4. Otters will mainly feed on fish (40-90% of their diet)and will take a variety of species depending on the time of year, species such as carp, stickleback and eels. Otters catch with their whiskers. Incomplete webbing between the toes gives them a great deal of manual dexterity. (River otters eat a less-impressive, but still-respectable 15-20% of their body weight.) This species is a member of the otter subfamily (Lutrinae) of the weasel family (Mustelidae), and is the smallest otter species in the world. The territory used by an otter can be 50 miles of shoreline. To sustain a captive population of Asian small-clawed otters, the nutritional needs of the species must be met. River otters and giant otters hunt by using their whiskers to detect movements of prey in murky water. River otters eat a variety of aquatic wildlife, such as fish, crayfish, crabs, frogs, birds’ eggs, birds and reptiles such as turtles. There are a variety of meat products upon which to base the diet. During the spring months amphibians form a large part of their diet. What do otters eat? The Asian small-clawed otter (Aonyx cinereus), also known as the oriental small-clawed otter or simply small-clawed otter, is a semiaquatic mammal native to South and Southeast Asia. Husbandry, or the care and management of otters in captivity, has improved gradually over the last two decades. Asian small-clawed otters use their forepaws rather than their mouth to locate and capture food items. Young otters will often follow their mother about on land or while swimming in single file. River otters eat mostly frogs, crabs, crayfish, fish and mollusks. Diet. Otters tend to eat up small fish in entirety from head to tail. River otters may live 20 years in captivity; few survive more than 10 years in the wild. They have also been known to eat aquatic plants and to prey on other small mammals, such as muskrats or rabbits.They have a very high metabolism, so they need to eat frequently. Meat based diets have been used in most institutions for growth, maintenance, and breeding of ASC otters. Otters recline to eat. Table 1.5 briefly describes the nutrient content of In the wild the otters eat primarily crustaceans and mollusks but will also eat fish, insects, amphibians and reptiles. Neat Facts. 5. Those gorgeous whiskers aren’t just for show, although they do look quite stylish. Predators: The river otter has few natural predators because of its strength, sharp teeth, aggressiveness when attacked, and aquatic habits. 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