期刊
AQUACULTURE RESEARCH
卷 45, 期 1, 页码 31-44出版社
WILEY
DOI: 10.1111/j.1365-2109.2012.03202.x
关键词
Dicentrarchus labrax; carvacrol; phytotherapy; immune response; Listonella anguillarum; disease resistance
类别
资金
- Italian Government 'Azione concertata per l'identificazione di contributi scientifici per lo sviluppo dell'acquacoltura biologica in Italia' of Ministero delle Politiche Agricole e Forestali
The research was aimed to assess the effect of dietary carvacrol (0.025% and 0.05%) on sea bass (Dicentrarchus labrax) growth, immune response and resistance to Listonella anguillarum. Fish (69.2 +/- 0.22g) were fed the experimental diets for 9weeks. Dietary carvacrol did not negatively affect fish survival, growth performance, feed intake and feed conversion ratio (P>0.05) nor carcass yield and viscerosomatic, hepatosomatic and mesenteric fat index (P>0.05). Serum and head kidney leucocytes were collected after 1, 4 and 8weeks of feeding. Carvacrol significantly reduced serum proteins, immunoglobulins and lysozyme activity (P<0.01) and moderately increased phagocytosis and pinocytosis of head kidney macrophages. The release of reactive oxygen species by leucocytes was reduced in carvacrol-fed fish, even if significantly (P<0.05) only in those fed 0.05% carvacrol for 1week. Dietary carvacrol did not significantly affect the aspecific immune response, although a potential antioxidant activity might be speculated. Moreover, feeding carvacrol provided an appreciable resistance to a challenge with L. anguillarum, when a bacterial dose lower than the Lethal Dose(50) was used. Cumulative mortality in fish fed 0.025% carvacrol was significantly lower than that of untreated controls (75% Relative Per cent Survival).
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