ブリ連鎖球菌の特性

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  • Characteristics of Streptococcus sp. Pathogenic to Yellowtail
  • ブリ レンサ キュウキン ノ トクセイ ガン シツギ オウトウ

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Since the first report of occurrence in 1974, streptococcal infection in cultured yellowtail Seriola quinqueradiata have been spread in almost all area in Japan increasing economical loss year by year. To establish principles for prevention and therapeutical treatment it is necessary to have sufficient informations on characteristics of the pathogen. In this paper, growth properties, survivability in seawater, distributions in culturing area and in the fish body and effects of toxins produced by Streptococcus on the infection are described.<BR>In cultural conditions, growth occurred at a range (optimum) of 10-45°C (20-37°C), 0-7.0% (0%) of NaCl concentration and pH 3.5-10.0 (7.6). Prolonged survivability was observed in seawater especially in the seawater obtained from pen-culturing area resulting for 42 days at 25°C. Pathogenic Streptococcus was detected in seawater, bottom mud and the intestine of fish such as chub mackerel Scomber japonicus and black scraper Navodon modestus.<BR>Isolation could be easily performed from the kidney, the spleen and the intestine of the infected fish. From the reason that a large number of cells were detected in the intestine of moribund fish, this organ was considered to be the principal site for the progress of the infection. Endotoxin produced by Streptococcus showed lethal activity at a level that LD50 was 32 mg/10 g body weight of fish. Though exotoxin also produced by Streptococcus had relatively low lethal activity that LD50 was 79 mg/10 g, it was considered to have a supporting function to progress the disease.

収録刊行物

  • 魚病研究

    魚病研究 17 (1), 11-16, 1982

    日本魚病学会

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