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Bothus lunatus has a laterally flattened body and orientates itself so that its right side is underneath and its left side is uppermost. Both eyes are on this upper surface and project on short thick stalks. The body shape is rounded and the dorsal and anal fins nearly surround the body. The former has 92 to 99 soft rays and the latter 71 to 76. The pectoral fins are long and often erect. An average adult length is about 35 cm (14 in), with a maximum length of 46 cm (18 in). The upper surface of this flounder is some shade between grey, brown and tan with small blue spots and circular blue markings, the head and fins also being spotted and speckled with blue. There are two or three rather diffuse dark patches on the lateral line. The fish can vary its background colour to make it closely resemble that of its surroundings and thus camouflage itself as it lies on the seabed. Fish in this genus are able to change their colouring in two to eight seconds. In the West Indies, Bothus lunatus largely feeds on fishes, which make up 85.7% of its diet by volume, and particularly on herrings in the genus Jenkinsia and the bigeye scad (Selar crumenophthalmus). Another 11.4% of its diet consists of mantis shrimps and 2.9% of octopuses. Bothus lunatus is believed to be an ambush predator, lying concealed on the seabed before darting out to catch any unwary prey that moves too close.
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