Eightline flasher wrasse

Geographical Origin and Habitat: Paracheilinus octotaenia is endemic to the Red Sea, where it is found in sheltered lagoons, seaward reefs, and coral-rich outer slopes. It typically occurs at depths between 5 and 40 meters. It prefers areas with moderate current and a high density of soft and stony corals, where it swims in loose aggregations consisting of a dominant male and multiple females.

Taxonomy and Morphology: Belongs to the family Labridae and the genus Paracheilinus. It is a small wrasse species, reaching a maximum total length of 8 to 9 cm. It features a streamlined body with large eyes suited for picking zooplankton. Adult males develop elongated, filamentous rays on their dorsal and anal fins, as well as a lanceolate tail fin.

Social Behavior: Peaceful, active, and highly social. Males perform elaborate flashing displays to court females or establish dominance over rival males, during which their colors intensify dramatically to a bright metallic glow. It is non-aggressive toward other species but can be intimidated by boisterous tankmates.

Coloration and Sexual Dimorphism: The body features a vibrant orange-red background color decorated with eight horizontal, iridescent blue-violet stripes. Sexual dimorphism is highly pronounced: males are larger, possess much brighter colors, and have long fin filaments, whereas females are smaller, have a duller coloration, and lack filamentous fins.

Aquarium Setup: Needs a reef aquarium of at least 150 liters with plenty of open swimming space in the middle of the water column. Provide ample live rock arranged with caves and overhangs for nighttime shelter. A tight-fitting lid or mesh screen cover is mandatory, as this fish is a notorious jumper when startled.

Diet and Feeding: A planktivore that needs to be fed small portions 2 to 3 times daily. Provide a varied diet of frozen foods such as mysis, brine shrimp, copepods, and fish eggs, alongside high-quality marine flakes and micro-pellets. Feeding high-carotene foods helps preserve their intense colors.

Water Quality: Requires stable marine water conditions: temperature of 23 °C to 27 °C, pH of 8.1 to 8.4, specific gravity of 1.020 to 1.025. Strong water movement and high dissolved oxygen levels are beneficial. Perform regular water changes to keep nitrate levels below 15 ppm.

Compatibility and Cohabitation: Excellent reef-safe community fish. It is best housed in a harem setting with one male and two or more females (females should be introduced first). Compatible with peaceful fish like gobies, firefish, and small cardinals. Avoid aggressive tankmates like dottybacks or large damselfish.

Aquarium Breeding: Breeding in captivity is rarely documented. Spawning occurs in mid-water at dusk, releasing pelagic eggs. The tiny, fragile larvae require specialized live micro-foods and are very difficult to raise successfully under aquarium conditions.

Risks and Diseases: Prone to physical injury or death from jumping out of uncovered aquariums. They can also suffer from shipping stress and external parasites such as Ich. Like other wrasses, they secrete a protective mucus cocoon at night to sleep in, which should not be mistaken for illness.