Abstract
This study examines Fluctuating Asymmetry (FA) in the isopod Crustacean Asellus aquaticus (Linn.). FA occurs in bilaterally symmetrical traits not closely related to survival or fecundity and is the presence of small random deviations from perfect symmetry caused by environmental or genetic stress. These stresses perturb the developmental programme of the organism involved, resulting in asymmetry. FA was induced in the laboratory with temperature stress. Increasing levels of FA were found with increasing environmental temperature, but alteration between extremes of temperature was not found to be as stressful as simple increases in temperature. Extreme temperatures are, therefore, inferred to be an environmental stress for A. aquaticus.
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