中海における垂下養殖かきの斃死原因に関する研究-不連続層の界面張力について

概要

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The authors have studied on the abnormal mortality of hunging oyster in the sea of Nakami from the view point of physioal chemistry, and the results are summerised as follows. 1) The water of Nakami is of two layers with the upper of lower salinity, and thus shows a very high vertical stability. Into the distinct discontinuous layer, which develops between them, are supposed to be adsorbed some surface active substances resulting any change of surface tension. 2) Our observation shows, that is the case, and the active substances are hydrogen-and other sulfide and organic matters, and that they were abundant in summer and selectively absorbed into the layer. 3) The greatest damage on oyster seems to take place within the moving range of this discontinuous layer and consequently the surface active substances are supposed to have something to do with the abnormal oyster mortality. 4) The fact that hunging oysters suffered from death to the greatest degree during the period of turbulence of water caused by typhoon or during that of "red-water" in autumn, is explained by dissolution of the injurious substances from submarine deposits and by defusion of the surface active substances of the discontinuous layer into the sea water around.
社団法人日本水産学会の論文