Pengaruh Kepadatan Yang Berbeda Terhadap Kelulushidupan Dan Pertumbuhan Ikan Nila (Oreochromis Niloticus) Pada Sistem Resirkulasi Dengan Filter Zeolit

Tilapia (Oreochromis niloticus) is a freshwater fish which have important economic value, easy to cultivate, good taste, inexpensive and have higher tolerance in different enviroment. Increased density until maximum carrying capacity will decrease growth of fish. The incrase in density will be followed by an increase in the amount of feed, wasted metabolism, oxygen consumption and can decrease water quality. Decline in water quality will result in slow growth and mortality. The purpose of this research was to explore the influence of different density and the best quantity for survival rate and growth of Tilapia (O. niloticus) in resirculation system with Zeolit filter and knowning the effetiveness of zeolite filter on resirculation system. This research used different density of Tilapia (O. niloticus ) size 4-6 cm. Eksperimental reserch conducted use. RAL (completely randomize design) with 3 treatmens and 3 replication. Treatment A (10 density of fish), Treatment B (15 density of fish) and Treatment C (20 density of fish). Data obtaired are to absolute long growth, rate of absolute specifics length, find ammonia levels, survival rate, feeding efficiency, and water quality parameters. The result showed that different density has significant effect towards the growth Tilapia but not for survival rate. The survival rate for each treatment was A = 86,67±5,77 %, B = 84,44±3,85 %, and C = 78,33±2,89 %. Rate of absolute specifics length in Tilapia at the highest treatment was A = 3,53±0,06 cm, and C = 2,57±0,06 cm. The average of specific growth rate on Tilapia was A treatment with highest of 2,45 0,07%/day, and the lowest is reatment C = 1,76 ±0,05%/day. The effectiveness of the treatment of a zeolite filter can word to the limit of the study. Compared with treatment B and C, which only reached day 20

Pengaruh Kepadatan Yang Berbeda Terhadap Kelulushidupan Dan Pertumbuhan Ikan Nila (Oreochromis Niloticus) Pada Sistem Resirkulasi Dengan Filter Bioball

Aquaculture production process have started to use intensive systems, with high stocking density and minimum water USAge. High density may become dangerous for the survival of fish, inhibits the growth of fish and water quality. This research was carried out to know the effect of different density on survival rates and growth of Tilapia (Oreochromis niloticus) in the recirculation system using bioball filter. This research was performed at the Laboratory of Fisheries building, Faculty of Fisheries and Marine Science, Diponegoro University, Semarang. And conducted for 42 days from August to October 2012. The research used 9 containers size 18 liters buckets, each bucket's filled with 10 liters of water and flowed by filter bucket. Experimental fish was tilapia with an average initial weight of 2.9 g/fish. The research used completely randomized design with 3 treatment (density of 10, 15 and 20 fishes) and three replications. Feed used in the form of commercial feed given 3% of the biomass. The results showed that density has no significant effect on survival rate, but it shows a highly significant effect towards absolute gowth and specific gowth rate. Best density is 10 fishes with an average absolute gowth of 8.77 g, and the specific gowth rate of 3.268%/days. Use filters bioball for ammonia recirculation system can reduce the density of 20 fishes up to the sixth week of the experiment