Abstract

Investigations on the movement of individual crayfish supply important information on the spatial structure of stocks, habitat preference, small-scale and large-scale movements and the impact of disturbances of various kinds on behaviour. By means of small aquatic transmitters, individual Astacus astacus were tracked in their natural habitats over several weeks. Both males and females were observed in the field in their home ranges at seasons and during the mating and breeding periods, and also in different habitats. In addition, the movements of crayfish in response to various impacts were studied. Residential behaviour of individual crayfish is influenced by individual well-being and habitat familiarity. Activity range and motion pattern vary in males and females with seasons and reproduction cycle. Habitat selectivity is delicate showing preference for heterogeneous small-scale structures and hard bottom materials. Short-term reactions to impacts like food and changes of flow are distinct. Exposure to electric fishing increases the rate of emigration and thus might harm small populations. Motion and activity patterns are sensitive indicators of the condition of crayfish and the situation of local populations.

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