Males are larger in size than females (see phot 2010). Outside of fish, river otters will also eat crustaceans, insects, birds, oysters, shellfish, turtles and a number of other aquatic life. River otters and giant otters hunt by using their vibrissae to detect movements of prey in the water. They will spend several hours nightly foraging in water. They hunt singly or in pairs and although otters generally forage in water, they are equally at home on land, sometimes traveling between 10 and 18 miles (16 and 29 kilometers) in search of food. Fish is a favored food among the otters, but they also consume various amphibians (such as salamanders and frogs), freshwater clams, mussels, snails, small turtles and crayfish. River otters can be considered opportunistic aquatic piscivorous carnivores, although they consume other animal products other animal material including: crustaceans, crayfish, freshwater mussles, amphibians, birds, mammals and a variety of fish species (Sucker fish, Carp, Minnows, Pike, Sunfish, Catfish, Perches, Bass), based on the work by Stearn & Serfass (2010). Based on BMR in the study by Davies et al (1992), the BMR for otters is approximately 140kcal/kg body weight/ day, and in the study there was an average of 177 kcal/ kg body weight/ day. They sometimes eat aquatic plants. The species of fish will vary depending on the location and habitat. Did you just call me a sea otter? River otters, members of the weasel family, hunt at night and feed on whatever might be available. Will 5G Impact Our Cell Phone Plans (or Our Health?! They will feed on fish, invertebrates, frogs, clams, crayfish, and small mammals or birds. Outside of fish, river otters will also eat crustaceans, insects, birds, oysters, shellfish, turtles and a number of other aquatic life. They eat plenty of fish and other water critters, such as crayfish, so you’ll spot bones, scales, and shells. Being carnivorous, otters feast on a variety of meats from the fish they catch, to crustaceans, mollusks, sea urchins, and amphibians. While otters are mostly carnivores, they will eat the corn that is used to fish for trout, especially along rivers that are stocked with hatchery fish. River otters consumed approximately 2-5 meals per day in study done by Davies et. These mammals have whiskers, which they use to spot their prey by detecting vibrations in the water. River otters eat a variety of aquatic wildlife, such as fish, crayfish, crabs, frogs, birds’ eggs, birds and reptiles such as turtles. River otters typically maintain a consistent body weight throughout the year, due to their opportunistic nature and ability to survive in a variety of environments and temperatures (Henry et al 2012). In the same study they established the mean quality of food consumed was approximately 853g/day, or consumed about 9% of their body weight each day and otter pups consume about 15% of their body weight. The giant river otters are excellent predators. There are deep-diving otters that eat benthic organisms such as urchins, crabs, and abalone, medium-diving otters that forage for clams and worms and others that feed at the surface on organisms such as snails. River otters can dive to a depth of 60 feet. River Otters It is not uncommon for anglers to have to fight river otters for their bait. ), The Secret Science of Solving Crossword Puzzles, Racist Phrases to Remove From Your Mental Lexicon. Before much of Arkansas’s mussel population was depleted during the pearl rush, they were also a favorite meal. River Otters are opportunistic carnivores and will eat a variety of prey species found in their environment. As aquatic animals, otters have webbed feet, which is somewhat visible in their tracks. When they are hungry for larger game, otters will attack birds, young beavers, and muskrats. Otters always wash themselves after every meal. initially go for the slowest fish first, example sucker fish, exerting the least amount of energy, hunt in areas that have narrow rivers/ streams where there is a higher density of fish populations (Kruuk 2006) and North America has rich diversity of fish, probably reason there is such a large distribution of river otters, when hunting (see video), can usually see the head skimming the surface along with occasional diving, remaining closer to the surface, a mean underwater time of approximately 21 seconds (Kruuk 2006), represents a fairly significant energy investment, Also can consume birds and coots by approaching the prey from underneath the water, and occasionally hunting in pairs and use their adapted sight and touch to find prey (Wilson 1954), Can eat prey in the water being classifies as "single prey loaders" meaning they must bring the food item to the surface to consume it (Reed-Smith 2012), but primarily bring their prey to the shore, especially for larger prey, again to conserve energy, Sometimes a single otter feeds on a single prey and sometimes several feed, depending on the size of the prey (Stearns and Serfass 2010), River otters are generally crepuscular or nocturnal and during the winter seasons more diurnal, usually coinciding with an avoidance of human interaction (Reed-Smith 2012). With the ability to smell concentrations of fish and their high metabolisms, otters spend most of their time hunting for their next meal. al (1992). The main macromolecule suggestion for river otters based on a study by White et al 2007: protein: 42.9–68.1%, fat: 18.4–37.9%, Carbohydrates: N/A. Once you locate otters, take note of behaviour, weather and river conditions, numbers, and other general details of what you saw, along with times and dates. Availability and vulnerability of their prey are the main determining factors in the seasonal variation of the river otters diet (Stearns and Serfass 2010). The 11 species often referred to as river otters are found throughout North America, South America, Europe, Africa, and Asia in freshwater ecosystems that sustain an abundance of prey such as fish, crayfish, crabs, mussels, and frogs.Most river otters are opportunistic, feeding on whatever is most easily obtained. River otters' main source of food is fish, but otters are opportunists by nature and will eat a wide variety of foods. River otters eat mostly aquatic organisms, including fish, frogs, crayfish, turtles, insects and some small mammals. River otters are apex predators in their food web. Giant river otters: One of the Amazon forest's top predators 04 November 2016 (5425 visits). River otters will often renovate abandoned borrows originally constructed by beaver, muskrat, or other animals. Otters living in captivity largely prefer to consume bigger fish with the size of 15 – 17 cm (5.9 – 6.7 inches). Since the males are slightly larger than the females, they also consume more calories than the average female and more frequently. They nest on land, tending to build underground tunnels to move between the two. Some otters, such as the River Otter, are mostly solitary. The river otter food chain also consists of mussels, bivalves, snails, cr… Across the world, there are thirteen known species of otter. With the ability to smell concentrations of fish and their high metabolisms, otters spend most of their time hunting for their next meal. the … River otters can hold their breath for up to 8 minutes while under water. They use their long whiskers when swimming underwater to feel for the movement of their prey. The river otter food web plays a crucial role in the environments the river otter calls home. Fish are a favorite food, but they also eat amphibians, turtles, and crayfish. The most common fish consumed are perch, suckers, and catfish. They need to eat 15% of their body weight a day. They grow to one meter (3 to 4 ft) in length and weigh from five to 15 kilograms (10 to 30 lb). River otter’s diet also embraces redhorses, cubs, bullheads, catfish, darters, perches, sculpins, pike, salmon, trout, and pike. 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