[LiberalGunNut]

(Fish and insects didn't need to go on the ark.)

Are you saying ants, grasshoppers, cockroaches etc etc can survive underwater?

And what about Freshwater Fish? How can they survive in saltwater?

[DungeonMaster]

Are you saying ants, grasshoppers, cockroaches etc etc can survive underwater?

As eggs.

And what about Freshwater Fish? How can they survive in saltwater?

Either as eggs or in water that is not normal ocean water. The water landing over land was fresh.

[Elsie]

Are you saying ants, grasshoppers, cockroaches etc etc can survive underwater?

The can survive floating on debris...

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And what about Freshwater Fish? How can they survive in saltwater?

I imagine that 'fountains of the Deep' would be fairly fresh; don't you?