カセット式魚類養殖技術に関する研究 : ティラピアの長期個別飼育における水槽サイズの影響

概要

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A 154-day experiment was conducted to investigate the effect of tank sizes on the growth performance and fin damage for individual rearing of tilapia Oreochromis niloticus. Tilapia (average weight: 9.0 ± 0.6 g) were stocked individually in custom made cartridge tank of three different sizes, L-size tank: 195×145×140, M-size tank: 150×115×105, S-size tank: 105×75×70 (length×width×depth (mm)), and fed commercial extruded pellets. Fifteen fish were stocked in a 30 L water volume aquarium and reared as the control. The fish growth in S-size tank was comparable to the control during initial 14 days and lowered thereafter. Growth reduction was found after 91 days for fish reared in M-size tank. While, fish reared in L-size grew successfully and comparable to the control throughout the rearing period. The growth reduction in S and M-size tanks appeared when body length/ tank length ratio (relative value) was more than 74.4 and 86.6%, respectively. Body width, pectoral fin length and ventral fin height of the fish reared in cartridge tanks were significantly greater than those of the control (P < 0.05) at the 91 days. Fish reared in cartridge tanks had less fin damages than fish for the control tank. The result suggests that tilapia grow successfully in cartridge type tanks under controlling relative value at less than 70―90% without fin injuring and deterioration of fish quality.
生態工学会の論文
2009-10-31