Abstract
The activity of hydrolases (maltase, sacharase, amylolytic activity) in the intestinal mucosa of the planktofagous blue bream Ballerus ballerus and benthofagous white-eye bream Ballerus sapa were investigated. The thermal characteristics of maltase hydrolysis (Topt and Eact) are similar in both species. The lower KM of maltase hydrolysis in the white-eye bream reflects a higher enzyme/substrate affinity and indicates a more effective carbohydrate hydrolysis in the bentho-versus planktofagous species. The glycosidase activity in the white-eye bream is twice as high as in the blue bream. This may be due not only to different feeding spectra and biochemical food composition but also to differencies in the thyroid status of species under consideration.
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