Reasons of losses of stocking material in carp farming
2001
Kasesalu, J. | Laius, A. (Estonian Agricultural Univ., Tartu (Estonia). Inst. of Animal Science)
The losses of stocking material of common carp in rearing ponds are caused by parasites Ichthyophthirius multifiliis and Dactylogyrus extensus and in wintering ponds by the parasites that belong to families Chilodonella and Dermocystidium. The swimbladder inflammation causes the death of common carp especially in cool summers and cold winters. About a third of two-summer-old carp dies during the first month after stocking them into the pond in spring. This is due to 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 the two-summer-old carps die of damage of gills and chronic toxication of NH3
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