Fish atlas

Geographical Origin and Habitat: Red Sea, Indian Ocean and western Pacific. They inhabit spectacular reef drop-offs and coral pinnacles exposed to strong ocean currents, forming clouds of thousands of individuals.

Taxonomy and Morphology: Lyretail Anthias (Pseudanthias squamipinnis). The queen of the reef (Serranidae). Hydrodynamic body, terminal mouth to catch plankton on the run. The name "Lyretail" derives from the majestic lyre-shaped tail (forked with long extensions).

Social Behavior: Hierarchical and diurnal school. They are not solitary fish: they need a group (Harem) of at least 5-8 specimens. The dominant male hovers above the females, performing continuous choreographies (U-Dives) to defend the territory.

Coloration and Sexual Dimorphism: Protogynous hermaphrodites (sex change). Females are bright sunny orange-yellow with a blue-purple line (eyeshadow) across the eye. The dominant male changes radically: he becomes intense fuchsia-reddish, with the first ray of the dorsal fin extended like an antenna and a square spot on the pectoral.

Aquarium Setup: Large and turbulent Reef (Minimum 120 cm / 48 inches). They need a huge amount of space for free swimming in the column and currents generated by very powerful wavemakers. Open rockwork with crevices to sleep at night.

Diet and Feeding: The Planktivore's Curse. In nature they pick plankton every 5 minutes. In the tank they MUST be fed at least 3-4 times a day with Mysis, Calanus, lobster eggs or brine shrimp nauplii. If fed only once a day, they waste away rapidly and die (Fading).

Water Quality: The water must be pristine (very low nitrates and phosphates), which conflicts with the need to throw huge amounts of food into the tank 4 times a day. High-performance Skimmers are the only solution.

Compatibility and Cohabitation: Perfect community fish (100% Reef Safe). They ignore corals and invertebrates. The only aggression is intraspecific: NEVER insert two males in the same tank, they will kill each other for control of the females.

Aquarium Breeding: Very complicated. Although they form stable harems and lay pelagic eggs in the aquarium at sunset (darting to the surface), raising the microscopic larvae requires live copepod cultures almost impossible to manage at home.

Risks and Diseases: Hierarchy Collapse. If you buy a group of only "juveniles", the largest female will turn into a male in 2-3 weeks. But if the dominant male dies, another female will change sex. During this transition, the new leader becomes ruthlessly aggressive, sometimes causing the subordinate females to die of stress.