Krill
Krill
Krill (/krɪl/; from Norwegian krill, meaning "small fry of fish") are small, shrimp-like marine animals that are found in all the world's oceans. They belong to the order Euphausiacea and are considered a crucial part of the aquatic food chain.
Etymology
The term "krill" is derived from the Norwegian word "krill", which translates to "small fry of fish". It was first used in English in the 19th century.
Description
Krill are small, typically measuring between 1 and 2 centimeters in length, although some species can grow up to 15 centimeters. They have a translucent exoskeleton and are known for their large, black eyes. Krill are filter feeders, consuming primarily phytoplankton and to a lesser extent, zooplankton.
Distribution and Habitat
Krill are found in all the world's oceans, with the largest populations in the Southern Ocean near Antarctica. They prefer cold, nutrient-rich waters and can form dense swarms that are visible from space.
Importance in the Food Chain
Krill are a vital part of the marine food chain, serving as a primary food source for many larger marine animals, including whales, seals, penguins, and various species of fish. The decline in krill populations due to climate change and overfishing has raised concerns about the potential impacts on these dependent species.
Related Terms
- Euphausiacea: The order to which krill belong.
- Filter feeder: An animal that strains food particles from water.
- Phytoplankton: Microscopic plants that form the base of the marine food chain.
- Zooplankton: Tiny animals that feed on phytoplankton and are in turn eaten by larger animals.
External links
- Medical encyclopedia article on Krill
- Wikipedia's article - Krill
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