Growth, External Morphology, and Resistance to Environmental Stress of Hybrid Red Sea Bream, Pagrus major*Black Sea Bream, Acanthopagrus schlegeli.

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  • 交雑魚マダイ×クロダイの成長，外部形態および環境ストレス耐性

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Abstract

This study compared the growth, survival, external morphology, and resistance to environmental stress of the hybrids of red sea bream, Pagrus major (_??_) and black sea bream, Acanthopagrus schlegeli (_??_) with the pure breeds. The fertilization rate among buoyant eggs obtained by artificial insemination was the highest in black sea bream, followed by red sea bream and the hybrid. The hatching rate was highest in red sea bream, followed by black sea bream and the hybrid. The survival rate 30 days after hatching was the highest in red sea bream, followed by the hybrid and black sea bream. However, the survival rate 71-140 days after hatching was much higher in the hybrid and black sea bream than in red sea bream. Growth until about 8 months after hatching was faster in the hybrid, followed by red sea bream and black sea bream. However, red sea bream gradually outperformed the hybrid from 1 year. After 3 years, the size of the hybrid was about twice that of black sea bream, and half that of red sea bream. The resistance to variation in water temperature or decreases in specific gravity and dissolved oxygen of the hybrid were lower than those of black sea bream but considerably higher than those of red sea bream. The hybrids were closer to black sea bream in the external morphology and body color, suggesting more marked paternal inheritance.

Journal

  • Aquaculture Science

    Aquaculture Science 43 (1), 145-151, 1995

    Japanese Society for Aquaculture Science

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