Relationship between Water Quality and Growth of Tilapia, Oreochromis niloticus, under the Recirculating Filter Tank System.

TAKEUCHI Toshio, HIROTA Tetsuya, YOSHIZAKI Goro, SAKAI Kiyoshi

doi:10.11233/aquaculturesci1953.46.547

This experiment was conducted to examine the relationship between the growth performance of tilapia, Oyeochromis niloticus, and the water qualities indicated by ammonium nitrogen, nitrite nitrogen, nitrate nitrogen, etc. Fish weighing 8.6g (total length, 62.8mm) were cultured in recirculating filter tank systems (30 l) with four kinds of filter beds (Bio α, Siporax and Zeolite, all three with coral sands; and an additional Bio α bed without the coral sands) for 70 days at 28°C. During the feeding period, the water quality and feed performance were monitored. The average daily recirculation rate was 98.4% for all the four tank systems. The use of coral sand helped in stabilizing the pH values of the systems during the feeding experiment. All the three types of filter beds with coral sand were effective in nitrifying the ammonia which was excreted from the fish, while the ammonium nitrogen concentration increased to 80.9 mg/ l and pH values decreased to 4.7 in the system without coral sand. However, the tilapia exhibited good growth and high feed efficiency even though the concentrations of ammonium nitrogen or nitrate nitrogen reached 80.9 mg/l or 616 mg/l respectively at the end of feeding experiment. These results demonstrate that tilapia is highly tolerant to adverse water quality and could sustain its growth under such conditions.

Relationship between Water Quality and Growth of Tilapia, Oreochromis niloticus, under the Recirculating Filter Tank System.

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