The role of dietarytryptophan on the growth performance and carcass synthesis and salinity stress survival of Caspian Roach (Rutilus rutilus caspicus) fingerlings

Document Type : Physiology (Animal)

Authors

Gorgan University of Agricultural Sciences and Natural Resources, Department of Fisheries, Iran

Abstract

This investigation aims to evaluate the role of dietary tryptophan on the growth performance carcass synthesis of fingerlings of Caspian Roach (Rutilus rutilus caspicus). Fingerlings (mean weight: 1.91 ±0.01 g and total length of 6.21±0.07 after adaptation were divided to 3 groups (0.25, 0.5 % of diet and one control (0%)). Mean weight and total length difference of treatments were not significant. Carcass synthesis (without head and skin) and body composition showed significant difference between treatments (p<0.05). Lipid content of body decreased significantly as tryptophan increased (p<0.05). Effect on food intake in higher vertebrata and fish is a result of tryptophan which increases serotonin levels of brain and can effect on weight gain and also can increase protein content of carcass and decrease lipid content in Roach.

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