Common name: Dussumier's wrasse

General information

The Blackedge Wrasse, scientifically known as Halichoeres nigrescens, is a vibrant and active fish that adds both color and dynamism to a saltwater aquarium. It is known for its striking coloration, which transitions from a yellow anterior to a dark, almost black posterior as the fish matures. Juveniles exhibit a more muted color palette, which intensifies with age.

This species is part of the Labridae family, which is known for its members' cleaning behaviors, often picking off parasites from other fish. The Blackedge Wrasse is no exception and can sometimes be observed performing this beneficial service in the aquarium.

Care

Blackedge Wrasses are relatively hardy and adaptable to aquarium life, but they do require a well-established tank with plenty of live rock for hiding and hunting. They are known to jump, so a tightly fitting lid or screen is necessary to prevent escape. These wrasses are carnivorous and thrive on a varied diet of meaty foods, including frozen mysis shrimp, brine shrimp, and finely chopped seafood.

Reproduction

In the wild, Halichoeres nigrescens are protogynous hermaphrodites, meaning they are born female and have the ability to change to male later in life. This change is often triggered by social cues or the absence of a dominant male. In the aquarium, breeding these fish can be challenging due to their complex social structures and reproductive behaviors.

Habitat

The Blackedge Wrasse is native to the Western Pacific, where it is commonly found in coral-rich areas of lagoons and seaward reefs. They prefer environments with plenty of live rock and coral where they can forage and hide from predators. Their natural range extends from southern Japan to the Great Barrier Reef and west to the Philippines and Indonesia.