INFLUENCE OCCURRENCE LAKES BICAZ AND POIANA TEIULUI ON FISH
COMMUNITIES IN THE BISTRITA RIVER
STOICA IONUĆą, BATTES KLAUS WERNER, PRISECARU MARIA âVasile Alecsandriâ University of Bacau, Faculty of Science, Department of Biology, Marasesti Street, 157, Romania e-mail: ionut_stoica23@yahoo.com; klaus_battes@yahoo.com; prisecaru_maria@yahoo.com;
To highlight the changes in the structure of fish communities through the advent of Bicaz lakes and Poiana Teiului samples were taken both from the two lakes, using trammel and the upstream river areas (Bistrita - Galu) and downstream (Bistrita - City Bicaz) them. The two lakes were identified higher valences species to environmental conditions and food (perch, bleak, chub) except nase identified Bicaz lake, which with the advent dam at Poiana Teiului, probably will not be able to migrate on the river, leading to the reduction and disappearance of the numbers of the lake. By sampling upstream and downstream, by calculating some ecological indices in the two collection points is apparent influence they have two lakes on the fish fauna of the river. Fish community structure is slightly modified in the upstream of the two lakes. Downstream river course due to strong fragmentation and water pollution, fish community structure is changed by the dominance resistant species with broad valences. This is less evident in the calculated IBI as there are a number of species typical of the river, they got off the Bistrita river right tributary of Bicaz.
