Eficácia do levamisol como imunoestimulante, redutor de estresse e antiparasitário no pacu

• Autor(a) principal: Pahor Filho, Eduardo [UNESP]
• Data de Publicação: 2015
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/132830; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/10-12-2015/000855035.pdf
• topic: Peixe; Pacu (Peixe); Imunidade celular; Stress (Fisiologia); Parasito; Fishes

The present study analyzed the levamisole hydrochloride (CL) action in the stress and innate immunity pacu (Piaractus mesopotamicus). Fish (180 ± 0.27 g; 16 ± 0.4 cm) were fed a diet containing CL for fifteen days. A control group and four treatments (T) were tested: T1 (100), T2 (150), T3 (300) and T4 (500) mg kg-1 CL, 15 fish/repeat, in quadruplicate. After that, fish (n = 40) were submitted to air exposure for three minutes, inoculated with the bacteria Aeromonas hydrophila and sampled one, 3, 6 and 24 h after inoculation. Were determined stress indicators (plasma cortisol, glucose and red blood cell count) and immunological indicators (leukocytes respiratory activity, complement system - ACH50 - and serum lysozyme). CL significantly reduced the plasma concentration of cortisol in one (500 mg kg-1) and 3 h (300 mg kg-1) after bacterial inoculation, compared with control fish. CL did not influence blood glucose, the number of erythrocytes and the serum concentration of lysozyme. CL (100 mg kg-1) increased the ARL in 1h and also the ACH50 in 3 h and all treatments 24 h after inoculation. The results of this study indicate that air exposure and bacterial infection were stressful for pacu, causing increased blood glucose and prejudice of lysozyme immune response and the CL was efficient to reduce cortisol and increased the phagocytic activity of macrophages and ACH50 in fish. During the initial sampling to analyze the effectiveness of levamisole hydrochloride as antiparasitic, four fish from control group and each treatment (n = 20) were euthanized by medullary section and sent for parasitological analysis. To analyze the histological lesions ten fish from control group and each treatment (n = 50) were euthanized in benzocaine (100 mg L-1). The liver was fixed in Bouin for identification and quantification of the lesions. In gills, was identified Anacanthorus penilabiatus (Monogenoidea, Dactylogyridae) and in intestines Rondonia ...