Presence of Clostridium botulinum in fish is a result of the marine environment contamination with this bacteria. From among 152 herrings of Southern Baltic Sea origin in 20 cases intestinal canals of fish were contaminated with Cl. botulinum. Type E was identified in 28 cases while 2 samples were positive for Cl. botulinum type A. Percentage of positive results ranged from 4 to 50 depending of the batch of fish tested. An average perccntage was equal to 19.7 ; for type E - 18.4% and 1.3% for type A.
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