瀬戸内海における腸炎ピプリオの分布Ⅰ : 夏季調査について

　1963年9月瀬戸内海東部水域， 1964 年9 月同西部水域の合計36 地点につき腸炎ビプリオ( Vibrio parahaemolyticus) の分布を調査した.
(1) 生物1型菌は大阪湾，播磨灘，水島灘および周防灘南部から比較的多く検出された2型菌と類似菌は全水域から多く検出された.
(2) 生物1型菌は海底砂質から2型薗は水深には無関係に海水から高率に検出された.類似歯は海水・底質共に広く分布しているようであった.
(3) 本菌の分布と海況との関係については， この調査では特に有意と思われる相関は見出せなかった.

The present survey was undertaken to investigate the distribution of Vibrio parahaemolyticus (FUJINO et al. 1951) SAKAZAKI et al. 1963 in the Seto Inland Sea in summer. The survey was carried out aboard the Toyoshio-maru, research vessel of Hiroshima University, in the eastern part of the Sea in September of 1963, and in the western part in September of 1964. The location of sampling stations is shown in Fig. 1 and Table 1.

A selective liquid medium was prepared with 3% NaCI containing arabinose ethyl-violet broth as described by HoRIE et aJ. 4 ) and a BTB teepol agar medium was used to detect the bacteria according to the official method10 ) of the Japanese Ministry of Health and Welfare.

Biotype I organisms (abbreviated I in Tables 2 and 3) of the bacterium, being believed to cause acute gastro-enteritis to man, were found to be widely distributed in Osaka Bay, Harima-nada, Mizushima-nada, and the southern part of Suo-nada as seen in Table 2.

As listed in Table 3, moreover, biotype I was isolated at high ratio from sandy sea bottom. Biotype 2 (abbreviated II in the Tables) was isolated from extensive areas of the Sea and irrespective of the depths from the surface. An allied species (abbreviated III in the Tables) was felt to constitute considerable proportions in both sea water and sea bottom.

In so far as this survey was concerned, the distribution of the bacteria had no relation to the values of such oceanographic properties as chlorinity, dissolved oxygen, or temperature.