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Periophthalmus gracilis, a species of mudskipper, perched on land. Mudskippers are one type of walking fish. A walking fish, or ambulatory fish, is a fish that is able to travel over land for extended periods of time. Some other modes of non-standard fish locomotion include "walking" along the sea floor, for example, in handfish or frogfish.
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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 common mudskipper (Periophthalmus kalolo) is a species of mudskipper native to marine and brackish waters of the Indo-Pacific from eastern Africa to Samoa. This species can be found in mangrove forests where it spends most of its time out of the water. This species can reach a length of 14.1 centimetres (5.6 in) SL. [1]
Like other mudskippers, Boleophthalmus boddarti is capable of moving on land, and uses its pectoral and pelvic fins to move about on the surface of tidal flats in its native range at low tide. The fish is boldly patterned, with rows of blue spots along its flanks and cheeks, as well as dark bands running down its body.
Boleophthalmus birdsongi is the only species of its genus to have a lateral line stripe and lack a lower jaw teeth notch. Compared to the only other Boleophthalmus species to occur in Australia, Boleophthalmus caeruleomaculatus, B. birdsongi is lighter in colouration and has less second dorsal fin and anal fin elements. [1]
The Darwin's mudskipper has a body shape and dorsally pultruding eyes similar to other mudskippers. They have a maximum length of 4.6 cm. It has 5 – 7 dorsal spines, 10 – 12 dorsal rays, 1 anal spine, and 11 – 13 anal rays. Its greatest distinguishing characteristic from other mudskippers is its greatly reduced first dorsal fin in both sexes.
Boleophthalmus pectinirostris, commonly known as the great blue spotted mudskipper, is a species of mudskipper native to the north-western Pacific Ocean. It can be found on the coastlines of Japan , eastern China , Sumatra , Malaysia , Taiwan and the Korean Peninsula .