ブリの連鎖球菌症における血液性状

概要

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The changes in various blood constituents were examined in both yellowtail Seriola quinqueradiata infected naturally and inoculated with Streptococcus sp. The fish weighing about 150g were injected intraperitoneally with 107 cells of Streptococcus per fish. Examination was carried out in September. The water temperature was about 26°C. The size of spleen, kidney and heart (% of body weight) in naturally infected fish increaded, but that of hepatopancreas did not. Increase in neutrophil count was recognized in both naturally infected and inoculated fish that the symptoms were noticeable, but increase in lymphocyte count was recognized in only the former. Streptococcus sp. infection was associated with increcially proportional to the degree of external symptoms. Erythrocyte count, hrmoglobin level and serum levels of activities of total protein, albumin, globulin, GOT and GPT, remained unchanged. The low nutritional state in naturally infected fish was not especially recognized, but decrease in serum urea-N level suggests that protein metabolism in the fish is low.
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