Release method of abalone Haliotis discus discus seeds using transparent corrugated sheets
2009
Shirafuji, N.(Hokkaido National Fisheries Research Inst., Kushiro (Japan)) | Nishigaki, T. | Yatsuya, K. | Wada, Y. | Takeno, K.
Release modules made of opaque material have been used for the release of abalone Haliotis discus discus seeds into hiding places on the sea bed. However, some seeds which remain in the shade of the tool due to negative phototaxis even after their release have been considered to show a higher probability of predation compared to seeds immediately moving to the shade of rocks. We developed a new method to release seeds using transparent corrugated sheets. The new method was successful to increase the mean rate of seeds that left the transparent sheets just after release. Transport methods also have been considered to affect the behavior of released seeds. We compared the existing methods of seeds on corrugated sheets bathed in sea water in a tank or wrapped with a wet sponge. When the transport time was more than an hour, seeds bathed in sea water were more viable than those wrapped in a wet sponge.
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