M.N. Bautista, P.F. Subosa-1997
Aquaculture, 151: 121-129
Abstract:
Five practical shrimp diets were formulated to contain 1, 10, 20, 50,
and 100 g tetraethoxypropane (TEP)/kg diet. A diet with no added
TEP served as the control. Diets were fed to Penaeus rnonodon
(average weight 4.84 +/- 0.11 g) juveniles to determine the level of fat
oxidation tolerable to shrimp. Changes in shrimp feed quality were
monitored by physical evaluation, thiobarbituric acid (TBA) values,
fatty acid composition, and histological examination. Effects of feed
quality on growth and survival of shrimp were evaluated. Results
showed significant differences (P < 0.05) in TBA values among
treatments. Animals fed on diet 6, which contained 100 g TEP/kg
diet, showed signs of physical deterioration after 6-8 weeks. This diet
had a significantly higher TBA value (1262 mg malonaldehyde/kg
fat) than the other treatments. The unsaturated fatty acid content of
the diet decreased as its TEP content increased. Weight gains of
shrimp fed diet 5 (50 g TEP kg/ diet) and diet 6 were significantly
lower than those fed the other diets while survival was similar.
Hepatopancreatic lesions were not evident in all samples. Fat
oxidation levels expressed in terms of TBA values of up to 828 mg
mal/kg fat can be tolerated by Penaeus monodon juveniles in terms of
growth response.
(Aquaculture Department, Southern Asian Fisheries Development
Centre, Tigbauan, Iloiolo, Philippines)
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