Effect of various dietary
lipid levels on quantitative essential fatty acid requirements of juvenile
Pacific white shrimp Litopenaeus vannamei
M.L. Gonzalez-Felix, D.M. Gatlin, A.L. Lawrence, M.
Perez-Velazquez-2002
Journal of the World Aquaculture Society, 33(3):
330-340 (from Current Contents)
Abstract:
A 6-wk feeding trial was conducted to evaluate the
effect of various dietary lipid levels on quantitative requirements for
essential fatty acids (EFA) by juvenile Pacific white shrimp Litopenaeus
vannamei. A factorial experiment with three dietary lipid levels (3, 6, and
9%) and three dietary levels (0.5, 1, and 2%) of a mixture of n-3 highly
unsaturated fatty acids (HUFA) was used. An increase in quantitative
requirements for EFA with increasing supplementation level of dietary lipid
was not demonstrated. Results suggested that this shrimp species appeared to
be able to satisfy its n-3 HUFA requirements when they were supplied at 0.5%
of diet; this dietary level may be even lowered. Moreover, depressed growth
was observed in shrimp fed diets with the HUFA mixture supplemented at 2%.
In addition, the present study showed that increasing the dietary lipid
level had an effect on lipid composition of shrimp, by increasing lipid
deposition in hepatopancreas and muscle tissue, but without a significant
effect on growth.
(Texas A&M Univ Syst; Shrimp Mariculture Project;
1300 Port St; Port Aransas; TX 78373; USA)