マシジミの生殖法について
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概要
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The ovulation of a freshwater clam, Corbicula leana, which has hitherto been believed to be a viviparous species was observed both in indoor laboratory and outdoor culture pond. The results are summarized below : (1) Clams ovulate all the year round in an aquarium with water temperature higher than 19℃. Eggs develop into D-shaped larvae. Spawning and development to D-shape larva are also observed in the same way in an outdoor culture pond. Thus, reproduction of C. leana is of both ovoviviparity and oviparity. (2) D-shaped larvae are reached within 60 hours after being spawned in water temperature higher than 20℃. (3) Ovulation takes place simultaneously for all clams kept in either aquarium or culture pond.
- 1975-04-30