APLIKASI TEKNOLOGI BIOFLOK (BFT) PADA KULTUR IKAN NILA, ORECHROMIS NILOTICUS)
ABSTRACT: This study was aimed
to find out the growth rate of Nile Tilapia (Oreochromis niloticus) cultured
with biofloc technology, and to understand the dynamic of several water quality
parameters during culture period. This experiment was conducted in the
Laboratory of Aquaculture Technology, FPIK, UNSRAT. Several substances were added to stimulate
the development of biofloc, which were: 0,3 mL of EM-4 containing
probiotic-bacteria Lactobacillus casei dan Saccharomyces cerevisiae.; 15 mL of
mollases; 0,5 g of yeast commonly used to ferment soybean ; 12 g
of dolomite. 60 seeds of nile tilapia,
with an individual weight of 6 g, were stocked in each container. Fish were fed at a dose of 3% of the total
biomass/day at the first week, and the dose was decreased down to 1% of the total biomass per day
afterwards. Fish were weighed at day-1,
day-15 and day-30. The change of water
color and the density of the floc was consistently evaluated using imhoff-cone.
The initial weight of the tested individual fish were 6,00 g. After 15 days,
the weight was increased to 7,37g, and at the end of the experiment the
individual fish weighed 11,47 g. Hence, the absolut growth of the tested fish
was 5,47g, the specific growth rate was
91% and the daily growth rate was 2,11%.
The density of flok reached 9,5 mL/L at the beginning of the second
week, which was categorized as very high density. The density of floc then was decreased to 4
mL/L. The density of the floc was
maintained around 5 mL/L during the experiment. The temperature of the medium
was at the range of 26-300C. The level
of ammonia was 0,03mg/L and the level
of nitrite fluctuated between
0,15-3mg/L, which is normal and safe for biofloc system. The level of nitrate was 4-55 mg/L, which was
quite high for biofloc system but not harmful for fish.
Penulis: Frandy Ombong, Indra
R.N Salindeho
Kode Jurnal: jpperikanandd160091
