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

When it comes to the food used to raise fish in aquaculture "farms," it seems that you may get what you pay for. In a new study,* researchers from the National Institute of Standards and Technology (NIST) and the South Carolina Department of Natural Resources (SCDNR) looked at the health effects of raising farmed fish on a diet incorporating less than the usual amount of fishmeala key but expensive component of current commercial fish food products. They learned that reduced fishmeal diets may be cheaper, but the fish were less healthy.

Commercial aquaculture is one of the fastest growing areas of food production, produces about $100 billion of revenue annually and accounts for nearly half of the world's food fish supply. Aquafarmers currently rely heavily on fishmeal as a protein source but it's expensive to produce and the resource from which it's derivedfish captured in the wildis being rapidly depleted. One proposed remedy is to substitute cheaper and more environmentally friendly foods that replace some fishmeal content with other sources of protein.

SCDNR designed a study to evaluate the efficacy of diets with reduced and full amounts of fishmeal fed to cobia**, a popular marine aquaculture fish, during the period when juveniles mature to adults. One diet contained 50 percent and another 75 percent less fishmeal than that found in commercial food products. A third diet contained 100 percent of the conventional fishmeal content. A fourth group of cobia ate off-the-shelf fish food as a control.

To determine whether or not the three experimental diets provided adequate nutrition for fish growth, the SCDNR teamed with NIST's nuclear magnetic resonance (NMR) spectroscopy experts at the Hollings Marine Laboratory (HML) in Charleston, S.C. NMR spectroscopy, a technique similar to magnetic resonance imaging (MRI) used by doctors, allows researchers to isolate and identify specific nutrients after the fish have metabolized thema quantifiable 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.


'/>"/>

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

Related biology news :

1. NC State researchers get to root of parasite genome
2. Researchers find animal with ability to survive climate change
3. Researchers find an essential gene for forming ears of corn
4. Researchers note differences between people and animals on calorie restriction
5. Researchers study acoustic communication in deep-sea fish
6. Researchers discover that growing up too fast may mean dying young in honey bees
7. Researchers study how pistachios may improve heart health
8. UI researchers find potentially toxic substance present in Chicago air
9. Researchers develop new self-training gene prediction program for fungi
10. Case Western Reserve University researchers track Chernobyl fallout
11. Childrens National researchers develop novel anti-tumor vaccine
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Researchers find reducing fishmeal hinders growth of farmed fish
(Date:6/22/2016)... , June 22, 2016  The American College of ... Trade Show Executive Magazine as one of the fastest-growing ... May 25-27 at the Bellagio in Las Vegas ... the highest percentage of growth in each of the following ... exhibiting companies and number of attendees. The 2015 ACMG Annual ...
(Date:6/22/2016)... , June 22, 2016 On Monday, ... call to industry to share solutions for the Biometric ... U.S. Customs and Border Protection (CBP), explains that CBP ... are departing the United States , ... and to defeat imposters. Logo - ...
(Date:6/20/2016)... DALLAS , June 20, 2016 ... criminal justice technology solutions for public safety, investigation, ... by the prisons involved, it has secured the ... Corrections (DOC) facilities for Managed Access Systems (MAS) ... (4) additional facilities to be installed by October, ...
Breaking Biology News(10 mins):
(Date:11/30/2016)... Nov. 30, 2016 Biotest Pharmaceuticals Corporation (BPC), ... to announce the addition of its newest plasma collection ... Nebraska . The 15,200 square foot state-of-the-art facility ... 2016 and brings the total number of BPC,s plasma ... Carlisle , BPC,s Chief Executive Officer said "We are ...
(Date:11/30/2016)... DIEGO and BEIJING , ... a leading commercial provider of genomic services and solutions ... announced today that it has completed a USD $75 ... Merchants Bank Co., Ltd.,s CMB International Capital Management ( ... Innovation Investment Management Co., Ltd. ("SDIC Innovation") and Shanghai ...
(Date:11/30/2016)... ... November 30, 2016 , ... SSCI, the established leader in ... implications of the latest FDA guidance on pharmaceutical cocrystals as drug substance . ... MA. , The event follows the successful November 15th event that took ...
(Date:11/30/2016)... ... November 30, 2016 , ... With growth rates averaging more than ... years and look forward to continuing their expansion in their new office space. The ... has been traditionally favoured by the creative industries, so Random42 Scientific Communication will fit ...
Breaking Biology Technology: