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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.
The aim of the study was to analyze the impact feeding has on the biometric characters of Crucian carp, Carassius carassius. Juvenile crucian carp were reared for 56 days in a recirculating aquaculture system (water temperature 24°C) and fed dried Chironomidae larvae (group O), commercial feed (group P), and a mix of these two feeds (group M). The type of feed has a significant impact on most of the biometric characters studied. Only the relative head size and head height were similar in all the feeding groups studied (P > 0.05). Discrimination analysis confirmed that the characters that most statistically significantly characterized the differences among the Crucian carp feeding groups studied were body height and tail stalk length.
Fishery and aquaculture play an enormous role in reducing poverty and alleviating food insecurity at household level. The first fish stocking program in Ethiopia was reported as early as 1925. Indigenous Oreochromis niloticus, Tilapia zilli, Clarias gariepinus and non-native Cyprinus carpio, Carassius carassius, Carassius auratus, Ctenopharyngodon idella and Salmo trutta fish species were used for stocking. Even though most of the fishery enhancement programs are low-cost operations, they often seem to be very efficient actions. Fish harvested in the reservoirs Fincha and Amerti in Oromia region, lakes Haik and Ardibo in Amhara region and Hashengie in Tigray region, enhanced by stocking, contribute up to 15% of the annual fish production of the country. Thus fisheries programs challenging the growing protein-rich food demand should be considered as a necessary and valuable aspect of management strategy in all waters, independently from its major operational goal like hydropower or irrigation.
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