Produksi benih Gurami (Osphronemus gouramy Lac.) ukuran 2 cm pada padat penebaran 20 ekor/L dengan pergantian air 75 persen, 100 persen dan 125 persen dari total volume air

Abstract

Giant gouramy Osphronemus gouramy Lac. is one of the most important fresh water fish commodities with increasing production level every year. Water quality management through a proper water exchange both in quantity and quality can be one of the alternatives to support the elevating production. This research was conducted from July to August 2010 at the Aquaculture Production Technology and Management Laboratory, Department of Aquaculture, Faculty of Fisheries and Marine Science, Bogor Agricultural University. The seed used was 0.84+0.011 cm in length and 0.017+0.001 cm in weight which reared in 9 units of aquaria with a size of 60x29x33cm3. Silk worm was used as the feed and provided daily at satiation . Water exchange was performed twice a day at a level depending on the treatment, namely 75% (50% at morning and 25% at evening), 100% (50% at morning and evening) and 125% (75% at morning and 50% at evening) of total water volume. Water exchange at 75%, 100% and 125% per day resulted in survival rates of 94.11+0.63%; 91.89+2.02%; and 93.89+0.75%; specific growth rates of 7.43+0.15 %, 8.58+0.24 %, and 9.97+0.18 %. Growth rate in length of 1.06+0.06 cm, 1.33+0.04 cm, and 1.55+0.01 cm; coefficient of variation in length of 11.31+1.43%, 9.35+1.46%, and 6.90+2.30%; feed efficiency of 12.47+0.30%, 14.32+1.05%, and 19.67+0.54%. the financial benefits resulted of the process were worth of IDR.351,903.00; IDR.402,302.00; and IDR.464,715.00; whereas R/C ratio of 1.71; 1.80; dan 1.90; BEP of 1,845 unit, 1,645 unit, and 1,517 unit; payback period (PP) of 0.97 years, 0.85 years, and 0.74 years; and the cost production as much as IDR.79.90; IDR.82.70; and IDR.82.90 per individual, respectively. The treatments were significantly different on several parameters, such as specific growth rate, length of growth rate, feed efficiency at P<0.05. The results of this experiment showed that 125% daily water exchange improved the production performance of giant gouramy seed cultured at a density of 20 fish/L. For production purpose, rearing giant gouramy fish 2 cm in size at a density of 20 fish/liter was found as the optimum condition through 125%/day water exchange.