Abstract
Mytilus edulis could be induced to discharge the reproductive substances by the injection of isotonic M/2 KCl aqueous solution into its visceral cavity. Even by 0.5 cc injection almost all of the animals reacted to spawn. Reaction time was ranged from about 1 hour to more than 5 hours. In most cases, eggs or sperm were carried out of the shell by weak current of cilliary motion of the mantle. These aspects are somewhat differ from either natural spawning or the way induced by electric stimulation, in which the spawning takes place about 1 hour after the stimulation and the reproductive substances were carried far out of the shell by strong exhalant current. However, the eggs discharged by KCl injection are all matured and fertilizable by the spermatozoa, which are also discharged by the same way.
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