iano writes:
how do you kill all aquatic life using water as a medium of destruction?
Bury it under continents' worth of silt and debris?
Crush it with depth so great (enough to cover mountains, after all) that no fishies can survive in their usual habitat?
Suffocate it by washing so much organic material into the oceans that aerobic decay eats up all the dissolved oxygen?
AbE: Beat me to it, Coragyps!
Edited by Omnivorous, : Nod to Coragyps.