海棲メダカの研究 : I.野外観察

概要

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In general, the Medaka in found in fresh water or in brackish water. The present report deals with the fact that they are adapting to and living in sea water, and the discussion on some environmental conditions which seems to be advantageous for them to adapt to sea water. 1. The Medaka could be observed at the sea shore near the Marine Biological Laboratory of Kumamoto University, Kumamoto, Japan. Near the shore at which the Medaka could be seen, there was a Shiodame which was a kind of pool and was constructed as a barrier for inward flow of tide to a field. 2. When the Medaka living in fresh water was exposed to sea water immediately, they were unable to survive, but in the case of the Medaka living in the Shiodame they were able to survive in sea water. From these observations, it seems that the Shiodame has contributed to the adaptation of the Medaka living in fresh water to sea water. 3. By the change of tide, the salinity of water in Shiodame was changed from that of fresh water to that of sea water successively. Some grade of salinity which must exist in the Shiodame plays an important role for the Medaka to adapt to sea water.
社団法人日本動物学会の論文
1961-06-15