Integument carotenoid and astaxanthin contents of a new backcross sea bream, red sea bream female x F-1 (red sea bream female x crimson sea bream male) male - Development of new sea bream seeds by hybridization-III [Japanese]

摘要

The pigmentation of a new backcross sea bream (RF1), red sea bream Pagrus major (RSB) female x F-1 (RSB female x crimson sea bream Evynnis japonica male) male, weighing 265 g on an initial mean body weight, was compared with RSB, weighing 280 g on an initial mean body weight, by a 30-day-feeding trial. The F-1 were initially bred as a new hybrid, owing to the improvement of dark cultured-RSB pigmentation with crimson red sea bream in early 1970s. On day 15 of the feeding trial, integument carotenoid and astaxanthin contents of RF1 fed a diet with 3.0 mg astaxanthin (AS)/100 g diet were significantly higher than RSB and/or RF1 fed other diets with 0 and 1.5 mg AS/100 g diet. The integument carotenoid and AS contents of RF, and RSB rose with an increase in dietary AS amounts on the final day of the feeding trial. Moreover, the contents of RF1 tended to be higher than RSB at each dietary AS treatment. These indicate that RF1 have a preferential trait that is effectively pigmented by a shorter rearing duration with a lower AS intake than RSB.