Shannon’s  index (H’) Simpsom index Range of bands Range-weighted richness (Rr)

Diet I

2 weeks 2.07 ± 0.05 2.07 ± 0.05 20-25 40.50 ± 15.45     
4 weeks 1.88 ± 0.02 0.15 ± 0.05 15-18

38.44 ± 5.12

Diet II

2 weeks 2.23 ± 0.04 0.11 ± 0.04 10-15

35.21 ± 3.45

4 weeks 0.86 ± 0.1 0.61 ± 0.03 4-6

13.43 ± 2.30

Table 2: Values of Shannon and Simpsom index, range of DGGE bands and range-weighted richness obtained from specimens of gilthead seabream fed the diet I, a commercial diet; and diet II, commercial diet supplemented with the symbiotic mixture.