Macrobrachium carcinus is a species of freshwater shrimp native to the Americas. It is the largest known species of Neotropical freshwater prawn, growing up to 30 centimetres (12 in) long and weighing as much as 850 grams (30 oz),  although even larger specimens have been reported. It is an important species for commercial fishing in the Sao Francisco area, where it is known by the local name of pitu. M. carcinus is omnivorous, with a diet consisting of molluscs, small fish, algae, leaf litter and insects.
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- Joachim Carolsfeld (1 November 2003). Migratory Fishes of South America: Biology, Fisheries and Conservation Status. IDRC. p. 218. ISBN 978-0-9683958-2-0. Retrieved 1 June 2012.
- Douglas P. Reagan (1 September 1996). The Food Web of a Tropical Rain Forest. University of Chicago Press. p. 452. ISBN 978-0-226-70599-6. Retrieved 1 June 2012.
- Jerry G. Walls (1 April 2009). Crawfishes of Louisiana. LSU Press. p. 220. ISBN 978-0-8071-3409-2. Retrieved 1 June 2012.
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