PENDEDERAN IKAN KERAPU CANTIK (Epinephelus fuscoguttatus × Epinephelus microdon) BERBASIS RAS DAN BIOREMEDIASI UNTUK EFISIENSI AKUABISNIS

Nursery of cantik grouper is generally carried out with regular water changes every day so that it is susceptible to decreased water quality and production performance. Grouper nursery with recirculation and bioremediation systems is expected to improve production performance by improving water quality. This study aims to analyze grouper nursery based on RAS (Recirculating aquaculture system) and bioremediation to improve aquabusiness efficiency. This study was conducted for 40 days using a completely randomized design with three treatments and four replications. The study used three treatment systems, namely conventional systems without recirculation and without bioremediation (SK), recirculation systems without bioremediation (RAS), and recirculation and bioremediation systems (RB). The fish used in the research were grouper seeds with an average initial length of 3.6±0.2 cm with a stocking density of 500 fish/m3. The results showed that the best survival rate and absolute length growth rate were obtained in the recirculation system with bioremeciation of 94.8±0.37%, and 0.1098±0.0029 cm/day. Grouper nursery business with recirculation and bioremediation systems was able to increase profits by 41.76% and 8.81% more efficiently than the routine water change system.Pendederan ikan kerapu cantik umumnya dilakukan dengan pergantian air rutin setiap hari sehingga rentan terhadap penurunan kualitas air dan kinerja produksi. Pendederan ikan kerapu dengan sistem resirkulasi dan bioremediasi diharapkan dapat meningkatkan kinerja produksi melalui perbaikan kualitas air. Penelitian ini bertujuan untuk menganalisis pendederan kerapu berbasis recirculating aquaculture system (RAS) dan bioremediasi untuk meningkatkan efisiensi akuabisnis. Penelitian ini dilakukan selama 40 hari menggunakan rancangan acak lengkap dengan tiga perlakuan dan empat kali ulangan. Penelitian menggunakan tiga perlakuan sistem pemeliharaan, yaitu sistem konvensional tanpa resirkulasi dan tanpa bioremediasi (SK), sistem resirkulasi tanpa bioremediasi (RAS), serta sistem resirkulasi dan bioremediasi (RB). Ikan yang digunakan pada penelitian adalah benih kerapu cantik dengan panjang awal rata-rata 3,6±0,2 cm dengan padat tebar 500 ekor/m3. Hasil penelitian menunjukkan bahwa tingkat kelangsungan hidup dan laju pertumbuhan panjang mutlak terbaik didapatkan pada sistem resirkulasi dengan bioremesiasi sebesar 94,8±0,37%, dan 0,1098±0,0029 cm/hari. Usaha pendederan ikan kerapu dengan sistem resirkulasi dan bioremediasi mampu meningkatkan keuntungan 41,76% dan 8,81% lebih efisien dari sistem pergantian air rutin

Increasing The Stocking Density of Grouper Nurseries for Aquabusiness Efficiency in Recirculating Aquaculture System (RAS) with Bioremediation

Water quality improvement was carried out by means of recirculation and bioremediation systems in grouper nurseries with high stocking density, thereby increasing production performance. The goal of this study was to evaluate the effectiveness of aquabusiness by analyzing the rise in grouper nursery stocking density using RAS and bioremediation systems. The test parameters consist of production performance, blood glucose levels, physic-chemistry-biology of water quality, and business efficiency based on productivity and business analysis. Treatment of 1,000 fish/m3 increased survival, blood glucose levels, total bacteria, Vibrio spp., ammonia, nitrite, and all productivity parameters. But it lowers all growth parameters, pH, and dissolved oxygen values. The recirculation system with bioremediation at up to 1,000 fish/m3 of stocking boosted the profit by 2.64 times. and 14.97% more efficient than 500 fish/m3 which could not be matched by the high production performance