• The Korean Journal of Malacology
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• v.32 no.3
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• pp.197-202
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• 2016

This research reports the intersexuality of bivalves, such as Crassostrea gigas, Mytilus galloprovincialis, Rupiditapes philippinarum, Gomphina veneriformis and Barnea davidi discovered during the process of investigating the ecological health status of coastal waters of Korea. In intersex ovaries, the opposite germ cells were observed either individually or in groups in the interfollicular space and inside the oogenic follicle. Oocytes in the intersex testis were at the previtellogenic or initial vitellogenic stage. They were either scattered individually or in groups in the interfollicular space and inside the spermatogenic follicle. The intersexuality in C. gigas was 10.4% (n = 19/183), while female (12.2%, n = 6/49) exhibited a higher proportion than male (9.7%, n = 13/134). The intersexuality in M. galloprovincialis was 31.7% (n = 19/60), while female (36.4%, n = 12/33) exhibited a higher proportion than male (25.9%, n = 7/27). The intersexuality in R. philippinarum was 11.2% (n = 11/98), while male (16.7%, n = 7/42) exhibited a higher proportion than female (7.1%, n = 4/56). The intersexuality in G. veneriformis was 28% (n=30/107), while male (31.5%, n=17/54) exhibited a higher proportion than female (24.5%, n=13/53). The intersexuality in B. davidi was 18.4% (n = 7/38), while female (35.7%, n =5 /14) exhibited a higher proportion than male (8.3%, n = 2/24).