Abstract

Molting and spatial distribution of soft (less than 24 hr since molt}, paper shell (24 to 48 hr since molt}, and intermolt (more than 48 hr since molt) crayfish (Procambarus clarkii) were observed for 2 months in 18 groups of 40 individuals that were stocked at a density of 53/m² in 0.75 m² pools with a single two-compartment shelter. Molt condition and location of each crayfish in the pools were recorded on 2 successive days. Crayfish held individually in the same system were observed through molting on 10 occasions. Crayfish in groups molted in the open rather than in shelter. Chi-square analysis of the data showed that the distributions of postmolt (soft and paper shell) crayfish and intennolt crayfish were not proportional to the surface area in the open pool or shelter. During daylight hours, soft and paper shell crayfish were usually found in the open (though often near the entrance to a shelter), but intermolts were usually within shelter. Crayfish held individually molted either in or out of shelter but were found in shelter during daylight while experimenters were active in the laboratocy.

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