ガザミおよびノコギリガザミの卵とふ化幼生の真菌症に対するホルマリン浴の効果

概要

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In order to control fungal diseases caused by Lagenidiales in the eggs and larvae of the swimming crab, Portunus trituberculatus, and the mud crab, Scylla serrata, experimental infection of the crabs' eggs within one day of spawning and one day before hatching was tested. The eggs were reared in seawater containing several different concentrations of formalin, followed by inoculation with zoospores of five virulent fungal strains belonging to the order Lagenidiales (each one strain of Haliphthoros, Sirolpidium, Atkinsiella and two strains of Lagenidium). Bath treatment with 25ppm formalin was found to prevent the occurrence of fungal infection in eggs and newly hatched larvae. However, the bath treatment with 25ppm formalin is toxic to eggs up to one day after spawning, and also toxic to ovigerous females if they are treated for a longer period, so it was thought that the prevention of fungal infection by formalin bath treatment of eggs was not practical. On the other hand, hatching and newly hatched larvae did not show any changes by the same bath treatment. Consequently, the bath treatment with 25ppm formalin of newly hatched larvae in the hatching tank was concluded to be a practical method for inhibiting the occurrence of diseases caused by Lagenidiales in larval rearing tanks.
日本水産學會の論文