Journal of The School of Marine Science and Technology,Vol.4 No.3
Change in water quality in Shimizu Port and bacteria composition in Orido Bay
Takashi KANEGAE, Yoshio SATO, Shin-ichi ONO, Yoshihisa KATO, Mitsugu NISHIMURA,
Hisashi NARITA, Masaharu FUKUE and Michikazu IKEDA
Abstract
We observed water quality at 16stations in Shimizu Port from 1986to 2005. The observation was carried out 4times a year,and the distributions of coliform bacteria and marine bacteria were discussed.Salinity,pH,DO,COD and T-N have increased since 1998,whereas transparency,SS and T-P have decreased.These may be dependent on the change in loading rate of these substances from the rivers and internal biological production in Shimizu Port. Bacteria were also observed at the mouth of Tomoe River and Orido Bay. The number of coliform bacteria was 3.5×10 5CFU/100ml at the mouth of the Tomoe River.This probably implies that the Tomoe River is polluted with bacteria,such as fecal coliform due to feces origin.The number of a general marine bacteria from the surface water in the inner part of Orido Bay was 2.3〜2.6×10 5CFU/100ml.The dominant bacteria were Vibrio-Aerogenes.They are often found in eutrophicated sea area. Cellulose decomposing bacteria were also found in the sediments.
     
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