瀬戸内海における腸炎ピプリオの分布Ⅱ : 冬季調査について

　1964年3 月12~16 日瀬戸内海中部水域における脱炎ビプリオ(Vibrio parahaemolyticus) の分布を調査した.
( 1 ) 生物1型菌が小豆島の南方海底と四国の高縄半島四方海底から分離検出された.生物2型菌は多度津沖の海底，広島湾の海水，呉沖の海底，三原港外の海水および福山港外の海水中から検出された.
( 2 ) 各生物型菌の検出頻度は夏季調査1) と較べて非常に少ない. しかし海水試料の層別および底質試料の組成別の検出頻度の傾向は夏季と相l似していた.
( 3 ) 生物l型菌が本調査で分離されたことは， その調査地点で越冬をしていたのではないかと思われるが，越冬条件については明らかでない.

In the previous survey of this series') in which the distribution of Vibrio parahaemolyticus (FUJINO et al. 1951) SAKAZAKI et al. 1963 in the Seto Inland Sea in summer was investigated, the biotype 1 organisms of the bacterium were isolated at high ratio from the sandy sea bottoms.

A similar survey was carried out in the central part of the Sea in March of 1964. The location of sampling stations is shown in Fig. 1 and Table 1. Biotype 1 (abbreviated I in Tables 2 and 3) were detected in the bottom samples from St. D and St. I, biotype 2 (abbreviated II in the Tables) were detected in the bottom samples from St. F and St. M and in the sea waters from St. L, St. N, and St. P. As is seen in Table 2, biotype III, an allied species, were detected only in one case, i. e., from the bottom sample of St. K. Detected frequencies of the organisms were very few, but as listed in Table 3, the results of the present and the previous surveys resembled each other in the tendency of the detected frequency.

It was interesting to note that the biotype 1 organisms were found in sandy sea bottom in winter as well as in summer.