Role in the series
A regular Hairfish appeared where Sebastian will never be forgiven by Urchin once it ate the trophy. Urchin got mad at him that he will never forgive it. Later when the gang arrives to the Fortune Teller to find out how to break the curse, the orb she shows them features a school of silver fish turning it into normal.
Another variant of the species is a blood-red colored variant and is actually Flounder who was cursed after feeling a "little hairy". He started to attack the village and the villagers form an angry mob to capture him for the destruction. Flounder starts to repel himself from the great white sharks; after that, he reverted back into his normal self and the mob captured him, putting Flounder in a cage inside a sunken ship.
In the cage, Flounder turns into a Howling Hairfish again and started to rampage. Ariel used a school of silver fish to enter the sunken ship as the mob is tumbling down the ship, as the silver fish turned the Howling Hairfish back into Flounder, as the villagers cheer, breaking the curse. As a result, Flounder no longer transforms back into the monster he frequently transforms into, thanks to the silver fish that helped break the curse.