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ARS Home » Southeast Area » Stuttgart, Arkansas » Harry K. Dupree Stuttgart National Aquaculture Research Cntr » Research » Publications at this Location » Publication #146054
Title: DIETARY LIPID UTILIZATION BY JUVENILE SUMMER FLOUNDER (PARALICHTHYS DENTATUS)

Author
item Gaylord, Thomas
item SCHWARZ, MICHAEL - VIRGINIA TECH
item COOL, RYAN - VIRGINIA TECH
item JAHNCKE, MICHAEL - VIRGINIA TECH
item CRAIG, STEVEN - VIRGINIA TECH

Submitted to: Aquaculture America Conference
Publication Type: Abstract Only
Publication Acceptance Date: 10/15/2001
Publication Date: 1/27/2002
Citation: GAYLORD, T.G., SCHWARZ, M.H., COOL, R.W., JAHNCKE, M.L., CRAIG, S.R. DIETARY LIPID UTILIZATION BY JUVENILE SUMMER FLOUNDER (PARALICHTHYS DENTATUS). AQUACULTURE AMERICA CONFERENCE. 2002. p.2.

Interpretive Summary:

Technical Abstract: The ability of juvenile Summer flounder (Paralichthys dentatus) to utilize dietary lipid as energy, and its affect on weight gain and body composition has not been addressed to date. Diets were formulated to provide 55% crude protein from herring meal and casein. Herring oil was added to produce diets with total lipid levels of 8, 12, 16 and 20% total lipid while providing 3.83 kcal available energy/g dry diet, except for the diet containing 20% total lipid, which supplied 4.00 kcal available energy/ g dry diet due to the high inclusion levels for protein and lipid. An additional diet was included to reproduce currently available commercial diet formulations and provided 55% crude protein and 16% total lipid supplied solely from herring meal. Juvenile summer flounder (initial weight 23 g) were stocked into triplicate aquaria in a closed, recirculating system maintained at 20 0C and fed their respective diets for12 weeks. Fish were fed a fixed percentage of their body weight each day divided into two equal feedings. Upon termination of the study, effects of dietary lipid on weight gain, body condition indices and proximate composition were determined. Weight gain was uninfluenced by the lipid level in the diet with values ranging from 136% of initial weight in fish fed the diet containing 12% total lipid to 149% of initial weight in fish fed the diet containing 8% total lipid. Feed efficiency ratio values were similarly unaffected, ranging from 0.47-0.49. Fillet yield was unaltered as was the whole body composition of the fish. High levels of dietary lipid did increase the lipid content in the finray muscle, as fish fed the diet containing 16 and 20% dietary lipid had significantly higher lipid levels in this tissue compared with fish fed the diet containing 8% dietary lipid. No apparent protein sparing effect of lipid was observed. These data indicate that currently available commercial feeds for summer flounder may be over-formulated and show a need for further research to determine specific and accurate nutritional information for this species.