Hoplias aimara, also known as anjumara, traíra, trahira, manjuma, anjoemara and wolf fish, is a species of freshwater fish found in the rivers of South America.
This is the largest of the Hoplias species with fish caught at a length of 120 cm (47 in), the largest rod and reel record stands at 101 cm (40 in). They can weigh as much as 40 kg (88 lb). This species has an elongated cylindrical shape. The color is generally brown with a lighter base color, although this can vary, with vertical patches or stripes. There are normally small spots visible on the upper anterior part of the body including the head, the patterning can vary geographically. The color can be almost solid black through to a pale brownish gold color with dark stripes. Although it seems docile, the fish has been known to attack divers and swimmers, however there is rarely a fatal ending.
Wolf fish can be found across most of northern South America, Brazil, Colombia, Venezuela, Guyana, French Guiana, Suriname and the island of Trinidad. Often found in counter current zones of principal rivers and creeks. It is mainly an ambush predator of fish but also feeds opportunistically on other animals that fall into the water such as terrestrial invertebrates.
