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Interspecific and intraspecific electrophoretic variation in 3 species of pearl oyster from the nansei islands of japan



Interspecific and intraspecific electrophoretic variation in 3 species of pearl oyster from the nansei islands of japan



Bulletin of National Research Institute of Aquaculture (3): 1-10



Electrophoretic analysis was conducted using 3 spp. of pearl oysters, Pinctada fucata, P. albina and P. maculata, collected from 4 localities of the Nansei Islands of Japan. Four loci controlling 3 protein systems, i.e., leucine aminopeptidase (LAP), tetrazolium oxidase (TO) and muscle protein (MP), were examined. On the zymogram of LAP, 6 (P. fucata) or 7 (P. albina) alleles were detected at the Lap1 locus and from 4-6 alleles were detected at the Lap2 locus in the 3 spp. TO bands showed the typical pattern of dimer and 4 alleles were observed at the To locus in all species. Of 2 zones of MP staining detected, the most anodal 1 could be analyzed. Two alleles at the Mp locus were described in P. fucata and P. maculata, while the single band suggested monomorphism at this locus in P. albina. Interspecific differences were seen in MP and LAP pattern among 3 spp., which can be used in identification of these species. Intraspecific variation in gene frequencies at 4 loci among some populations suggested geographical differentiation in P. fucata. In P. albina and P. maculata differences in gene frequences at Lap1, Lap2 and To loci were also observed among some populations.

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