Ethanol Co-Products Could Lower Cost of Freshwater Fish Production
Add this to the list of ethanol's potential benefits: lowering the cost of fish production.
Fish feed is a major expense for many aquaculture operations. New research by Agricultural Research Service (ARS) scientists shows that ethanol co-products can provide protein for fish feeds at a lower cost than the soybean-corn c
The recent proliferation of ethanol processing facilities has led to a surplus of distiller's dried grains with solubles, or DDGS—a nutrient-rich processing co-product that is often used to feed livestock.
DDGS is relatively protein-rich and lacks s
In the ARS Aquatic Animal Health Research Unit at
The scientists gave the fish feeds that included 0, 10, 20, 30 or 40 percent DDGS. All five feeds had similar levels of energy, protein and fat. Results showed that tilapia thrive on feed with up to 20 percent DDGS. Adding supplemental lysine to the feed increased that percentage to 40 percent.
The scientists found that catfish thrived on feed c
Surviving catfish raised on a diet without DDGS had fewer antibodies than those raised on the DDGS feed—particularly fish on the 20 percent DDGS diet, whose antibodies were significantly higher than those of the control fish.
This work has potential econ
ARS is the chief scientific research agency of the U.S. Department of Agriculture.