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The author gives a review of new literature data from the 80-ties. The following problems are considered: ethiology of swim bladder inflammation in carp (SBI), development of parasites of the class Myxosporea, overgrowth of parasitic kidney disease (PKD) in salmonid fishes, details of development of Myxobolus cerebralis and Ichthyophtirius multifiliis, and the new systematics of the Diplozoidae.
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