Research on Morphometric Features and Population Density at Crayfish (Astacus fluviatilis) from Danila-Moravita Basin, Caras-Severin County.

Due to scarce bibliographic information on the diversity of crayfish species and habitats, research must be carried out on crayfish body measurements (Astacus fluviatilis). Fykes were used for catching the crayfish and fresh pork liver was used as bait. Body measurements were carried out on 23 crayfish (17 males and 6 females). Also, 18 crayfish juveniles have been captured from lake Danila and Moravita stream. The captured crayfish males in Moravita stream had an average body length of 8.88±0.46 cm and a body mass of 28.53±4.33 g. The captured crayfish females in Moravita stream had an average body length of 7.13±0.11 cm and a body mass of 11.17±0.44 g. The captured crayfish males in lake Danila had an average body length of 10.60±0.52 cm and a body mass of 48.38±8.68 g. The crayfish males in Moravita stream showed an average profile index of 4.27, a flesh index of 37.52% and a fattening index of 3.77%. The crayfish females in Moravita stream showed an average profile index of 4.67, a flesh index of 23.30% and a fattening index of 3.07%. The crayfish males in lake Danila showed an average profile index of 4.34, a flesh index of 21.33 and a fattening index of 3.87%. The crayfish population density was of 49.01 individuals/100 m linear in lake Danila and 34 individuals captured/100 m linear in Moravita stream. [ABSTRACT FROM AUTHOR]