Oxygen conditions were determined for rearing carp (Cyprinus carpio L.) larvae in 33.1 ± 0.3°C. They amounted to: 96.1, 119.6 and 167.7% saturation of water with oxygen in optimal conditions 43.0 and 60.6% for the required conditions, and 23.1% for the critical conditions.
Genetic variability of three sympatric crucian carp ( Carassius carassius ) populations from NW Poland was studied within a research project aimed at assessing the utility of those populations for stocking in inland waters. DNA samples were collected from 65 individuals. Restriction analysis was performed using 4 enzymes (HaeIII, HinfI, FspBI, TasI) of known restriction sites. The restriction pro files obtained were classified as belonging to a single haplotype (H-1). Selected DNA products were sequenced; the subsequent comparison made it possible to detect the presence of substi- tutions in the genome fragment analysed.