Abstract
This study investigates the osmoregulatory capacities of four mysid species, viz. Mesopodopsis wooldridgei, Rhopalophthalmus terranatalis, and Gastrosaccus brevifissura which occur in different zones along salinity gradients in southern African estuaries, and the psammophilic, surf-zone mysid, Gastrosaccus psammodytes. All four species maintain body fluid concentrations at species-specific levels over a range of environmental salinities. Analysis of Covariance (ANCOVA) indicated no statistical difference in body fluid concentrations among juveniles, immatures, males, and females for M. wooldridgei, R. terranatalis, and G. brevifissura. Available information suggests that biological and physical factors other than salinity are more important in determining spatial distribution of these four species in coastal waters.
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