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Conspicuous coloration is a method used by some cleaner fish, where they often display a brilliant blue stripe that spans the length of the body. Other species of fish, called mimics, imitate the behavior and phenotype of cleaner fish to gain access to client fish tissue.
It is not known whether the false cleanerfish adopts a permanent color pattern or if it alters its coloration to mimic the appearance of neighboring cleaner wrasses. One major difference in appearance between the false cleanerfish and its model is the location of the mouth.
Cleaner wrasses are the best-known of the cleaner fish. They live in a cleaning symbiosis with larger, often predatory, fish, grooming them and benefiting by consuming what they remove. "Client" fish congregate at wrasse "cleaning stations" and wait for the cleaner fish to remove gnathiid parasites, the cleaners even swimming into their open ...
The spotted tail and fin pattern of the sweetlips signals sexual maturity; the behaviour and pattern of the cleaner fish signal their availability for cleaning service, rather than as prey. Bright coloration of orange elephant ear sponge, Agelas clathrodes signals its bitter taste to predators.
There are three factors to coloration, brightness (intensity of light), hue (mixtures of wavelengths), and saturation (the purity of wavelengths). Fish coloration has three proposed functions: thermoregulation, intraspecific communication, and interspecific communication.
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The best known cleaning symbioses are among marine fishes, where several species of small fish, notably of wrasse, are specialised in colour, pattern and behaviour as cleaners, providing a cleaning and ectoparasite removal service to larger, often predatory fish.
Fowlerella bicolor (Fowler & B.A. Bean, 1928) Labroides bicolor is a species of wrasse endemic to the Indian Ocean and the Pacific Ocean. It is known by various names including bicolor cleanerfish, bicolor (ed) cleaner wrasse, cleaner wrasse, two-color cleaner wrasse and yellow diesel wrasse .
Large females and some males can permanently change coloration and/or sex and enter the terminal phase coloration, which has a blue head, black and white bars behind the head, and a green body. This color phase gives the species its name.
The size of the goby varies depending on sex, with females being typically smaller than males, and their geographical location as well as their role as a cleaner goby also has impacts on their morphology. Due to their bright coloration and lack of aggression, the species is commonly found in the aquarium trade.
Four of six cleaner species of the genus Elacatinus display such coloration—E. oceanops, E. evelynae, E. genie, and E. prochilos. E. puncticulatus and E. nesiotes engage in cleaner activity, but do not possess blue stripes.