Effect of Thyroxine Hormone on Growth and Survival Rate of Bronze Featherback (Notopterus notopterus, Pallas 1769)

Abstract

Bronze featherback (Notopterus notopterus, Pallas 1769) is an Indonesia's endemic fish that has high economic value. This study was conducted from July to August 2020 in Sungai Geringging Village, Kampar Kiri District, Riau Province to determine the effects of thyroxine (T4) on growth and survival rate of bronze featherback for 40 days. The experiment lasted for 40 days and used a completely random design with four treatments and four replications. Treatment were P1 (0 mg thyroxine/kg feed), P2 (2 mg thyroxine/kg feed), P3 (4 mg thyroxine/kg feed) and P4 (6 mg thyroxine/kg feed). The fish caught from the Kampar river were reared for 40 days in 1x1x1 m3 with five individuals. per cage. Fish treated in P4 demonstrated high growth in terms of absolute weight (10.05 ± 0.53 g), absolute length (5.27 ± 0.96 cm), daily growth rate (2.97 ± 0.22%) and larval survival rate (95 ± 10%).