Trippy fish out of its habitat

This week, off the coast of Britain, a fisherman caught a fish called sarpa salpa. Though it is easily identifiable by those who know about it, the fisherman had no idea what it was. That's because it's native to the coast of Africa, and this particular fish was far out of its normal range. It could have simply been caught up in another shoal of fish, but it's also possible that it is one of many that are expanding north as water heats up due to climate change. The sarpa salpa in particular is a risk to uninformed Brits, because eating certain parts of it (the head in particular) causes svere halluncinations. People have been hospitalized with auditory hallucinations and dramatic nightmares as a result of eating unhealthy parts of the sarpa salpa.
As for the fisherman who caught this specimen, he says if he'd known what it was, he'd have taken it to a club and sold it.