title: [A new method of therapy for branchiobdellosis in crayfish].
abstract: Crayfish (Astacus fluviatilis Fabricius, 1793) were treated three times with a bath of diluted ammonia water and proflavine for four and six minutes at a temperature of 18 degrees C to get rid of the ectoparasitic worms of Branchiobdella parasita Henle, 1835; the hatching ability of the Branchiobdella parasita eggs was stopped after the treatment. No lethal effect of the bath on the crayfish of 5 to 14 cm was observed, the lethal effect on the young crayfish borne on the uropods of the female crayfish cannot be eliminated: during the baths the young crayfish died (the death rate was approximately 6% of the average fertility of crayfish); the young crayfish may have been damaged during the treatment operations with the crayfish. The bath of diluted ammonia water and proflavine may be recommended for the treatment of branchiobdellosis in crayfish to be planted, or after several-hour storage of crayfish supplied to the market. One replication of the above cycle is sufficient according to the results obtained. The ammonia content in the ammonia water depends also on the duration of storage and on the storage temperature--it can drop during the storage. Therefore the ammonia water should be used as soon as possible after the despatchment from the place of production; the ammonia content should be determined by means of titration before preparing the bath, and according to this content the dilution ratio should be adjusted.
mesh_terms: D000641:Ammonia / Q000627:therapeutic use; D000818:Animals; D003400:Astacoidea / Q000469:parasitology*; D001494:Baths; D004478:Ectoparasitic Infestations / Q000628:therapy / Q000662:veterinary*; D008722:Methods; D011370:Proflavine / Q000627:therapeutic use; D013696:Temperature
chemical_list: D000641:Ammonia; D011370:Proflavine
vernacular_title: Nový způsob lécení branchiobdelózy raků.