Considering the effect of evaporation, I think it would be a non-issue. When oceans evaporate they increase salinity, but then rivers will bring that water back

Considering the effect of evaporation, I think it would be a non-issue. When oceans evaporate they increase salinity, but then rivers will bring that water back. The Mediterranean Sea once completely evaporated, leaving a large salt deposit. Later, the Gibraltar barrier broke, allowing water to flood in with new salts, forming a saltier-than-average sea: 3.8 g/100g vs 3.4 in the World Ocean. But that is no problem for marine fauna and vegetation.