Are you just saying that there are poisonous deep sea fish? To be a counterexample it needs to be a poisonous fish that exists in shallow waters but whose olde

Are you just saying that there are poisonous deep sea fish? To be a counterexample it needs to be a poisonous fish that exists in shallow waters but whose older members only occupy deep waters. Entirely deep-sea species aren't what this article is referring to. I'm not aware of any poisonous fish that aren't hunted by humans that follow this pattern. Just saw your edit. I don't think that sunfish fish of different ages spend their time at different ocean depths? Wasn't mentioned on wikipedia.