Rearing of Spotted Parrot Fish Oplegnathus punctatus to Market Size in Chichi-jima, Ogasawara Islands, Southern Japan

概要

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Growth, Survival and feed conversion of spotted parrot fish<I>Oplegnathus punctatus</I>under rearing condition were examined to assess the feasibility of aquaculture of this species in Chichi-jima, one of the Ogasawara Islands. Fish were reared for 254 days starting from 68 days after hatching (June 2003) until 321 days after hatching (March 2004) . During the rearing period, water temperatures ranged from 20.3°C to 29.6°C (mean 25.3°C) . These fishes were fed formula feed for red sea bream once or twice a day. Survival rate during the rearing period was 94.0%. Total length and body weight at 321 days after hatching were 26.8±1.5 cm and 659±106 g, respectively. Daily feed uptake and growth rates decreased during the rearing period. Feed conversion during the rearing period was 1.67 and to gain 1 kg body weight, about 362 yen per kg of fish in formula feed was required. These results suggest that spotted parrot fish can reach the market size within 1 year from hatching with excellent cost performance and therefore, it is a promising candidate for aquaculture in Chichi-jima.
日本水産増殖学会の論文