Reasons of losses of common carp stocking material in Estonia
2000
Kasesalu, J. | Laius, A. (Estonian Agricultural Univ., Tartu (Estonia))
Losses in common carp stocking material in rearing ponds are caused by parasites Ichthyophtirius multifiliis and Dactylogyrus extensus, and in wintering ponds by the parasites that belong to families Chilodonella and Dermocystidium. Swimbladder inflammation causes the death of common carp especially in cool summers and cold winters. About on third oftwo-summer-old carp dies during the first month after their stocking into ae pond in spring because of their bad physiological condition after winter starving, the influence of swimbladder inflammation growing more acute in spring, the attacks of fish-eating birds and various injuries. In the second half of summer two-summer-old carp die of the damage of gills and chronic toxication of NH3
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