviewed aquaculture and public health literature, and conducted a new analysis to estimate the environmental footprint for the top five crops used in commercial aquaculture feed.

The shift has been hailed by some as a positive change in light of the increasingly depleted oceans and the rapidly expanding aquaculture industry. But the shift may have some unintended consequences as well.

You may also like

• Droughts hit cereal crops harder since 1980s
• Walking fish reveal how our ancestors evolved onto land
• Why do some fish thrive in oil-polluted water?

Changes in fatty acid content of fish

Using vegetable oils instead of fish oil also changes the fatty acid content of fish and nutritional value for human consumption, the researchers say. Considering Americans are encouraged to consume seafood high in omega-3 fatty acids, which promote improved cardiovascular health and neurodevelopment, this has large implications for dietary recommendations and the aquaculture industry. More research is needed, they say, to better understand the impact of this shift in feed on the health benefits of consuming farmed fish.

While fish-based ingredients are seen as acutely limited, so are the resources such as land, water and fertilizer used to produce feed crops. Aquaculture鈥檚 environmental footprint likely now includes increased nutrient and pesticide runoff from the industrial crop production needed to supply fish food. This runoff is a聽key driver of water pollution globally, and can negatively impact public health. Depending on where and how feed crops are produced, plant-based fish feed could be indirectly linked to negative health outcomes for agricultural workers and nearby communities due to exposure to air, water or soil contaminated by nutrients and/or pesticides.

Implications on the environment

鈥淐urrently, only a small fraction of terrestrial agriculture is used to feed farmed fish. However, the aquaculture industry is growing rapidly. A clearer picture is needed of where and how these crop-based feed ingredients are produced so we can assess the implications of this growing industry for agriculture and the environment,鈥� says Graham MacDonald, Assistant Professor in the Department of Geography at 海角社区.

Fry says that these new findings may raise more questions than they answer.

鈥淭he nutritional content of farmed fish should be monitored,鈥� Fry says. 鈥淭he aquaculture industry should assess the environmental footprint and public health impacts of their crop-based feed ingredients and seek those produced using sustainable methods.鈥�

鈥�Environmental Health Impacts of Feeding Crops to Farmed Fish鈥� was written by , , Graham K. MacDonald, Paul C. West, Peder M. Engstrom, , and . Environment International,聽 doi:10.1016/j.envint.2016.02.022