Article: Effects of vitamins A and D on shell biomineralization of abalone Haliotis discus hannai, Ino.

ABSTRACT A 152-day feeding trial was conducted in a recirculating water system to investigate the effects of vitamins A (retinol) and D (cholecalciferol) on shell biomineralization of the abalone Haliotis discus hannai Ino. Triplicate groups of juvenile abalone (initial weight: 0.35 [+ or -] 0.03 g; initial shell length: 11.31 [+ or -] 0.25 mm) were fed to satiation daily with one of the 16 semipurified diets containing 0, 1 x [10.sup.3], 1 x [10.sup.5], 1 x [10.sup.6] IU/kg vitamin A and 0, 500, 1 x [10.sup.3], 5 x [10.sup.3] IU/kg vitamin D in a 4 x 4 factorial design. The results showed that vitamin D significantly increased the ratio of calcite/aragonite in the shell, ...

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