Ecological study on spawning and early life stage of the brackish water bivalve Corbicula japonica in Lake Abashiri [Japan]
2006
Baba, K.(Hokkaido. Hakodate Fisheries Experiment Station (Japan))
The spawning probability of Corbicula japonica is expressed with temperature and salinity by the following equation: (1) 1/(1+exp[-(-16.12+0.57T-12.64S+0.59TS)]), (T Temperature, S: Salinity). The occurrences of the planktonic larvae can well be predicted by the equation in, Lake Abashiri. C. japonica failed to spawn when the temperatures and the salinity did not exceed the threshold environments for the spawning; the threshold environments are expressed by the equation(1). The failure of the spawning was not an exceptional phenomenon in Lake Abashiri; the failure probably occurred in 10 out of 2l years for which data were available. The ovaries after the spawning season in the spawning-failure years were histologically characterized by massive atretic oocytes.
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