The ecological risk provoked by the invading ichthyologic species in the Red-Lake


  • Hunor-Flavius Crişan Faculty of Geography, Babeş-Bolyai University, Cluj-Napoca, Romania
  • Attila Peteley Faculty of Geography, Babeş-Bolyai University, Cluj-Napoca, Romania


biodiversity, ecological balance, native fauna, introduced ichthyologic species


The present study tries to outline a series of risks that are generated through the introduction of some non-native ichthyologic species in the aquatic biotope of the Red-Lake. The study briefly presents the short history of this unique lake formed behind a natural barrier, respectively some critical risks concerning the possible evolution of this lake due to sedimentation factors which can be: natural sedimentation; anthropically-induced accelerated silting; sedimentation triggered by logs fallen into the lake; influences brought about by chemical residues thrown away by the big number of visitors and which come from illegal waste water dumping directly into the lake or into its tributaries. Then the study focuses on the risks induced to the ecologic balance of the lake. Firstly, we presented the native fish species, with rare elements that became endangered in the biotope and the introduced fish species (predatory species) which resulted in the significant reduction of the number of native species. Furthermore, we wish to show in which way the ecologic balance of this aquatic micro-environment has changed during the last 20 years. In the final part of the study, we draw some conclusions and formulated some suggestions regarding the possible solutions and steps to be taken in order to redress the current aspect of the environment, which already seems to be out of control.