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.... you mean fish? Of course they can smell things, sharks for example are notorious for smelling blood from very far away.

If you are asking about non-aquatic animals, they can breathe as little underwater as you can.

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Do sharks have noses or are their olfactory receptors somewhere else?

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If I stick my hand in my reef tank, the fish that were already staring at me like they had never been fed in their entire lives will swim toward my hand. If I put in brine shrimp, all the fish, including the ones that were hiding in the rocks will come out quickly.

Sharks have nostrils in their snout, right where you’d expect them to be.

What are some animals that have olfactory receptors where we don't expect them?