Growth of Tiger Puffer, Takifugu rubripes, at Different Salinities |
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| Authors: | Kotaro Kikuchi Takeshi Furuta Haruo Ishizuka Toshiharu Yanagawa |
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| Institution: | a Environmental Science Research Laboratory, Central Research Institute of Electric Power Industry, 1646 Abiko, Abiko, Chiba 270-1194 Japan; b Civil Engineering Research &Environmental Studies, 2567 Naegashima, Maebashi, Gunma 371-0241 Japan; c Energia Economic &Technical Research Institute, The Chugoku Electric Power Co., Inc., Higashi-Hiroshima, Hiroshima 739-0046 Japan |
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| Abstract: | Two 12‐wk rearing experiments were conducted to examine the effect of rearing salinities of 10–35 ppt on the growth of 3‐ and 170‐g‐size tiger puffer, Takifugu rubripes. Fish were reared in a closed recirculation system without introducing fresh culture water at 23 C and were fed commercial pellet diet for tiger puffer twice or three times daily to apparent satiation each, almost everyday. Growth of 3‐g‐size fish seemed to increase with decreasing salinity; however, there were no significant differences in the specific growth rate and weight gain among treatments because of differences in initial body weight. Final body weight and length of fish reared at 10 ppt were significantly higher than those for fish reared at 30 ppt although initial sizes were similar. Differences were not found for the feed efficiency (FE) and daily feed consumption. Apparent relationships were not observed between salinity and blood characteristics or proximate compositions of muscle of the cultured fish. Differing from smaller fish, growth of 170‐g‐size fish tended to decrease with decreasing salinity from 30 to 10 ppt and with increasing salinity from 30 to 35 ppt. Similar trends for FE were observed. |
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