An experience was taken to the laboratory of Limnology of the CRSN/Lwiro in view to verify if fishes Barbus pellegrini would get acclimatized well in captivity and would consume larvas of mosquitos because well-known of entomophages, it of the 23/04 at 12/05/2014. To the term of this one, we noted a good acclimatization of our fishes in their surroundings of raising; larvas of mosquitos submitted to our fishes were consumed since the 6 hours of their submissiveness. When to what was to know how much of larvas a fish could consume, a variation in active number of 4 to 10 larvas in 24h was him. It has is sufficient 9 to 14 days so that develop himself of mosquito larvas in adults.