The River Shrimp, Cryphiops Caementarius, is a crustacean that lives between parallels 10° S and 30°S in rivers and ocean estuaries of the Western Slope of the Andes. As they grow, they migrate upstream, mate, and females whose eggs are fertilized move downstream to the river estuary and the Pacific Ocean. Several intakes have been built by the Ministry of Agriculture along the Cañete River. This species population has been observed to decline in several coastal rivers of Peru. This investigation was aimed to investigate whether intakes have a deleterious effect on the shrimp population, taking into account that other factors may also have an important effect. Extreme environmental conditions in which shrimp may survive have also been documented in laboratory experiments. The main objective of these research programs was to study the feasibility of the reproduction of the Cryphiops Caementarius in captivity with economic purposes. Data gathered by consulting firms show that in actuality the water physical and chemical parameters may not pose a significant threat to the reproduction of the shrimp. Field observations made during the course of this investigation, reports written by a local's fishermen association and field interviews have shown evidence that intake structures have a harmful effect on the shrimp population. It has been concluded that river intakes cause a barrier effect that prevents the smaller individuals from moving upstream. Preliminary remedial solutions have been proposed in this paper based on field observations, © 2010 ASCE.