| Summary: | In order to draw implications for ballast water management, wetested the tolerance of two Ponto-Caspian mysid species <i>Paramysislacustris</i> and <i>Limnomysis benedeni</i> to sudden salinitychanges. The naturally stenohaline <i>P. lacustris</i> was more susceptibleto higher salinities; its mortality rate at 19 PSU was 60%,whereas exposure to 23 PSU was 100% lethal. The euryhaline <i>L.benedeni</i> survived in salinities of up to 19 PSU, but experienced100% mortality at 34 PSU. The return of both mysid species tofresh water after the 24 h exposure to higher salinities didnot prevent further mortality. Considering the rather high short-termsalinity tolerance of both species, a salinity of at least 30PSU should be used as an appropriate biocide.
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