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- Title
Captive populations of fishes in the Crişul Repede River (Tisa River Basin).
- Authors
Telcean, I. C.; Cupşa, D.
- Abstract
During the latest decades several hydropower plants were built along the rivers of the eastern Tisa (Tisza) River Basin. The tributary Crişul Repede (Sebes-Körös) seems to be the most affected river from that area of Tisa (Tisza). There are three hydropower dams and numerous sills on the river bottom that prevent the migration of potamodromous fishes. There are a number of 15 species that are more or less affected and form captive populations along this river. The populations of Chondrostoma nasus, Vimba vimba, Barbus barbus and Aspius aspius seem to be significantly affected by river damming. There are no previous studies regarding the captive fish population in Crişul Repede River. We consider that the most harmful effects related to the dam and sill construction are the changes in spawning behaviour (less aggregation of fishes at spawning sites, alteration of water velocity and temperature in the spawning area, increased prevalence of paired mating and inbreeding due to genetic pool losses) and in population survival rates. Our observations carried out in the last two decades refer to the increasing number of affected species and to the mechanisms of population isolation along the river. Another observation concerns the natural "drift" of juveniles, which we hypothesize that it can reduce the negative effects of isolation. Regarding the intensification of the inbreeding process further studies on the integrity and morphological variability of fish populations are needed.
- Subjects
TISZA River; FISH migration; WATER power; DAMS; ANIMAL young
- Publication
Pisces Hungarici, 2015, Vol 9, p75
- ISSN
1789-1329
- Publication type
Article