Table 6 Histomorphometric results of the intestine and liver of R. rutilus juveniles fed commercial diet (Control) and the diet supplemented with: β-glucan (G), L. plantarum (L) and β-glucan+L. plantarum (G + L) (±SD)

342.23 ± 39.17^a

282.47 ± 93.87^b

313.79 ± 40.73^ab

317.54 ± 32.61^ab

27.19 ± 5.07^b

40.05 ± 11.97^a

25.93 ± 3.27^b

35.35 ± 4.33^a

8.91 ± 1.68^b

18.02 ± 2.32^a

26.67 ± 4.94^c

27.93 ± 5.06^c

0.65 ± 0.41^b

2.13 ± 0.57^c

2.64 ± 0.53^c

8.73 ± 1.07^a

292.48 ± 32.78^b

249.34 ± 51.27^b

274.69 ± 32.31^b

210.71 ± 23.95^a

14.89 ± 3.83^b

17.22 ± 3.30^b

15.49 ± 2.64^b

35.82 ± 4.72^a

4.71 ± 0.99^b

9.48 ± 2.32^c

11.14 ± 1.29^c

26.34 ± 4.19^a

1.96 ± 0.57^c

1.91 ± 0.58^c

3.38 ± 0.92^b

7.31 ± 2.05^a

290.29 ± 54.14^b

297.76 ± 53.93^b

330.11 ± 59.35^b

248.32 ± 29.04^a

44.11 ± 9.46^ab

48.94 ± 12.29^a

34.22 ± 7.70^c

39.36 ± 3.62^bc

12.78 ± 1.61^b

16.53 ± 3.59^a

11.63 ± 1.73^b

18.87 ± 4.23^a

0.006 ± 0.003^c

0.016 ± 0.004^bc

0.011 ± 0.008^b

0.031 ± 0.007^a