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Some parameters of spawning redds and the emergence of lake trout fry were investigated at spawning areas in the upper Wda River system. Redds were located and selected in late fall 2003 and a few of their parameters were identified, i.e., dimensions, water velocity, and grain fraction content. The sand content varied in particular redds from 5.1 to 24.8%. Fry was captured with traps at five of the...
The aim of this study was to determine the impact of the size and age of cultivated female lake trout on the size of their eggs. The material was collected from 1995 to 1999 at the Olszówka Fish Farm in southern Poland. Eggs were obtained from 310 trout females with a total length range of 30-53 cm (fish aged three to seven years). Following the hardening phase, the maximum and minimum diameters of...
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