TY - JOUR
T1 - Effect of exogenous tryptophan on cannibalism, survival and growth in juvenile grouper, Epinephelus coioides
AU - Hseu, J. R.
AU - Lu, F. I.
AU - Su, H. M.
AU - Wang, L. S.
AU - Tsai, C. L.
AU - Hwang, P. P.
N1 - Funding Information:
This study was supported by the National Science Council (National Science and Technology Program for Agricultural Biotechnology) and Academia Sinica (Major Group-Research Project), Taiwan, ROC.
PY - 2003/3/27
Y1 - 2003/3/27
N2 - Tryptophan (TRP) is a precursor of serotonin (5-HT), which is known to affect food intake and aggression in vertebrates, including fishes. The effects of TRP-supplemented diets (0.25%, 0.5% and 1% of dry diet) on growth and cannibalism were evaluated in 38-day-old juvenile groupers (200-1 tank, 750 fish per tank, 0.13 g in body weight and 2.16 cm in total length) over 10 days. HPLC analysis showed that TRP-supplemented diets were effective in increasing the levels of 5-HT in the brain of groupers. TRP supplementation resulted in slightly lower cannibalism than in controls. However, body weight and total length of TRP groups were significantly smaller than those of the control. The results indicated that cannibalism among juvenile groupers could be mitigated by the oral administration of TRP, in addition or in place of environmental factors, and the recommendation on supplementary TRP level to be used is 0.5% of dry diet.
AB - Tryptophan (TRP) is a precursor of serotonin (5-HT), which is known to affect food intake and aggression in vertebrates, including fishes. The effects of TRP-supplemented diets (0.25%, 0.5% and 1% of dry diet) on growth and cannibalism were evaluated in 38-day-old juvenile groupers (200-1 tank, 750 fish per tank, 0.13 g in body weight and 2.16 cm in total length) over 10 days. HPLC analysis showed that TRP-supplemented diets were effective in increasing the levels of 5-HT in the brain of groupers. TRP supplementation resulted in slightly lower cannibalism than in controls. However, body weight and total length of TRP groups were significantly smaller than those of the control. The results indicated that cannibalism among juvenile groupers could be mitigated by the oral administration of TRP, in addition or in place of environmental factors, and the recommendation on supplementary TRP level to be used is 0.5% of dry diet.
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U2 - 10.1016/S0044-8486(02)00503-3
DO - 10.1016/S0044-8486(02)00503-3
M3 - Article
AN - SCOPUS:0037468991
SN - 0044-8486
VL - 218
SP - 251
EP - 263
JO - Aquaculture
JF - Aquaculture
IS - 1-4
ER -