Microbial Flora of Pacific Oysters ( Crassostrea gigas ) Subjected to Ultraviolet-Irradiated Seawater
The ability of oysters to purge themselves of microbial contaminants was investigated by identifying the microorganisms retained by oysters after they have been subjected to ultraviolet (UV) light-treated seawater. A UV intensity of 960 μw per min per cm 2 reduced the microbial count of seawater fro...
| Published in: | Applied Microbiology |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
American Society for Microbiology
1972
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1128/am.23.1.11-16.1972 https://journals.asm.org/doi/pdf/10.1128/am.23.1.11-16.1972 |
| Summary: | The ability of oysters to purge themselves of microbial contaminants was investigated by identifying the microorganisms retained by oysters after they have been subjected to ultraviolet (UV) light-treated seawater. A UV intensity of 960 μw per min per cm 2 reduced the microbial count of seawater from 263 to 13 per ml. The coliform multitube test (MPN) was reduced from a high of 17 to <0.18 per 100 ml. Over 75% of the microorganisms found in treated seawater were Acinetobacter/Moraxella, Vibrio/Pseudomonas type II, and Flavobacterium/Cytophaga . With the exception of coliforms, the microbial composition of oysters subjected to UV-treated seawater remained at levels comparable to the control oysters held in untreated seawater. Total counts ranged between 10 3 and 10 5 /g. The microorganism most frequently encountered were Flavobacterium/Cytophaga, Vibrio/Pseudomonas type II, Pseudomonas type III or IV, Acinetobacter/Moraxella , gram-positive cocci and Bacillus . Together they comprised over 90% of the flora. Coagulase-positive, deoxyribonuclease-positive, and beta-hemolytic cocci were found in some samples, as were V. parahaemolyticus, V. aliginolyticus , and Aeromonas species. |
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