ELECTROPHORETIC AND MORPHOMETRIC CHARACTERS IN POPULATION DIFERENTIATION OF THE PEARL OYSTER, PINCTADA RADIATA (LEACH), FROM AROUND BAHRAIN

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Abstract
Variation at the leucine aminopeptidase (Lap), glucose phosphate isomerase (Gpi) and tetrazolium oxidase (To) loci was investigated in samples of three populations, Al-Mayana (MAY), Shigita (SH) and Mina Salman (MS), of Pinctada radiata from pearl oyster beds around Bahrain. The To locus was monomor-phic. Significant Lap and Gpi heterozygote deficiencies were evident and it is suggested that these were generated by selection. The MS population, to the East of Bahrain, differed significantly in Gpi allele frequencies from both Northern populations (MAY, SH) and Nei's genetic identity indicates a close relationship between the Northern populations. Measurements of shell morphometrics were used both as ratios of one dimension to another, and as regressions of one dimension on another to examine relatedness between populations. Both these mor-phometric approaches gave different results from each other and also differed from the electrophoretic data. It is concluded that estimates of relatedness in pearl oysters based on electrophoretic data will be more reliable than those based on shell shape.

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