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Atlantic blue tangs act as cleaners by grazing algae as well as eating molted skin and parasites off of the client's flesh once the client comes to the cleaning station. The most common client in these interactions is the green turtle , in which the blue tang inspects the green turtle by nipping its head, limbs, tail, and carapace .
Mudskippers can grow up to 30 cm (12 in) long, and most are a brownish green colour that ranges anywhere from dark to light. During mating seasons, the males will also develop brightly coloured spots in order to attract females, which can be red, green or blue. Unlike other fish, the mudskipper's eyes protrude from the top of its flat head.
The fish has long filaments along the middle of its head, which are, in fact, the detached and modified three first spines of the anterior dorsal fin. The filament most important to the angler is the first, which is the longest, terminates in a lappet, and is movable in every direction.
When considering a tang for an aquarium it is important to consider the size to which these fish can grow. Larger species such as the popular Pacific blue tang surgeonfish (of Finding Nemo fame), Naso or lipstick tang, lined surgeonfish , Sohal surgeonfish and Atlantic blue tang surgeonfish can grow to 40 cm (16 in) and require swimming room ...
Glaucus atlanticus is the blue sea slug shown here out of water on a beach, and thus collapsed; however, touching the animal directly with your skin can result in a painful sting, with symptoms similar to those caused by the Portuguese man o' war The slug in the water
Purple with a black mask beginning at the mouth and ending at the base of the dorsal fin. 6 cm (2.4 in) Blue assessor: Assessor macneilli: Yes: Entirely navy blue with white edging of the dorsal fin. 7 cm (2.8 in) Royal gramma: Gramma loreto: Yes: Purple head and anterior, abruptly changing to yellow about halfway down the body.
A parrotfish is a large, dark blue fish with a light blue underbelly and a protruding forehead. A cardinal fish , a brown fish with three vertical black stripes, black outlining on the caudal fin and caudal peduncle, and covered in white spots.
The variation ("polymorphism", in this case, a "color morph") most commonly found is pure blue, dark blue, or light blue, although observers find the aqua, purple, or orange variation throughout the ocean. These sea stars may grow up to 30 cm (11.8 in) in diameter, with rounded tips at each of the arms; some individuals may bear lighter or ...