Fig. 2.

Effects of dietary lysine (g/kg) on the skin hemorrhage and lesion morbidity of grown-up grass carp (Ctenopharyngodon idella) after infection of Aeromonas hydrophila. (A) Low or excess levels of dietary lysine led to obvious skin haemorrhage and lesions, compared to optimal dietary lysine level in on-growing grass carp (Ctenopharyngodon idella). (B) The skin haemorrhage and lesion morbidity in grown-up grass carp (Ctenopharyngodon idella). Data represent means of 24 fish in each group, error bars indicate S.D. All values are presented as the means ± SD, (n = 3 replicates, and each replicate with 8 fish). Values marked with different letters (a to e) are significantly different (P < 0.05).