A bacteriological study of sea water and oyster in Tongyeong coastal area was conducted to evaluate sanitary conditions of the bay and compliance of waters with the recommended bacteriological criteria for the designated area of shellfish cultivation. The Samples were collected at 5 zone, 34 sampling stations(Fig. 1) established once a month from September 1997 to August 1998. During the study period, temperature ranged from 6.9 to 23.6℃, transparency ranged from 2.6 to 6.2 m, chemical oxygen demand ranged from 1.35 to 1.82 mg/l, dissolved oxygen ranged from 5.0 to 9.9 mg/l, dissolved nitrogen ranged from 1.60 to 8.17 ug-ab/l, phosphate ranged from 0.14 to 1.21 ug-ab/l, Chlorophyll-a ranged from 2.03 to 69.9 mg/㎥, respectively. The coliform group and fecal coliform MPN's of sea water were ranged from $lt;3.0-1,600 and $lt;3.0-540, respectively. The coliform group and fecal coliform MPN's of oysters were ranged from $lt;18-6,000 and $lt;18-2,200, respectively. The viable cell counts in oyster ranged from 1.5× 10² to 8.2× 10³. The coliform grnup, fecal coliform, classification of coliform group with IMViC reactions and pathogenic vibrios were analyzed. 437 strains that were obtained from Tongyeoung coastal area seawater samples represented E. coli group 47.5%, C. freundii group 14.8%, K. aerogenes 10.9%, unknown 26.8%, respectively. During the study period, infectious bacteria such as Vibrio cholerae, Salmonella sp. and Shigella sp. were not detected from the samples, but detection ratios ofVibrio parohaemolyticus and Vibrio vulnificus were 12-21% in summer months.

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