The influence of 3,3',5-triiodo- l-thyronine on growth survival and body composition of slow-growing development elvers ( Anguilla rostrata L.)

1. 1. Effect of 3,3',5-triiodo- l-thyronine (T 3) on survival, growth and body composition (protein, fat and ash) of slow-growing ( Anguilla rostrata L.) elvers was investigated. 2. 2. A significant increase was found in the mean weight of slow growing elvers receiving diets containing 20 ppm T 3 and held in the low water turnover system. 3. 3. A significant increase was also found in the weight of slow-growing elvers receiving diets containing 40 or 60 ppm T 3 and held in the high water turnover system. 4. 4. Percentage protein (dry weight basis) was significantly correlated to body weight, but was not significantly correlated to concentration of T 3 in the diet. 5. 5. There were no significant differences between the total fat content of slow-growing elvers when compared to the total body fat of control elvers.