Evaluation of cages dimension to the growth of giant trevally Caranx ignobilis

Abstract

Abstract Fish growth is one of the most target in aquaculture with right method of feeding, water quality and size of cages where they were held. In this study, a 70-day research was conducted to evaluate the effect of floating net cages dimension on growth and survival of trevally Caranx ignobilis in Ambon Inner Bay of Indonesia. A total of 90 juvenile trevallies with an average weight of 17.18 ± 1.9 g was randomly stocked in six floating net cages at three different sizes as treatments in replicate groups. Fish were fed 10% of total body mass with by catch fish twice a day to satiation. Length and weight were recorded, growth performance of fish were assessed in the form of Specific Growth Rate (SGR), Food Conversion Ratio (FCR) and Survival rate (SR). The result showed there were no significant different growth rate (SGR) at different treatments (p>0,05), with the highest SR = 100% and lowest FCR = 2.9 both in treatment C. It means the best dimension of fish rare in this research was at the biggest size of cage 200 × 150 × 100 cm 3.