Other Free Encyclopedias » Animal Life Resource » Mollusks, Crustaceans, and Related Species

Krill: Euphausiacea - Physical Characteristics, Behavior And Reproduction, Krill And People, North Pacific Krill (euphausia Pacifica): Species Accounts - GEOGRAPHIC RANGE, HABITAT, DIET, CONSERVATION STATUS

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NORTH PACIFIC KRILL (Euphausia pacifica): SPECIES ACCOUNTS
ANTARCTIC KRILL (Euphausia superba): SPECIES ACCOUNTS

Krill are found in all oceans.

Krill swim in water off the coast, out in the open ocean, and around polar ice. Most krill feed and mate close to the surface, but a few species live at depths of up to 16,404 feet (5,000 meters).


Krill eat free-floating organisms known as plankton, which are microscopic plants and animals.


No species of krill are listed by the World Conservation Union (IUCN) as endangered or threatened. Still, over-fishing and climate change could threaten krill populations and the animals that depend on them.

Additional Topics

Krill: Euphausiacea - Physical Characteristics

Krill are shrimplike in appearance and measure 1.57 to 5.9 inches (40 to 150 millimeters) in length. Their red-spotted bodies are transparent, with their internal organs visible from the outside. They have two pairs of antennae, both of them branched, or biramous (BY-ray-mus). Their large compound eyes are set on stalks. Each compound eye has many individual lenses. The head and segmented thorax a…

Krill: Euphausiacea - Behavior And Reproduction

Krill filter their food from the water using their bristly thoracic legs like a basket. Water is squeezed through the basket, leaving the plankton behind. The food is moved toward the mouth with the other legs. Krill grow by molting, or shedding their external skeletons. They molt and grow throughout their lives. When food is scarce, their bodies actually shrink with each molt. Smaller bodies requ…

Krill: Euphausiacea - Krill And People

Krill: Euphausiacea - North Pacific Krill (euphausia Pacifica): Species Accounts

Physical characteristics: North Pacific krill measure about 0.75 inches (19 millimeters) and weigh about 0.003 ounces (0.1 grams). Geographic range: They are found in the North Pacific Ocean, from North America to Japan. Habitat: North Pacific krill live in open water at the edge of the continental shelf or just beyond. They are found at the surface to depths of about 984.24 feet (300 meters). Die…

Krill: Euphausiacea - Antarctic Krill (euphausia Superba): Species Accounts

Physical characteristics: Adult Antarctic krill measure up to 2.5 inches (65 millimeters) in length and weigh up to 0.07 ounces (2 g). Their gut is green due to their diet of free-floating, microscopic plant organisms or phytoplankton. Geographic range: They live in the oceans surrounding Antarctica. Habitat: Antarctic krill are found from the surface to depths of 1,640 feet (500 meters). Their ma…

Amphionids: Amphionidacea - Physical Characteristics, Behavior And Reproduction - GEOGRAPHIC RANGE, HABITAT, DIET, AMPHIONIDS AND PEOPLE, CONSERVATION STATUS [next] [back] Anaspidaceans: Anaspidacea - Physical Characteristics, Behavior And Reproduction, Anaspidaceans And People, No Common Name (anaspides Tasmaniae): Species Account - GEOGRAPHIC RANGE, HABITAT, DIET, CONSERVATION STATUS

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