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Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-27T11:26:26Z No. of bitstreams: 0Bitstream added on 2014-05-27T14:47:39Z : No. of bitstreams: 1 2-s2.0-84859208367.pdf: 746043 bytes, checksum: a1cdc1bbab6e541b4d50f6a05739f20e (MD5) Made available in DSpace on 2014-05-27T11:26:26Z (GMT). No. of bitstreams: 0 Previous issue date: 2012-04-04 The present study evaluated the microbiological water quality and tissue lesions in gills from Nile tilapia (Oreochromis niloticus) and hybrid tambacu (Colossoma macropomum female x Piaractus mesopotamicus male). For this, water and gills were collected from fish farming at six locations in Itapecuru- Mirim County, Maranhão State. Microbiological water analyses revealed contamination by total coliforms, Escherichia coli and heterotrophic bacteria. In the gills, we observed a diversity of Gram-positive and Gramnegative bacteria. The tissue lesions were: lamellar fusion, interlamellar hyperplasia, sub-epithelial edema and telangiectasia. Inflammatory lesions were not observed. Significant statistical difference (p > 0.05) was not detected when comparing different gills lesions during rainy and dry season. The correlation between lesion and pond type was statistically different (p < 0.05) for lamellar fusion and interlamellar hyperplasia which occurred more frequently at ground ponds. Regarding the frequency of lesions in the different fish species, there was statistical difference (p < 0.05), and the tambacu was more sensitive to lamellar fusion while tilapia was more sensitive for the other lesions. In relation to the sampling stations, there was statistical difference for all the gill lesions. In conclusion, tissue lesions are nonspecific and function as a defense mechanism against polluted aquatic environments, without infectious character. Departamento de Química e Biologia Universidade Estadual do Maranhão, Cidade Universitária Paulo VI, s/n, São Luís, Maranhão Departamento de Patologia Veterinária Universidade Estadual do Maranhão, São Luís, Maranhão Departamento de Patologia Veterinária Faculdade de Ciências Agrárias e Veterinárias Universidade Estadual Paulista Júlio de Mesquita Filho, Jaboticabal, São Paulo Departamento de Patologia Veterinária Faculdade de Ciências Agrárias e Veterinárias Universidade Estadual Paulista Júlio de Mesquita Filho, Jaboticabal, São Paulo

Made available in DSpace on 2022-04-28T22:37:17Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-01-01 A histological analysis was conducted on the gills of 15 Piaractus mesopotamicus and 19 Prochilodus lineatus specimens collected between April and November 2004 from the Aquidauana River, State of Mato Grosso do Sul, Central-West Brazil, to describe the anatomopathological characteristics of the gills of these freshwater fish. Gill samples were fixated in 10% buffered formalin and processed following histological routine procedures. The histological examination of the gills of P. mesopotamicus revealed intralamellar monogenean and mixosporean cysts of Henneguya piaractus at several developmental stages over the entire (basal, median and distal) lamella. Intraepithelial cysts caused lamella dilation and deformity of adjacent lamellae. In P. lineatus gills, monogenean cysts were detected. In both host species, hyperplasia of the gill epithelium and structural disorganization of secondary lamellae was seen diffusely in the gills, leading to fused lamellae in the gills. In few cases, there was found mononuclear inflammatory cells and hemorrhagic focal points distally in the lamellae. Unidade Universitária de Aquidauana Universidade Estadual de Mato Grosso do Sul - UEMS Departamento de Patologia Veterinária Centro de Aqüicultura Universidade Estadual Paulista - UNESPCristiane Meldau de Campos Departamento de Patologia Veterinária Centro de Aqüicultura Universidade Estadual Paulista - UNESPCristiane Meldau de Campos

Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-27T11:22:47Z No. of bitstreams: 0Bitstream added on 2014-05-27T14:46:08Z : No. of bitstreams: 1 2-s2.0-45549102865.pdf: 140856 bytes, checksum: 40c381104fadeaae7c8b77dc5726b278 (MD5) Made available in DSpace on 2014-05-27T11:22:47Z (GMT). No. of bitstreams: 0 Previous issue date: 2008-01-01 In this work are presented data for mean abundance, prevalence and mean intensity of infection in 34 specimens of Pseudoplatystoma fasciatum, commonly called cacharas. Fish were captured using nets in the Aquidauana river during March, September and November 2003, October 2004 and October 2005. All analyzed fish were infected. Nineteen species of parasites were collected - seven of them were proteocephalid cestodes, three monogeneans, one species of digeneans, three nematodes, one acanthocephalan, one crustacean, one pentastomid and two species of myxosporeans. The first records of Harriscolex kaparari and Megathylacus travassosi in P. fasciatum in the Aquidauana river were observed. Monogeneans featured the highest prevalence (100%), followed by cestodes (91.18%) and nematodes (58.82%). Universidade Estadual de Mato Grosso do Sul, Rod. Aquidauana, km 12, 79200-000, Aquidauana, Mato Grosso do Sul Núcleo de Pesquisas em Limnologia Ictiologia e Aqüicultura Universidade Estadual de Maringá, Maringá, Paraná Centro de Aqüicultura Universidade Estadual Paulista Júlio de Mesquita Filho, Jaboticabal, São Paulo Centro de Aqüicultura Universidade Estadual Paulista Júlio de Mesquita Filho, Jaboticabal, São Paulo

Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-27T11:20:33Z No. of bitstreams: 0Bitstream added on 2014-05-27T14:44:50Z : No. of bitstreams: 1 2-s2.0-0036938850.pdf: 158888 bytes, checksum: 7b78fe56cca49091de376d23d41268ae (MD5) Made available in DSpace on 2014-05-27T11:20:33Z (GMT). No. of bitstreams: 0 Previous issue date: 2002-12-01 This paper evaluated the haematological and glycaemic parameters in Piaractus mesopotamicus (Osteichthyes, Characidae) infected with Monogenea Anacanthorus penilabiatus Boeger, Husak & Martins, 1995 (Dactylogyridae) after treatment with 0.50 mg/L and 1.00 mg/L of copper sulphate (CuSO4). The efficacy of the CuSO4 was observed in the first day after administration but not after eight, fifteen or thirty days. The histopathological analyses showed hyperplasia of the epithelium and circulatory changes in the gills. In the first day after treatment significant changes (P