COMPARATIVE OBSERVATION ON THE RANGE OF GROWTH TEMPERATURE AMONG THREE BIOTYPES OF VIBRIO PARAHAEMOLYTICUS

Abstract

It is well known that Vibrio parahaemolyticus can grow well above 30°C and the optimum temperature for growth of the organisms is around 37°C. In the present study, comparative investigations on the minimum and maximum limits in temperature for the growth among the three biotypes¹⁾ of V. parahaemolyticus were made. Results obtained were as follows. Growth rates of all the test strains of the three biotypes decreased with the drop in temperature, especially below 15°C the growth was markedly retarded. It was shown that minimum temperature for growth of the three biotypes were resembled one another and were around 10°C. On the other hand, it was revealed that the maximum limits for growth of the Biotype 1 and 2 were about 44.5° and 44.0°C, respectively, whereas those of Biotype 3 were about 40°C or lower. The information that the maximum growth temperatures of Biotype 3 organisms are distinctively lower than the other two biotypes may be available for the sup-pression of Biotype 3 organisms in the isolation process of Biotype 1 organisms from marine samples.