The transient ecotype in the eastern North Pacific hunt marine mammals including sea otters. Otters weigh 35-90 pounds (males weigh more than females). Sea otters eat about 20-30% of their body weight each day. The giant otter is a piscivore (an animal that eats primarily fish). As is the case with many species, Eurasian otters tend to live longer in captivity than in the wild. They primarily eat marine mammals including seals, sea lions, walruses, baleen whales, other toothed whales, and occasionally sea otters. Incomplete webbing between the toes gives them a great deal of manual dexterity. At the Zoo, the two giant otters receive 4 pounds of fish a day (catfish, tilapia and trout). What do otters eat? However, in captivity, they can live for up to twice as long. 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. For the most part, they eat fish, and, for that reason, we can call them carnivores. In the wild the otters eat primarily crustaceans and mollusks but will also eat fish, insects, amphibians and reptiles. Otters are accustomed to preying on live animals; hunting is an integral part of an otter’s life. Diet. During the spring months amphibians form a large part of their diet. So, a 50-pound otter would need to eat about 10-15 pounds of food per day. The otters also ranged in age between three months and 19 years old. In captivity, diets can vary somewhat but need to provide a lot of basic nutrients. River otters eat a variety of aquatic wildlife, such as fish, crayfish, crabs, frogs, birds’ eggs, birds and reptiles such as turtles. Otters in captivity are often seen juggling like this. However, some otter … 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. Diet. Asian small-clawed otters use their forepaws rather than their mouth to locate and capture food items. Otter live to around 12 years old in the wild, and longer in captivity. In captivity, that number increases slightly to the late teens. River otters eat mostly frogs, crabs, crayfish, fish and mollusks. In the wild, they mostly eat fish, while sea-dwelling otters use stones to break open mollusks. To sustain a captive population of Asian small-clawed otters, the nutritional needs of the species must be met. The two breeds have different diets, where Asian small-clawed eat shellfish and crabs while smooth-coated otters prey on fish. Sea otters have a high metabolic rate (that is, they use a high amount of energy) that is 2-3 times that of other mammals their size. Specifically they feed on mostly catfish, perch and characins but also eat small snakes, caimans and crustaceans. Despite popular belief, otters don’t feed on berries and plants. 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