Abstract
The changes in bacteriolytic and proteolytic activities of skin cathepsins L and B were studied in thermal-stressed European eel ( Anguilla anguilla). When fish were kept in 10°C water, all activities increased to reach maximum levels at Day 8 with varying increasing rates of 3.0 (proteolysis), 4.2 (lysis of Flavobacterium columnare), 5.7 (lysis of Vibrio anguillarum) and 7.8 (lysis of Edwardsiella tarda) fold. High water temperature at 30°C also induced marked increases in these activities, and the increasing rates were evaluated as 1.5 (bacteriolysis)–2.0 (proteolysis) fold higher than those at 10°C. Results show a high sensitivity of eel skin cathepsins in bacteriolysis and proteolysis to thermal stress.
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