Ichthyological terms, not general ones.
Vernacular term for any small, shrimp-like, marine crustacean of the order Euphausiacea. Represent an important, sometimes principal, proportion of the diet of many marine fishes and mammals. Available as food for ornamental fishes, usually in frozen form.
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Any member of the predominantly aquatic arthropod grouping Crustacea which currently contains almost 70,000 recognised species, including all crabs, lobsters, crayfish, shrimp, krill and barnacles. It's difficult to define their characteristics since the group is of arguable hierarchical status, generally regarded to represent either a Phylum or Subphylum.
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