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Growth hormone could make farm fish bigger, faster to market

Synthetic growth hormones could shorten the growth time needed for farm-raised fish to reach market size. In research led by Connecticut Sea Grant scientist Thomas Chen, transgenics, or the technique of transferring DNA from one species to another, has showed promise as a method for stimulating growth hormone production. Using rainbow trout and tilapia, Chen is testing a synthetic protein to determine whether it can stimulate growth hormone production the same way a natural protein would.

Early results are promising. When Chen and his team transferred the rainbow trout growth hormone gene into common seafood species like carp, catfish and tilapia, the altered fish grew 60 to 600 percent larger. Chen also found that the application of a synthetic growth hormone-releasing peptide was successful, suggesting that the peptide, as well as the hormone itself, can stimulate growth. More studies are underway to confirm the hypothesis. The researchers are further working to find a peptide that will protect farm-raised rainbow trout and other seafood from disease, which often plagues aquaculture operations. If successful, transgenic fish may one day reach commercial aquaculture facilities and reduce both the amount of time and feed needed to grow fish to market size.


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Contact: Ben Sherman
sherman@nasw.org
202-662-7095
National Sea Grant College Program
16-Sep-2002


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