Impact of selected abiotic and biotic factors on the results of rearing juvenile stages of northern pike Esox lucius L. in recirculating systems
2009
Szczepkowski, M.,Inland Fisheries Institute, Olsztyn (Poland). Experimental Fish Hatchery Dgal
The impact of selected parameters (water temperature, light intensity, feed ration and granulation size, daily feeding period, stocking density, tank shape, sorting, covering the rearing tanks) on the rearing indices of northern pike, Esox lucius L. was studied. The impact of these factors on the intensity of cannibalism was determined, as was their role at various stages of early northern pike development. The study results presented indicate that the factors that most influence the results of rearing include water temperature, the type of tank used, fish sorting, and the size of the daily feed ration. The optimal water temperature for growing juvenile specimens of northern pike is 28 deg C, but effective rearing can be achieved within a temperature range of 20 to 28 deg C. The greatest problem in rearing northern pike juveniles was cannibalism, but sorting had a positive impact on the survival of fish. Lighting and feed grain had the least influence on the rearing results
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