ISSN : 1225-3480
The gonadal development, fatness index and spat recruitment of the marsh clam, Corbicula japonica were investigated by using both histological observations and population structure data. Specimens of C. japonica were collected from March 2017 to November 2018 in the Eulsuk tidal flat of the Nakdong River estuary, Korea. The mainly adult clams consisted of shell length 21 to 30 mm, and their density ranged from 8 to 32 ind./m2. The monthly density of Corbicula spats was very low and in the range of 0 to 22 ind./m2, and the highest density occurred in July 2017. Monthly variation of fatness index showed similar patterns to the variation of gonadal development. The sex ratio of male and female was 1:1.4. The gonadal maturity cycle of C. japonica could be classified into five stages according to its developing conditions with the ripe stage from July to August. From the results on gonadal development, fatness index and in-situ spat recruitment, the spawning season of C. japonica in the study area was estimated to be from July to September, and main recruitment might occur in August.
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