Growth, resistance to vibriosis, and tolerance to stressors of the selected giant freshwater prawn, Macrobrachium rosenbergii seeds

The faster growth and higher survival of a strain, including the giant freshwater prawn (GFP), is an urgent requirement to support GFP farming. The selective breeding of GIMacro II (the superior strain of GFP) resulted in a fourth-generation (G4) which grew faster (35%) than the based population (G0). The comparative test among the selected GI Macro II (SGM), the control of GI Macro II (SGM), and the Siratu (SR, the previous superior strain) were conducted to evaluate the performance of these strains in the larval rearing phage, resistance to vibriosis of the larvae, and tolerance to stressors (pH, temperature, salinity, and formaldehyde) of the juvenile. In the larvae rearing stage, the growth (Larvae stage index, LSI) of the three populations was not different, there were 10.25 ± 0.14, 10.31 ± 0.18, and 10.12 ± 0.15 for SGM, CGM, and SR, respectively. The survival rate of the SGM is about 59.92 ± 4.631 %, significantly higher than the CGM larvae (52.67 ± 2.64 %) and SR larvae (45.85 ± 1.74 %). The resistance level of SGM larvae to Vibrio sp. infection (72.75 ± 4.88 %) is not different from the CGM larvae (70.25 ± 5.06%) and SR larvae (67.88 ± 6.59%). The tolerance level of the SGM, CGM, and SR juvenile to low pH, formaldehyde, temperature fluctuation, and salinity fluctuation were relatively high (>90%). The data suggested that the selected GI Macro II has a good prospect to be developed in the GFP farming system.