カキ養殖場に於けるニシ貝駆除の研究 : 第一報銅剤の効果試験

概要

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On suggestion of John B. Glude, Fish & Wildlife Service, U. S. A., tests were made to see if metal copper plate would be useful as a barrier to control the Japanese drill, Tritonalia japonica as it is for the Atlantic drill, Urosalpinx cinerea. Various copper paints were also used for the test. 1. Tritonalia japonica reacts sensitively against Cu ion in sea water. They show a contraction of foot at the concentration of 0.5γ Cu++/cc. Complete closure of operculum was observed in 50 percent of the individuals tested at 10γ Cu++/cc and in 100 percent at 20γ Cu++/cc. 2. Copper plate, copper paints were found effective in repelling the drill, T. japonica but not for Rapana thomasiana. Its effect on Thais tumulsa was dubious. 3. Among paints tested, Vinilex copper paint showed the best results comparable to copper plate, for a period of 5-6 months. Ordinary copper paint was effective for less than a month. A period of lasting effectiveness was assumed to depend on the lasting dissolution of Cu ion. 4. In field test it was confirmed that copper plate and Vinilex copper paint can be used as an efficient barrier of controlling the Japanese drill, T. japonica.
公益社団法人日本水産学会の論文