L u sko v:i. V.: Factors Affecting Haematological Indices in Free-living Fish Populations. Acta vet. Bmo 1998,67: 249-255. The values of physiological indices in fish blood are significantly affected by a complex of factors. Since fishes are poikilothermic, this complex includes the influence of both biological and environmental factors. For a correct interpretation of the observed values of the various haematological indices. the knowledge and consideration is required of the most significant

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... actors that may affect the collection, treatment and, above all. evaluation of data. In investigations of 2 -3 annual cycles of selected indices in the blood of adults of Salmo trulla m.jario. Thymallus thymallus, Chondrostoma nasus, and partial cycles of Leueiscus cephalus and Barbus barblls.