養殖ウナギのカラムナリス病と配合飼料との関連性について

概要

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A strain of Flexibacter columnaris was isolated from cultured eel Anguilla japonica for this study. Authors investigated the pathogehetic relation between columnaris disease in cultured eel and granules of fish meal in the formula feeds. An experimentally formulated feeds for eel (white fish meal: a-starch: vitamin mix.: mineral mix.=70:20:0.5:1) and white fish meal were tested as culture meddium for F. columnaris at 1-0.156% range of concentration in distilled water. After 24 hours shaking incubation at 26°C, the microorganism grew well in their media, gathered granules of fish meal and formed a number of colums or stacks on the surface of the granules. Eels exposed for 1 hour at 26°C to this microorganism by means of dipping in a diluted medium, were highly infected by this organism, and high mortality were observed. These infection and mortality were fortified by the addition fo formula feeds to the experimental auarium. While coexistance of diseased fish with healthy fish could not cause any infection, but the addition of formula feeds to this coexistencing aquarium caused highly infection fo F. coulumnaris to healthy fish.
日本水産學會の論文