Effect of dietary tryptophan supplementation on growth, body composition and digestive enzymes activity of juvenile silver pompano Trachinotus blochii (Lacepede, 1801)

Abstract

 A 60-day feeding trial was conducted to study the effect of dietary supplementation of tryptophan in juvenile silver pompano
Trachinotus blochii (Lacepede, 1801) (Average initial weight=6.81±0.05 g). Five isonitrogenous and isolipidic feeds
supplemented with tryptophan at different levels, 0 (TRP0), 0.5 (TRP0.5), 1.0 (TRP1.0), 1.5 (TRP1.5) and 2.0 (TRP2.0) g 100 g-1
of diets were formulated. The weight gain%, specific growth rate, hepato-somatic index, digestives enzymes of stomach and
intestine except protease activity in stomach, red blood cells, white blood cells, crude protein, fat and ash content of the fish
were significantly influenced (p<0.05) by tryptophan supplementation. The viscero-somatic index, intraperitoneal fat ratio,
muscle ratio, protease activity in the stomach and acid insoluble ash were unaffected by the treatment. Best observations in
terms of growth, body composition and digestive enzyme activity among the treatments were obtained in the fish group fed
with tryptophan at a level of 0.5 g 100 g-1 feed. From the current observations it can be concluded that supplementation of
tryptophan at the rate of 0.5 g 100 g-1 diet can positively influence the growth of T. blochii.

Keywords: Essential amino acids, Growth, Silver pompano, Tryptophan