Starvation Tolerance and Food Intake under Starved Conditions in Hatchery-Reared Juveniles of Coral Trout, Plectropomus leopardus

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This study was conducted to examine the starvation tolerance and food intake under starved conditions of hatchery-reared juveniles of coral trout, Plectropomus leopardus in the laboratory. Under starved conditions at 27.9°C (mean temp.), mean value of the number of days (n=50) up to death was 54, 91 and 85 days for coral trout of ca. 50 mm, 85 mm and 145 mm in standard length, respectively. Furthermore, the condition factor and visceral and liver weight indices of coral trout more rapidly decreased in the juveniles of a smaller body size. Therefore, the starvation tolerance of the coral trout is considered to be higher in lager sized juveniles. Juveniles in three body size groups (ca. 80 mm, 145 mm and 180 mm SL) were stocked in three tanks without feeding at 28.2°C (mean temp.), and 10 juveniles from each body size group after different starvation periods were fed with damselfish, Chromis viridis (ca. 10-77 mm in total length) . As a result, prey consumption of the coral trout increased with increasing starvation period. We consider that the low amount of prey consumption during the early starvation period is due to handling stress, which is body measurements at the beginning of each feeding experiment, and the prey consumption increases with increasing feeding demand depending on the degree of reduction of stored energy during starvation.
日本水産増殖学会の論文