Nippon Suisan Gakkaishi 67 (5), 838-841 (2001)

Integument Carotenoid and Astaxanthin Contents of A New Backcross Sea Bream, Red Sea Bream×F1 (Red Sea Bream×Crimson Sea Bream) —Development of New Sea Bream Seeds by Hybridization-III—

Hidemi Kumai,1 Motoji Nakamura,1a Noriaki Sakajyo,1 Osamu Takaoka,1 Shin-ichi Furuta,2 Manabu Seoka,1 Kenji Takii1

1Fisheries Laboratory, Kinki University, Wakayama 649-5145, 2Fish Nursery Center, Kinki University, Wakayama 649-5145, Japan

The pigmentation of a new backcross sea bream (RF1), red sea bream Pagrus major (RSB) ×F1 (RSB×crimson sea bream Evynnis japonica ) , weighing 265g on an initial mean body weight, was compared with RSB, weighing 280g on an initial mean body weight, by a 30-day-feeding trial. The F1 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 3.0mg astaxanthin (AS)/100g diet were significantly higher than RSB and/or RF1 fed other diets with 0 and 1.5mg AS/100g diet. The integument carotenoid and AS contents of RF1 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.

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