Abstract
Fish culture technology using double net system based on trophic level predicted can improve productivity. The aim of this research was to evaluate a fish culture technology of grouper and rabbitfish using double net system based on trophic level. This research was conducted with different stocking density. The net used was double net system. The Outer net HDPE with four cage with size of 4 × 4 × 4 m/cage and inner net HDPE with size of 3 × 3 × 3 m/cage. Inner net cage was stocked 20 grouper fish/m3 while outer net was stocked with different density of rabbit fish, 6 fish and 12 fish/m3. Each treatment was duplicated. The result showed the hybrid grouper production up to 205 kg with an individual final weight of 743 g while production of rabbit fish with stocking density 6 and 12 fish/m3 consequently was 10 kg with an individual final weight of 143 g and 15 kg with an individual final weight of 148 g. N and P content in hybrid grouper meat from feed consumed were 25% total N and 11 % total P, however 52 % of N and 74 % of P were released as faeces and excretion to the water. Rabbitfish with stocking density of 12 fish/m3 was the most effective production using double net system.
Highlights
Floating net cage aquaculture using HDPE technology (Prime grade high density polyethylene) become one of potential food production activity [1,2,3,4,5]
The purpose of the study was to evaluate the technology of hybrid grouper and rabbit fish aquaculture with a double net based on "trophic level" which is environmentally friendly
The fish were previously cultured at Institute for Mariculture Research and Fisheries Extension (IMRAFE) at Gondol, Bali
Summary
Floating net cage aquaculture (called Keramba Jaring Apung, KJA) using HDPE technology (Prime grade high density polyethylene) become one of potential food production activity [1,2,3,4,5]. Some research results report that fish culture activities in KJA which are carried out intensively are proven to produce aquaculture waste that is wasted into the aquatic environment and can significantly affect the water quality [8, 9]. Decline in the quality of the aquatic environment is the disposal of aquaculture waste during operations that contain high concentrations of organic matter and nutrients as a consequence of the inclusion of aquaculture inputs that produce untapped food residues and faeces that are dissolved in the surrounding waters [10, 11]. The purpose of the study was to evaluate the technology of hybrid grouper and rabbit fish aquaculture with a double net based on "trophic level" which is environmentally friendly
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