Prevent AI from clipping certain objects

I noticed that players don't clip through walls or pipes placed in water, but AI swims right through them as if they did not exist. Is there an editor object that AI never clips through that I could place near these objects and turn invisible?

That would keep the pesky AI from passing through solid objects, if such a barrier object exists.

Same question for the Trawler object, but with the Trawler, AI and the Player both pass right through it.

Thanks!