Commercial shrimp species support an industry worth 50 billion dollars a year, and in 2010 the total commercial production of shrimp was nearly 7 million tonnes. The muscular tails of many shrimp are edible to humans, and they are widely caught and farmed for human consumption. They play important roles in the food chain and are an important food source for larger animals ranging from fish to whales. Shrimp are often solitary, though they can form large schools during the spawning season. They usually live from one to seven years. To escape predators, some species flip off the seafloor and dive into the sediment. They can be found feeding near the seafloor on most coasts and estuaries, as well as in rivers and lakes. There are thousands of species adapted to a wide range of habitats. Crabs and lobsters have strong walking legs, whereas shrimp have thin, fragile legs which they use primarily for perching. They swim forward by paddling with swimmerets on the underside of their abdomens, although their escape response is typically repeated flicks with the tail driving them backwards very quickly. Any small crustacean which resembles a shrimp tends to be called one. Under a broader definition, shrimp may be synonymous with prawn, covering stalk-eyed swimming crustaceans with long, narrow muscular tails ( abdomens), long whiskers ( antennae), and slender legs. More narrow definitions may be restricted to Caridea, to smaller species of either group or to only the marine species. The shrimp Palaemon serratus of the infraorder CarideaĪ shrimp ( PL: shrimp or shrimps) is a crustacean (a form of shellfish) with an elongated body and a primarily swimming mode of locomotion – typically belonging to the Caridea or Dendrobranchiata of the decapod order, although some crustaceans outside of this order are also referred to as "shrimp".
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