Common name: Shy hamlet

General information

The Butter Hamlet, Hypoplectrus guttavarius, is a species of marine fish known for its striking coloration and relatively small size. It is part of the Serranidae family, which includes groupers and sea basses. This species is particularly noted for its yellow body with a distinctive black blotch or 'butterfly' mark on the dorsal fin, which is where it gets its common name.

Hamlets are unique in that they exhibit simultaneous hermaphroditism, meaning individuals possess both male and female reproductive organs and can act as either sex during spawning events.

Care

Butter Hamlets are moderately easy to care for in a home aquarium. They require a well-established tank with plenty of hiding places and live rock for grazing. They are carnivorous and thrive on a diet of small fish, crustaceans, and various meaty foods. It's important to feed them a varied diet to maintain their health and coloration.

Reproduction

Reproduction in Butter Hamlets is quite fascinating. They are simultaneous hermaphrodites and can switch roles during spawning. A pair will typically engage in a courtship dance before spawning, and they release eggs and sperm into the water column where fertilization occurs externally.

Habitat

Hypoplectrus guttavarius is found in the Western Atlantic, from Florida and the Bahamas to the Gulf of Mexico and the Caribbean Sea. They prefer coral reef environments, often seen hovering near reef structures at depths ranging from shallow waters to about 30 meters.

Their habitat preference makes them a colorful and active addition to a reef aquarium, provided their specific care requirements are met.