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The aim of the experiment was to examine prey size selection of peled (Coregonus peled Gmel.) larvae using Strauss linear index for food selection. For this purpose larval peled were held in illuminated cages at two stocking densities (10 000 and 40 000 individuals per cage) in three water bodies of diverse trophic characteristics. In the first days of rearing peled larvae fed on zooplankton up to...
The study was completed on the basis of the results of commercial fish catches from lakes in Northeastern Poland. The number and status of the pikeperch lake habitats were determined in 14 river basins in this part of Poland, as recorded in 1951-1994. The river basins differed in the potential of the lakes inhabited by this predatory fish. The highest percentage of such lakes relative to all lakes...
The (11Bu+) energy of synthetic 15-cis β-carotene exhibits a linear dependence on (n2-1)/(n2+2) in non-polar and polar solvents; in this it is similar to (that of) all-trans β-carotene. The point of intersection is at (n2-1)/(n2+2) = 0.3 for both isomers. The microenvironment of 15-cis β-carotene in the Photosystem II reaction center was established as having a mean refractive index 1.473. Persistent...
Long-term studies on catches from 757 lakes in northeastern Poland served to analyse fishery exploitation parameters available from the records in lakes books. Yield (kg.ha-1), annual frequency of exploitation and relative catch (kg.ha-1.month-1) were analysed in five size classes of lakes, together with the relations occurring between these parameters. Linear correlation was determined between yield...
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