TIL The candlefish is so rich in oils that when supplied with a wick it can be burned like a candle"

I wouldn't be surprised if it was simply a matter of someone knowing that oil burns and noticing how oily the fish is, then having the brilliant idea of trying to light a fish on fire (alcohol may have been involved).

That's how I like to imagine it, anyway.

"This shit is oily! Hey Bob, can I borrow a match for my pipe?"

Fumbles lit match.

Breakfast is served