The proper management of water quality in fishing ports handling seafood is necessary for ensuring food quality and public health. In this study, the hygienic conditions at Aoshima fishing port (Miyazaki, Japan) and surrounding coastal areas were investigated. In water samples obtained from inner sites of the port using a lift pump, coliform counts and fecal streptococcus counts varied seasonally from 10 to 10~4 MPN· 100ml~(-1) and from 0 to 10~2 MPN-100ml~(-1),respectively. In water samples from an estuary located adjacent to the port, coliform counts and fecal streptococcus counts werel to 2 orders of magnitude higher that those of water samples from the fishing port. Coliform counts obtained by the MPN method were significantly higher than fecal streptococcus counts and fecal coliform counts obtained by the membrane filter method. Fecal streptococcus counts and fecal coliform counts corresponded to 2% and 3% of coliform counts, respectively. There was an inverse correlation between salinity and coliform counts, and coliforms seemed to be diluted with seawater. Fecal streptococcus counts showed a lower correlation with not only salinity but also turbidity, suggesting that sedimentation and resuspension affect the fecal streptococcus population dynamics in the estuary near the port.%漁港内の海水の水質は，魚介類の安心・安全な品質を保証する上において，基本かつ重要な衛生管理項目である。そこで，漁港周辺水域の衛生管理に関わる現状を把握することを目的として，宮崎県青島漁港および周辺水域を対象として，大腸菌群数とふん便性連鎖球菌数の実態調査を実施した。漁港内で検出された大腸菌群と連鎖球菌は，漁港に接する河川から流入した可能性が高く，港奥部では，大腸菌群数とふん便連鎖球菌数は，それぞれ10～10~4MPN・100ml~(-1)と0～10~2MPN・100ml~(-1)の範囲で大幅に変動した。菌数は夏期に増加する傾向があった。MPN法による大腸菌群数は，ふん便性連鎖球菌数およびふん便性大腸菌群数よりも大幅に高く検出された。ふん便性連鎖球菌数およびふん便性大腸菌群数は，大腸菌群数のそれぞれ2％と3％に相当した。大腸菌群数は，塩分と中位の負の相関関係が認められ，海水による希釈効果が強く依存すると考えられた。一方，ふん便性連鎖球菌数は，濁度と低位の正の相関関係が認められ，底質への堆積と潮汐による再懸濁に影響を受けることが示唆された。
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