Common name: McCosker's flasher

General information

McCosker's Flasher Wrasse, scientifically known as Paracheilinus mccoskeri, is a vibrant and active fish that adds both color and dynamism to a reef aquarium. These small, ornate wrasses are known for their spectacular display during courtship, where males flash their fins and intensify their colors to attract females. The species is named after John E. McCosker, a notable ichthyologist.

Care

McCosker's Flasher Wrasse requires an established aquarium with plenty of live rock for hiding and hunting for small invertebrates. They are peaceful fish that do well in a community tank but should not be kept with large, aggressive fish that may bully or eat them. A tight-fitting lid is essential as these wrasses are known jumpers. They thrive on a varied diet of meaty foods, including frozen mysis shrimp, brine shrimp, and quality marine flake and pellet foods.

Reproduction

In the wild, these wrasses form harems consisting of one male and several females. Breeding in captivity is rare, but environmental stability and a well-maintained tank increase the likelihood of observing their unique mating rituals. If a male is lost, the dominant female may change sex to become the new male, a process known as protogyny.

Habitat

McCosker's Flasher Wrasse is found in the Western Pacific, from Indonesia to the Solomon Islands, and north to the Ryukyu Islands. They prefer coral-rich areas and slopes, typically at depths ranging from 5 to 40 meters. In the aquarium, they require similar conditions with plenty of live rock and a sandy substrate.