Phyto-pigments in the digestive diverticula of juvenile Japanese pearl oyster, Pinctada fucata martensii, as indicator of algal diets feeding
2001
Numaguchi, K. (National Research Inst. of Fisheries Science, Yokohama (Japan))
Changes in the phyto-pigments (chlorophyll alpha + phaeo-pigment) in the digestive diverticula of juveniles Japanese pearl oyster, Pinctada fucata martensii, (average whole weight; 3.34g, n = 20), and relationship between feeding concentration of micro-algal diet (Isochrysis aff. galbana (Parke) clone T-Iso) and phyto-pigment content in the digestive diverticula of the pearl oyster juveniles, and glycogen content of adductor muscle of the pearl oyster juveniles were determined. Phaeo-pigment contents in the digestive diverticula were much higher than chlorophyll alpha. Phyto-pigment content in the digestive diverticula increased after feeding the algal diet, and phyto-pigment contents included in the digestive diverticula reached a maximum 24 hours after feeding of the algal diet. There was a positive correlation between the feeding algal diet concentration and the phyto-pigment contents in the digestive diverticula of the pearl oyster juveniles. Glycogen of the adductor muscle also increased with the increasing feeding algal diet concentration. These results indicate that phyto-pigment contents included in the digestive diverticula of pearl oyster juvenile might be a good indicator of feeding of algal diets of pearl oyster juveniles.
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