Putra, SukendiYurisman2012-10-292012-10-292012-10-29wahyu sari yenihttp://hdl.handle.net/123456789/300This research aim, to understand the effect of tyroxine hormone on the grwth and survival rate of motan fish (Thynnichthys thynnoides Blkr). The experiment used four treatments as following : B1 = tyroxine hormone 2 mg/kg of fish diet, B2 = tyroxine hormone 4 mg/kg of fish diet, B3 = tyroxine hormone 6 mg/kg of fish diet and B4 = tyroxine hormone 0 mg/kg of fish diet. Fishes were reared for 4 months and they were fed on fish pellet, 3 times/day. Results show that the best results was treatment B3 = tyroxine hormone 6 mg/kg of fish diet with absolute growth weight 9,23 g, daily growth rate 0,6234 %, absolute growth length 2,63 cm and survival rate 73 %.enThynnichthys thynnoidestyroxine hormoneabsolute growth weightabsolute growth lengthsurvival rateArticle