BOTHRIOCEPHALUS SPP. INFECTION OF CYPRINIDAE: EPIZOOTOLOGY, CLINICAL FEATURES AND PATHOGENESIS, DIAGNOSTICS, THERAPEUTIC AND PROPHYLACTIC MEASURES

• Published in: AGROFOR
• Main Authors: SKACHKOV, Dmitrij, THAKAHOVA, Amina
• Format: Article in Journal/Newspaper
• Language: srp
• Published: NULRS 2018
• Subjects: Arctic
• Online Access: http://doisrpska.nub.rs/index.php/AGR/article/view/5053; https://doi.org/10.7251/AGRENG1802091S

Bothriocephalosis of fish is a disease caused by tape worms Bothriocephalusopsariichthydis and Bothriocephalus acheilognathi parasitizing in the anterior partof intestine. Bothriocephalus spp. infection is widely spread among fish at pondfarms, cage fish farms in cooling ponds of thermal power and nuclear powerstations and in natural reservoirs. One have revealed Bothriocephalus in 26 speciesof fish attributed to Cyprinidae family, in salmons (Arctic salmon) and in somepredatory fish (catfish, pikeperch). Different species of cyclopes serve as theintermediate hosts necessary for development of helminths. Fish fry and fingerlingsare the most susceptible ones to infection. Fish of older age groups are lesssusceptible to this parasite. The data on biology, epizootology, clinical features andpathogenesis, diagnostics, therapeutic and prophylactic measures against thisinfection are represented. The results of the field trials with microsal againstBothriocephalosis in carps and grass carps carried out in different regions of theRussian Federation as well as monitoring of the safe use of microsal for the studyperiod (2007 to 2016) are described. The daily dose of medicated feed with 2% ofmicrosal corresponds to the daily feeding for fish. The therapeutic feeding iscarried out during one day without preliminary starvation period according to thecurrent technology of fish feeding with granulated feed. The dose level accordingto the active substance depends on water temperature and average fish weight andranges 12 to 40 mg/kg. Prophylactic treatment is carried out twice a year: in lateApril – early May and in late August – early September (at pond farms) and in lateSeptember – early October (at cage fish farms) when the water temperature is nothigher 150 C. In general the data obtained for 10 year period evidence aboutmicrosal’s safety for fish and at it's current application (according to theinstructions) the reasonable benefit/risk ratio is maintained in all cases.