We do not currently know of any antonyms for bergall.
The noun bergall is defined as:
A species (or specimen of that species) of wrasse native to the western Atlantic, inhabiting inshore waters near the sea floor at depths of 10–128 metres (33–420 feet) and at latitudes of 36°–49° north, and reaching up to 38 centimetres (15 inches) in total length and up to 1 kilogram (2·2 pounds) in weight; Tautogolabrus adspersus.