STATUS OF PEACEFUL AND PREDATORY FRESHWATER FISH STOCKS IN THE DANUBE SECTOR KM 1020 - KM 1071 IN CORRELATION WITH THE VARIATION OF RIVER LEVELS AND TEMPERATURES IN AUGUST-NOVEMBER 2019

Maria-Cristina Chioveanu, Maria-Desimira Stroe, Magdalena Tenciu, Liliana Athanasopoulos, N. Patriche

Abstract
   This present paper has the purpose to analyze the influence of environmental factors on catches and family structures of fish in the Danube River, sector km 1020 - km 1071. The biological material was collected from the autumn fishing between August and November 2019. During the four months, following the scientific fishing, 1.250 fish specimens belonging to 7 species were collected. The dominant family, Cyprinidae with a percentage of 74%, is represented by four species, namely Cyprinus caprio (carp), Carassius gibelio (crucian), Abramis brama (bream), Ctenopharyngodon idella (grass carp), followed by the family Percidae with a percentage of 23% represented by two species Sander lucioperca (pikeperch) and Exos lucius (pike), and the family Siluridae with a percentage of 3% represented by Silurus glanis (catfish). Both temperature and water levels were raised in correlation with total catches.