La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Light preferences of red swamp crayfish (Procambarus clarkii)
Auteurs :	Pavel Kozak, Auteur ; Jose Martin Gallardo, Auteur ; Jose C. Escudero Garcia, Auteur
Type de document :	Article
Dans :	Hydrobiologia (636(1) DEC 2009)
Article en page(s) :	499-503
Résumé :	Light intensity preferences of Procambarus clarkii (Girard, 1852) were evaluated in an indoor fiber glass trough, consisting of five equal length (4 m) zones with light intensities varying from dark to 1,000 lux (L), situated at the 'Las Vegas del Guadiana' fish farm in Extremadura (Spain). Four trials were performed, with different light zones set in three at sections of the trough, and the fourth providing a control with one light density (300 L) throughout the trough. Whereas the highest intensity (1,000 L) was preferred in trials 1 and 2, the dimmest condition (D) was favored in trial 3. Crayfish showed a strong preference to both outside ends of the trough, and the "end effect" of the trough on position of the crayfish was found to be stronger than the impact of light intensity.

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