Impact of sodium lactate as a growth promoter on the hepatopancreas of the freshwater prawn Macrobrachium rosenbergii (de Man, 1879)

In the present study, histological changes of hepatopancreas were studied in response of using sodium lactate as a growth promoter to the freshwater prawn Macrobrachium rosenbergii. The prawns were fed on diet with five concentrations of sodium lactate (1, 1.5, 2, 3 and 4g/kg of diet) as food supplement for 103 days. Results showed that R and B-cells were very sensitive to different diets. Slight changes were apparent in the hepatopancreas in the 1% concentration. While, at 1.5 % concentrations, swollen of the cells and enlarged of the vacuoles were observed. Regarding the concentrations of 2%, more accumulation of vacuoles was exhibited. Increase of vacuoles in the R-cells, abnormalities of B-cells, atrophy of the F-cells and pyknosis in the hepatopancreatic cells at 3 4% were observed. This investigation and other results of the detailed study of the same authors concluded that the best using concentration of sodium lactate is 1%, because it has mild histological effects and at the same times, it has the best promotion for the growth rate of M. rosenbergii.