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BIODIVERSITY AND ECOLOGICAL APPRAISAL OF THEFRESHWATER ECOSYSTEM OF THE PYASACHNIK RESERVOIR,BULGARIAD. Kirin 1 , V. Hanzelová 2 , Ľ. Turčeková 2 , L. Pehlivanov 3 , S. Shukerova 1 ,M. Nikolova 3 , T. Barciová 2 , S. Hristov 11 Agricultural University – Plovdiv, Mendeleev 12, 4000 Plovdiv, Bulgaria,E-mail: dianakirin@yahoo.com; 2 Parasitological Institute, Slovak Academy ofSciences, Hlinkova 3, 04001 Kosice, Slovakia, E-mail: hanzel@saske.sk; 3 CentralLaboratory of General Ecology, Bulgarian Academy of Sciences, 2 Gagarin Street,Bulgaria, E-mail: luchezar_pehlivanov@yahoo.comStudy of biodiversity of freshwater fish and parasite communities in PyasachnikReservoir in southern Bulgaria characterized by heavy metal pollution was carriedout. Investigation of the actual state of the water pollution from an aspect ofloading environment with heavy metals and their impact of fish, fish parasites andbiodiversity of water organisms in general was accomplished. Assessment of fishparasites as potential bioindicators of water pollution was made. For examinationsare used standard methods and techniques. The studies, belonging to 70 specimensof fish representing 6 species during the three seasons were presented. Nine speciesof parasites in 3 species of fish, Perca fluviatilis (L.), Scardinius erytrophthalmus(L.) and Alburnus alburnus (L.), were determined. With the highest speciesdiversity were distinguished the helminthfana of P. fluviatilis (7 species). Thedominant structures of helminth communities are characterized. The contents ofheavy metals (Pb, Zn and Cu) (mean concentration, bioconcentration andbioaccumulation factors) in the tissues and organs of fish species and fish parasiteswere discussed. The studies carried out could be used in various monitoringsystems for screening the pollution on the water environment and the organismsinhabiting the anthropogenous ecosystems.31МИШЕВИДНИТЕ ГРИЗАЧИ КАТО ТЕСТ СИСТЕМА ЗА ОЦЕНКА НАВЛИЯНИЕТО НА ОКОЛНАТА СРЕДА ВЪРХУ ГЕНЕТИЧНИЯАПАРАТМ. Топашка-Анчева, Р. Мечева, Ц. Герасимова, К. ДимитровИнститут по зоология, БАНЗамърсителите на околната среда доказано оказват влияние върхугенетичните структури на различни групи организми. Задачата нанастоящото изследване е да се сравнят данните за честотата и типа нахромозомните аберации в горски мишки (Apodemus flavicollis) за оценка нагенетичния риск като резултат от комбинираното и кумулативно действие нарадионуклиди, тежки метали и токсични елементи. Горски мишки, събраниот различни антропогенно повлияни или условно чисти райони на страната,както и от района на запечатано през 1992 год. ураново находище126