
AI-generated image
Calloplesiops altivelis
Beautiful fish with white spots on black body like a starry sky, plus false eyespot near tail. Hides in rocks with nocturnal tendencies. Uniquely graceful swimmer.
The marine betta, or comet (Calloplesiops altivelis), is a marine fish of the family Plesiopidae found across the Indian and Pacific Oceans. Its black-to-deep-blue body is dotted with white spots like a starry sky, and it bears a large false eyespot (ocellus) near the base of the tail. When threatened it hides its head and presents this false eye, a distinctive defensive behavior thought to mimic the head of a moray eel. It is strongly nocturnal and often shelters among rocks during the day. Slow and graceful in movement and peaceful in temperament, it will nonetheless eat small fish and shrimp that fit in its mouth. Being shy, it settles in well when given a calm environment with ample hiding places.
Source: Wikipedia (CC BY-SA 4.0)
Origin
Coral reefs of the Indian and Pacific Oceans
Lifespan
8-12 years
Size
15-20cm
Temperature
24〜27℃
Carnivore (frozen shrimp, small fish, ghost shrimp)
90cm+. Must provide cave-like hiding spots
Sources: LiveAquaria
Edited & verified by: br-choku editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Sources: CITES Appendices (species not listed) / 環境省 特定動物リスト / 環境省 特定外来生物等一覧
Regulations may change. Always verify the latest information with the relevant authorities.
Find listings for this species
Takes time to train. Start with live food
Will eat small fish and shrimp that fit in mouth
Shy — keep in calm environment. Avoid sudden light changes
Intermediate. This is an intermediate-level species. Some prior experience and knowledge of environmental management are recommended.
The ideal temperature for Marine Betta is 24〜27℃. Avoid sudden temperature changes and maintain a stable environment.
The average lifespan of Marine Betta is 8-12 years. With proper care and nutrition, they can live a long and healthy life.
Marine Betta typically reaches 15-20cm as an adult. Size may vary depending on care conditions and individual genetics.
Marine Betta feeds on: Carnivore (frozen shrimp, small fish, ghost shrimp). Aim for a balanced diet with appropriate feeding frequency.
The price of Marine Betta varies significantly depending on morph, size, and lineage. Check our market price page for the latest pricing information.
Last updated: June 23, 2026