Very Rare Roman 300-400 AD Bronze Fish

This is a very rare historical Imperial era unique artefact from an expert in medieval items and verified by a museum as an Roman 300-400 AD Bronze fish approx 3” long with original patina as found by a metal detector, a nice collectible historical interest. I’ve bought and sold Roman fish hooks but this is a very first bronze fish that I’ve ever acquired or seen. An unusual and very very early collectible fish design item.