Krill are eaten by whales, penguins, seals, squid, fish and people. Although krill are also eaten by hundreds of other animals, these are their greatest predators. Whales eat the larges amount of krill; the blue whale can eat up to four tons of krill each day. The diet of Adelie penguins mainly consists of krill, although all 17 species of penguin depend on krill to survive.Know More
Smaller species of seals depend on krill to survive, while larger seals, such as the leopard seal, mainly eat other animals, such as penguins and younger seals. The majority of krill are caught in the Arctic, but their numbers have decreased by at least 80 percent since the 1970s. Because of this, krill fishing is now monitored to protect the dwindling population.
The decline in krill is caused by disturbances in their ecosystem, such as global warming and climate change. Increasing Arctic temperatures due to global warming have caused less sea ice to form, resulting in less food for the krill because they eat the algae that grows beneath the sea ice. Another cause of the decline in the krill population was caused by a diatom concentration drop in the Bering Sea that occurred in 1998 during a coccolithophore bloom. Coccolithophores are also part of the krill's diet, and the concentration drop caused them to grow smaller. Kill are unable to feed on the smaller coccolithophore, resulting in less available food for the krill.Learn more about Marine Life
Sea urchins are eaten by birds, sea stars, cod, lobsters and foxes. Purple sea urchins are also eaten by otters in the northwest. Sea urchin eggs, also called roe, are eaten as a delicacy by people in Asia.Full Answer >
The killer whale is a top-level predator and has no natural enemies. However, diseased or injured killer whales may fall prey to other top-level predators of the sea.Full Answer >
A krill is a tiny crustacean that serves as a food source for many animals in marine ecosystems all over the world. Most krill are under 2 inches long and look similar to shrimp.Full Answer >
Krill eat phytoplankton and tiny single-celled plants and algae. Most species of krill are omnivorous filter feeders, although there are some carnivorous species that eat the larvae of fish and zooplankton. Most krill use their frontal appendages to form fine combs, which allow them to filter food from the water.Full Answer >