jewfish
Jewfish (noun) means any of several large fish, mostly groupers or fish that look similar to them.
Etymology
For Australian fish such as Argyrosomus species, jewel and fish; see jewie. For New World species, from 17th century Jamaican English and refers to the kosher status of the Atlantic goliath grouper from at least 1697 onwards, likely as a derogatory term despite Jamaican Jews being treated better in the rule of the English than the Spanish rule.