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Researchers find reducing fishmeal hinders growth of farmed fish
Date:5/3/2012

ifiable measure of how well or how poorly the different fishmeal diets were utilized.

The results showed that cobia fed the reduced fishmeal diets were metabolically different from those fed either the full fishmeal diet or the control diet. Fish fed the reduced fishmeal diets had higher levels of two metabolites linked to physical stress, tyrosine and betaine, and lower levels of a primary energy source, glucose. This suggests that these cobia were not receiving the necessary nutrition to support healthy growth.

Overall, the researchers were surprised to find that cobia on the experimental 100 percent fishmeal diet showed the most growth by the end of the 100-day study period. Along with more normal tyrosine, betaine and glucose levels, NMR spectroscopy also revealed significantly higher levels of lactate in cobia fed 100 percent fishmeal compared to fish on the other diets. This finding may be explained by the fact that the 100 percent fishmeal experimental diet has the highest percentage of the carbohydrate cornstarch, and lactate is produced by gut bacteria metabolizing carbohydrates. In turn, since efficient breakdown of carbohydrates is essential to energy production, the researchers surmise that a diet enhancing gut microflora activity might be one of the conditions needed for optimal cobia health.

Although the reduced fishmeal diets in this study did not fare well, the NIST and SCDNR researchers say that the data from the NMR-based metabolomic analysis still provide insight into what might be needed for more successful formulations. They expect that future studies will eventually lead to alternative dietary products that are more cost effective, better for the environment and lead to high yields of healthy fish.


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Contact: Michael E. Newman
michael.newman@nist.gov
301-975-3025
National Institute of Standards and Technology (NIST)
Source:Eurekalert  

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