Science Links Japan | Changes in Colony-Forming Marine Bacterial Populations Invaded in a Ship's Ballast Water and Sediments on the Way to Qatar from Japan

Changes in Colony-Forming Marine Bacterial Populations Invaded in a Ship's Ballast Water and Sediments on the Way to Qatar from Japan

Accession number;06A1016244

Title;Changes in Colony-Forming Marine Bacterial Populations Invaded in a Ship's Ballast Water and Sediments on the Way to Qatar from Japan

Author; MIMURA HARUO (Kobe Univ., Kobe, Jpn) OKUYAMA SHUHEI (Kobe Univ., Kobe, Jpn) ISHIDA HIROSHI (Kobe Univ., Kobe, Jpn)

Journal Title;Kaiyo Kogaku Shinpojiumu (CD-ROM)

Journal Code:S0108B

ISSN:

VOL.19th;NO.;PAGE.ROMBUNNO.8(2006)

Figure&Table&Reference;FIG.4, TBL.2, REF.12

Pub. Country;Japan

Language;English

Abstract;Changes in total numbers of colony-forming eutrophic marine microorganisms were examined for five voyages in 2005 to 2006. Sampling was carried out on board when the ballast water was loaded in Japan, exchanged in the high seas, and discharged prior to the arrival in Qatar. They were kept at 4.DEG.C. until arrival in Japan. In the ballast water taken in Japan, total numbers of colony-forming cells were highly variable in the range of 10'3.1' to 10'5.6' colony-forming units (CFU) ml'-1' throughout the five voyages. The ballast water is exchanged in the high seas. The values of the number of colony-forming cells in the samples taken from discharging and reloading ballast water varied 10'3.2' to 10'4.6' CFU ml'-1' and 10'2.7' to 10'5.2' CFU ml'-1', respectively, regardless of seasons. When the reloaded ballast water was discharged at the Ras Laffan port in Qatar, the number of colony-forming cells varied from 10'2.6' to 10'5.1' CFU ml'-1'. These results indicate few effectiveness of the ballast water exchange in the high seas. In sediment samples, the values of 10'5.2' to 10'7.2' CFU ml'-1' were estimated for all seasons in which voyages took place. The values in sediments were higher than those counted in the ballast water, indicating the importance of sediment management as well as ballast water management on ocean going vessels. We also counted the number of viable Vibrio sp. cells in the ballast water and sediment, the values of which varied from zero to 10'4.7' CFU ml'-1' for all seasons. Generally, sediment in ballast tanks contained more viable Vibrio sp. cells than those in ballast water. So far examined, we did not detect pathogenic Vibrio cholerae throughout all the experiments. (author abst.)

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