Fish community studies from riverine Danube Delta (Romania) area in 2007: Şontea-Furtuna and Gorgova-Uzlina lake-complexes

• Main Authors: NĂSTASE Aurel, NĂVODARU Ion, CERNIŞENCU Irina
• Format: Article
• Language: English
• Published: CITDD Publishing House 2009-09-01
• Series: Scientific Annals of the Danube Delta Institute
• Subjects: riverine delta; fish population; ecology indices; biodiversity index
• Online Access: http://www.ddni.ro/manager/editor/UserFiles/File/Scientific%20annals/volume/15/15.pdf
• ISSN: 1842-614X; 2247-9902

The study of ichthyofauna from riverine delta, two lakes complexes Gorgova-Uzlina and Sontea- Furtuna was sampled in September 2007, using two complementary methods of sampling: electric fishing forshoreline and Nordic gillnet fishing for open water. Rich species of ichthyofauna from Gorgova-Uzlina is 29 species, with 3 exotic and 26 native species, but in Sontea-Furtuna are 30 fish species, 5 exotic species and 25 native species. The most abundant fish species are Rhodeus amarus (bitterling), Alburnus alburnus (bleak), Carassius gibelio (gibel carp), Perca fluviatilis (perch) Rutilus rutilus (roach) and Scardinius erythrophthalmus (rudd) with slight differences for two complexes and for those two complementary methods of sampling. In biomass are dominating Carassius gibelio, Esox lucius (pike) Cyprinus carpio (carp) and Perca fluviatilis with slight differences for two complexes and for those two complementary methods of sampling. The lakes complexes has a very stableecosystem regarding fish fauna, with shoreline (0,683 equitability indices in Gorgova-Uzlina respectively 0.562 in Sontea-Furtuna) more stables than open water (0,605 equitability indices in Gorgova-Uzlina respectively 0.496 in Sontea-Furtuna).