Search

This study evaluated the effect of short‐term baths with the essential oils (EOs) of Lippia sidoides, Ocimum gratissimum and Zingiber officinale on the survival, haematological, biochemical and histopathological parameters of native fish tambaqui (Colossoma macropomum), challenged with Aeromonas hydrophila. After challenge, the fish infected with A. hydrophila received therapeutic baths of 60 min, for five consecutive days. Treatments were as follows: challenged and not treated; challenged and treated with 10 mg L−1 of gentamicin; challenged and treated with EO of L. sidoides (2.5 and 5.0 mg L−1); challenged and treated with EO of O. gratissimum (5.0 and 10.0 mg L−1); challenged and treated with Z. officinale EO (5.0 and 10.0 mg L−1). The highest survival rates were 89.5% (fish treated with 5.0 mg L−1 of O. gratissimum EO) and 75.0% (fish treated with 5.0 mg L−1 of L. sidoides EO). Reductions in the haematocrit percentage, haemoglobin and erythrocyte number were observed in fish treated with L. sidoides and Z. officinale EOs compared with control fish. Mild to moderate damage to the liver tissue of fish after challenge and EO treatments were observed. It is suggested that baths containing O. gratissimum and L. sidoides EOs consist in a viable treatment to increase survival rates of C. macropomum infected with A. hydrophila. [ABSTRACT FROM AUTHOR]

Copyright of Archives of Veterinary Science is the property of Archives of Veterinary Science and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Neoechinorhynchus buttnerae is the only acanthocephalan species that has been detected infecting tambaqui (Colossoma macropomum) in northern Brazil. This helminth greatly affects nutrient uptake in fish and leads to cachexia and economic losses of up to 100% in tambaqui production. This study investigated the efficacy, in vitro and in vivo, of a food additive (Acantex) to control N. buttnerae in tambaqui, as well as its effects on fish blood parameters and possible effect on monogeneans. For the in vitro assay, the parasites were exposed to nine concentrations (1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5 and 5.0 mg/kg) of Acantex and one control (without the product). For the in vivo assay, 120 naturally infected tambaqui were distributed into twelve tanks (10 fish per tank) and were divided into four treatments, in triplicate. Fish were fed with commercial feed containing 0.0, 3.0, 4.0 and 5.0 mg/kg of Acantex, for 25 days. Acantex at 3.0 mg/kg showed 100% efficacy against N. buttnerae in in vitro testing, after exposure for 2 hr. In vivo efficacy was 13.46% at 3.0 mg/kg against the endoparasite N. buttnerae and caused a mortality rate of 19%–37% of monogeneans. Blood and biochemical parameters suggested that fish were malnourished due to attached intestinal parasites and the resulting competition for nutrient uptake. Acantex did not show adequate efficacy in treating acanthocephalosis under the conditions of this study; therefore, more efficient forms of Acantex administration in the diet of tambaqui are warranted to eliminate acanthocephalans. [ABSTRACT FROM AUTHOR]

Copyright of Revista Brasileira de Higiene e Sanidade Animal is the property of Associacao Cientifica dos Medicos Veterinarios do Ceara and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Brasileira de Higiene e Sanidade Animal is the property of Associacao Cientifica dos Medicos Veterinarios do Ceara and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)