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This study evaluated the dietary supplementation with essential oil of Lippia alba on the hemato-immunological parameters of Nile tilapia (Oreochromis niloticus) submitted to acute inflammation induced by carrageenin injection in the swim bladder. For a period of 45 days, 96 fish were divided into four treatments in triplicate, as follows: (a) fish fed supplemented diet with essential oil of L. alba (4 mL kg-1 dry ration) injected with carrageenin; (b) fish fed supplemented diet with cereal alcohol injected with carrageenin; (c) fish fed unsupplemented diet with essential oil injected with carrageenin; (d) fish fed unsupplemented diet and noninjected. Cortisol levels, erythrogram, leukogram and the inflammatory infiltrate were analyzed 6 hours after an inflammatory stimulus. Carrageenin-injected fish showed an acute inflammatory reaction in the swim bladder characterized by higher infiltrate of neutrophils and monocytes. The circulating neutrophils number was significantly higher in fish fed L. alba when compared to other treatments. No difference in cortisol levels was found. For the dose, time and administration form tested, supplementation with essential oil of L. alba did not present anti-inflammatory activity. On the other hand, an influence of dietary supplementation was observed on the neutrophils number after induced aerocystitis highlighting its immunomodulatory characteristic.

Induced aerocystitis and hemato-immunological parameters in Nile tilapia fed supplemented diet with essential oil of <i>Lippia alba</i>