Changes of Microflora in Seawater of Aquaria with Recirculating Water System, Stocked with Japanese Flounder at a Juvenile Stage.

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Microflora in seawater of glass aquaria (47 l in capacity) equipped with the recirculating water system, in which five to 10 juveniles of Japanese flounder, Paralichthys olivaceus, were stocked, were investigated. Flavobacterium, Moraxella and Pseudomonas were predominant in almost all samples with densities of 6.9×102 to 7.6×104 CFU/ml. In contrast, genus Vibrio appeared immediately after the fish were introduced. It became predominant at densities of 1.3×103 to 3.4×104 CFU/ml and decreased slightly after removal of fish. Both micro-bound and pelleted diets contained only Gram-positive bacteria at densities of 6.9×105 to 8.1×105 CFU/g. Intestinal contents of Japanese flounder were colonized only by Vibrio at densities ranging from 1.9×106 to 1.1×109 CFU/g. These results strongly suggested that genus Vibrio appeared in seawater of flounder-rearing aquaria was derived from fish intestines. Furthermore, the results demonstrated that microflora of seawater is significantly influenced by fish culture.
日本水産増殖学会の論文