Influence of biogenic metals (Cu,Zn) on the activity of carbohydrases in juvenile fish in vitro |
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Authors: | I L Golovanova |
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Institution: | (1) National Institute for Materials Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan;(2) Quantum Beam Center, National Institute for Materials Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan |
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Abstract: | It was revealed that intestine and whole-body amylolytic activity (AA) in juvenile fish serving as potential feeding items
for piscivores significantly decreases in the presence of Cu and Zn ions within a wide range (0.1–25 mg/l) of concentrations
in vitro. In most of the studied fish species, Cu and Zn decrease the activities of carbohydrases in the intestine mucosa
stronger than in the whole-body. On the other hand, in piscivore-facultative benthivore perch, which have the least AA, the
inhibiting effect of Cu and Zn ions is 1.5 to 2 times higher in the whole body than in the intestine. The study data suggest
that Cu and Zn ions at concentrations found in organisms that serve as fish food may not only reduce the rate of initial stages
of carbohydrates hydrolysis in the juvenile fish intestine, but also considerably decrease the potential contribution of the
food objects to the digestion processes in typical and facultative piscivores. |
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Keywords: | |
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