Queen coris
A vibrantly colored wrasse from the Indian Ocean.
The queen coris (Coris formosa), also called the sand wrasse, queen coris wrasse, Formosan coris, Formosa coris wrasse, Formosa wrasse, Indian Ocean wrasse, or Indian sand wrasse, lives in the Indian Ocean, ranging from the Red Sea and the east African coast to Sri Lanka. Its bright colors make it popular in the aquarium trade.
Adults inhabit neritic oceanic coral reefs at depths between 2 and 50 meters, preferring tropical waters from 24°C to 27°C. Juveniles are often found in tide pools, while adults usually stay in rocky and coral areas, sometimes among vegetation. The species is distributed across the western Indian Ocean, the southern Red Sea, South Africa, and east to Sri Lanka.
The queen coris looks similar to *Coris gaimard*. Young fish measure about 20 cm, but adults can grow up to roughly 60 cm. Coloration follows three main patterns. Generally, the fish is reddish to lavender with a striking, vibrant appearance. Adults are blue-greenish with dark edges and dark blue spots, mainly toward the tail, and a red-orange line on the tail’s posterior margin. Toward the snout, adults show bright, light blue lines. The fish has nine dorsal spines, twelve dorsal soft rays, and three anal spines. Juveniles are orange and brown on the underside, with long white spots on the upper body, resembling a clownfish’s coloring. Blue features develop in adulthood. Color variation may depend on depth, but it mainly comes from differences between juvenile and adult stages. Color is crucial for display—used to attract mates and in male combat. The fish has small protruding teeth for feeding, mostly on hard-shelled organisms.
Queen coris feed on hard-shelled prey like crustaceans (shrimps, crabs, and amphipods) and echinoderms (sea urchins and small molluscs). As adults, their teeth become efficient at breaking hard shells, and they can be aggressive and destructive. Young feed on smaller organisms like krill until they can handle hard-shelled prey.
Like most fish, the queen coris is oviparous, producing offspring from eggs. It is protogynous, meaning it can change from female to male. A female’s reproductive parts develop before the male’s, and populations are mostly female. When a male is needed, one female switches gender for reproduction. The species displays polygamy or distinct pairing during breeding.
Quick Facts
- Taxon
- Coris formosa
Facts from the source article.
Lore & Background
Adults of this species inhabit neritic oceanic coral reefs, found at depths from 2 to 50 m in tropical waters within 24°C to 27°C. Juveniles are commonly found in tide pools, while adults occur in rocky and coral areas, sometimes in vegetation. The species is distributed along the Western Indian Ocean, Southern Red Sea, South Africa, and east to Sri Lanka.
Similar in appearance to Coris gaimard, the queen coris can measure between 20 cm when young and up to approximately 60 cm. Its coloration varies within three different patterns, generally reddish to lavender in vibrant color. Adults appear blue-greenish with dark edges and dark blue spots covering the body, mainly towards the tail, with a red-orange line on its posterior margin. The adult also displays vibrant, light blue lines towards the rostrum. Juveniles are orange and brown on the bottom with long white spots on the dorsal part, resembling a clown fish's color. It is hypothesized that color variation depends on depth, but mainly results from differences between juvenile and adult stages. Color is crucial for display, attracting mates and in combative relationships between males.
The queen coris is a very aggressive species, especially males during mating season. It can be a threat to smaller fish and is an effective invertebrate hunter. In aquariums, it has a habit of rearranging sand and rocks and digging itself down in sandy substrate, possibly for breeding, foraging, sleeping, or creating a home. It is a solitary fish and is extremely destructive in captivity, especially when large. It requires much space for swimming and tends to hide under sand during acclimatisation; when too large for a tank, it hides in small cracks between coral or rocks.
Reader's Guide
The queen coris is of minor importance to local commercial fisheries and is also found in the aquarium trade. The species occupies the category of least concern, with the aquarium trade posing the major threat to the species. However, this trade currently does not cause serious harm to the species, and there is currently a very low risk of extinction. The fish have small protruding teeth for feeding mostly on hard-shelled organisms. Their diet includes crustaceans such as shrimps, crabs, and amphipods, and echinoderms such as sea urchins and small molluscs. As their teeth develop in adulthood, they become very efficient at predating hard shells and can become very aggressive and destructive. Young feed mainly on smaller organisms like krill until they grow able to prey on hard-shelled organisms. Similar to most fish, the queen coris is oviparous, producing offspring from eggs. It is a protogynous fish, meaning it is semi-hermaphrodite and can change gender from female to male. A female's reproductive parts develop before its male parts, and populations are mainly female. When a male is needed, one female switches over to male for reproduction. Queen coris display polygamy or distinct pairing during breeding; males are dominant and usually in charge of a large female harem or various harems, especially during reproduction, even though the species is solitary. It is hypothesized that males pursue females by swimming alongside them, fluttering their fins.
Did You Know?
- The queen coris is also known as the sand wrasse, Formosan coris, and Indian sand wrasse.
- Adults can grow up to approximately 60 cm, while young measure around 20 cm.
- It is a protogynous fish, meaning it can change gender from female to male.
- The species is of least concern, with the aquarium trade posing the major but currently non-serious threat.
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