電氣漁網の研究(第I報) : 有效周波數の選定に就て

概要

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Up to the present time, the studies on electric fishing screen have been chiefly attempted upon the ecological processes either by simple electric direct current or by commercial alternative current. The present writer intended to get more practical and useful effects by finding out the most suitable forms of electric waves, cycles and electric powers through the electrodynamical investigations for the e??ectric fishing screen. In this paper, the cycle of electric waves which are to be adopted practically has been also discussed theoretically according to some new experimental results. The theoretical foundation was obtained from the experimental facts that confirmed the existence of ζ(zi:t∂)-point in some kinds of fish. The ζ-point, called by the author, means the boundary point in which the motion, ahead or astern, of fish is to be districted by the shifting presence of the electric stimuli in the b??dy of fish. In consequence of this investigations the results were summarized as follow: a) As to the useful cycles a clear distinction between the electrifying one and electrocuting one should be kept strictly. b) Lower frequency of cycles than that of anticipated one should be employed. c) Larvae of fish may be protected by limitting the frequencies of cycles.
公益社団法人日本水産学会の論文