CHANGES IN SOME PROPERTIES OF BLACK-SEA BREAM RELEASED INTO THE DAIO BAY, HIROSHIMA

In order to evaluate seed quality for release projects, body constitue nts of artificially-produced black sea bream Acanthopagrus schlegeli w ere monitored after release. The individually marked fish (42 mm in to tal length) were released into a Daio Bay of Nino-shima Island, Hirosh ima, in August 1993. The hatchery-produced fish which had high lipid r eserves lost them abruptly within one month after release. Thereafter, the lipid level became lower than that of wild fish at the 100th day. Intestinal length of hatchery-produced fish was shorter than that of wild fish, but extended to the same length to wild fish by living in t he sea. Activity of the hepatic enzyme glucose-6-phosphate dehydrogena se (EC 1.1.1.49) involved in lipogenesis was higher in hatchery-produc ed fish but reached the same level as that in wild fish at one month a fter release. Activity of hepatic 6-phosphogluconate dehydrogenase (EC 1.1.1.44) remained constant during the experimental period. The chang es in the body constituents could be helpful in evaluating fish qualit y in releasing projects.