Several studies have monitored the immunological
parameters after intraperitoneal injection or orally administered
plant extracts on distinct fish species and they found that treated
fish showed increased lysozyme activity, phagocytic activity, complement
activity, increased respiratory burst activity and increased plasma
protein (globulin and albumin) (e.g. Dügenci et al., 2003; Wu et al.,
2010; Yuan et al., 2007) (Table 1).