Acta Ichthyologica et Piscatoria 19(2): 3-19, doi: 10.3750/AIP1989.19.2.01
Age and growth-rate of grayling Thymallus thymallus (L.) in the rivers of Pomerania (NW Poland)
expand article infoA. Witkowski, J. Błachuta, J. Olesińska

Corresponding author: A. Witkowski

© A. Witkowski, J. Błachuta, J. Olesińska.
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Citation: Witkowski A, Błachuta J, Olesińska J (1989) Age and growth-rate of grayling Thymallus thymallus (L.) in the rivers of Pomerania (NW Poland). Acta Ichthyologica et Piscatoria 19(2): 3-19. https://doi.org/10.3750/AIP1989.19.2.01
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Abstract
The studies were carried out on the material of 308 individuals from 18 upland river of moraine character, in north-western Poland. The growth rate, growth intensity, condition factor and the dependence between body weight and total length were estimated. It has been found that the graylings from north-western Poland live longer and grow quicker than those from mountain rivers in southern regions of the country, and also in other parts of Europe.