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The white sucker is a long, round-bodied fish with a dark green, grey, copper, brown, or black back and sides and a light underbelly. The fish also has typical features of primitive Cypriniformes fishes, such as a homocercal tail, cycloid scales, and dorsal, pectoral, and pelvic fin rays. [5]
The mouths of these fish are most commonly located on the underside of their head (subterminal), with thick, fleshy lips.Most species are less than 60 cm (2.0 ft) in length, but the largest species (Ictiobus and Myxocyprinus) can surpass 100 cm (3.3 ft).
The white suckerfish can reach 30 cm (12 in) in standard length. The adhesive disk is short and wide, the length 34-40% and the width 22-26% of the standard length, with 13-14 lamellae . The pelvic fins are placed far forward and narrowly attached to the abdomen; the dorsal , anal , and pectoral fins are short with reduced rays.
The northern hogsucker (Hypentelium nigricans) is a freshwater ray-finned fish belonging to the family Catostomidae, the suckers.It is native to the United States and Canada where it is found in streams and rivers.
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The sucking disc is covered in tiny hexagons and each of these consists of many microscopic hair-like structures . This is similar to the structures that allow geckos to cling to walls. The sucking disc can be remarkably strong, in some species able to lift as much as 300 times the weight of the clingfish. [ 13 ]
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The longnose sucker has a circular suction disc (large lips) on the ventral side, located near the mouth. These large lips are an adaptation that allows the longnose sucker to attach itself to rocks and other substrate types in a fast-moving environment. The longnose sucker also has large and prominent scales that cover the body.