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A Comparative Study of Selected Physical Aspects of the Eggs of the Crayfish Procambarus Clarkii (Girard, 1852) and P. Zonangulus Hobbs & Hobbs, 1990 (Decapoda, Cambaridae)

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Certain physical aspects of eggs from the crayfish Procambarus clarkii and P. zonangulus were studied. Fecundity, both potential and actual, is greater in P. clarkii, while the size (diameter) of extruded eggs is considerably less. Counts of oocytes indicate that egg production in P. zonangulus is partitioned among all size classes of the reproducing population, while in P. clarkii, the major reproductive responsibility is with the largest individuals. P. clarkii exhibits a profligate reproductive strategy, one better adapted to warm water habitats where nutrient flow is continuous. P. zonangulus has a prudential reproductive strategy, one better adapted to cool water habitats in which nutrient flow is pulsed.

Affiliations: 1: Department of Biology, The University of Memphis, Memphis, TN 38152, U.S.A.

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