Activity of noble crayfish (Astacus astacus) and spiny-cheek crayfish (Orconectes limosus) under the laboratory coditions

Activity of noble crayfish (Astacus astacus) and spiny-cheek crayfish (Orconectes limosus) under the laboratory coditions University of South Bohemia České Budějovice - Faculty of Agriculture, Department of Fisheries Author: Martin Musil Contact: mue.@seznam.cz Abstract: Some authors point out, that the American species are more activated than European during the day. Noble crayfish (Astacus astacus L.) is the night animal. Spiny-cheek crayfish (Orconectes limosus Raf.) is the most agresive species with more activity during the day, whose is of itself ecologic and reproductions characteristic typical r{--}strategist. And over than above it is a vector of crayfish plague. Objective of this study was the observe the daily and noctural of both species, the influence of fish predators and murmurs of agresivity. The bulk of this work was in ethologic laboratory with using videotechnic in control conditions and directed lightregimen. The findings see the big diference between species, that the spiny-cheek crayfish is more activated that the noble crayfish (51,4%{$\pm$}4,33 of the 24 hour activity) with slight diference between the day and night. Someones of the subjects don´t look for the cover during the experiment, it were mainly the females, whose activity were better than the male. Noble crayfish embodied low aktivity (15,1%{$\pm$}8,22 of the 24 hour activity) with more highly diference between the day and night and with slight diference between the sex. The inherence of the fish predator have had slight influence on the both species, rather sometimes take on the crayfish attention. The agresivity of the both is at least comparable, so it isn´t clear, that the spiny-cheek crayfish would be more successful in proximate competetion without the infection of crayfish plague