Gymnodinium sp.のシオミズツボワムシBrachionus plicatilisに対する致死作用

概要

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Gymnodinium sp. (tentatively named as G. type'65) is a main causative organism of red tides occurring frequently at Omura Bay since 1965. However, the toxicity of this species to aquatic animals has still remained doubtful. This study demonstrates the lethal effect of G. type'65 on the rotifer,Brachionus plicatilis. Culture of G. type'65 displayed the lethal effect on the rotifer more fetal in exponential growth stage (24-hr. Tlm : 3.3 cells/ml) than in stationaly stage (24-hr. Tlm : 195 cells/ml). If the living cells were filtered out or destroyed by ultrasonics, the suspension of G. type'65 even at the high concentration of 8～10 x 104 cells/ml completely lost the lethal ability to the rotifer. These facts indicate that the existence of living cells is strictly essential for G. type'65 to display the lethal effect on the rotifer.
長崎大学水産学部の論文