The ability of an aquatic organism to tolerate wide salinity
variations without compromising life processes is termed
euryhalinity. This capability requires physiological,
biochemical and ecological adaptations. Strategies permitting
euryhaline decapods to inhabit aquatic environments with
variable salinities have been studied almost exclusively in
adults. Although also larval stages have recently received an
increasing attention, the salinity tolerance of embryonic stages
has remained little known (1). Embryos, larvae and adults of the
shrimp Palaemonetes argentinus tolerate a wide range of
salinities (1-~25), but osmoregulatory capacities have been
demonstrated only in post-embryonic developmental stages (2; 3).
As in most other crustaceans, little has been known about
osmoregulation during the embryonic phase. Helmholtz Research
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