456 resultados para Oreochromis niloticus (L.)
Resumo:
This study describes the occurrence and the seasonality of parasites of cultivated fish from a fee fishing farm located in Guariba, São Paulo State, Brazil (21°15'22'' S, 48°18'58'' W and 595 m of altitude), from August, 2001 to July, 2002. The presence of parasites was researched in pacu Piaractus mesopotamicus (Characidae), common carp Cyprinus carpio (Cyprinidae), nile-tilapia Oreochromis niloticus (Cichlidae), tambacu hybrid (male of P. mesopotamicus x female of tambaqui-Colossoma macropomum) and piraputanga Brycon hillari (Characidae). Results demonstrate that out of 100 fish examined, 15% were sponged for at least one of the following parasites: Trichodina sp.; monogenean helminths; copepodits of Lemaea cyprinacea; adults of L. cyprinacea; or Dolops carvalhoi. In decreasing order, the susceptibility degree of the hosts was C. carpio, P. mesopotamicus, B. hillari, tambacu hybrid and O. niloticus. In decreasing order the reported parasites were monogenean helminths, Dolops carvalhoi, Trichodina sp., adults of Lernaea cyprinacea and their young shapes.
Resumo:
Chilodonelids are small ciliated protozoans found worldwide and can be dangerous in culture conditions. This study presents morphometric data on the ciliate Chilodonella that is found in cultured Nile tilapia (Oreochromis niloticus), native bait fish tuvira (Gymnotus aff. inaequilabiatus) and native pacu (Piaractus mesopotamicus) and includes a histopathological assessment of the changes that occur in the pacu. For parasitic diagnosis, skin and gill samples were scraped onto slides, dried at room temperature, stained with Giemsa or impregnated with silver nitrate, and the measurements were obtained from photomicrographs. In the diseased pacu, the first gill arch was collected and fixed in a 10% buffered formalin solution for histopathological analysis. Parasite specimens from the different collection sites were identified morphologically as C. hexasticha Kiernik (1909). Diseased fish exhibited depigmentation, skin ulceration, scale loss, excessive mucus production and gill lesions. Histopathological analysis of pacu gills displayed epithelial proliferation with mononuclear inflammatory infiltrate, hemorrhages, and scattering necrosis. In Brazilian-farmed fish this is the first record of C. hexasticha, which has great pathogenic potential in cultured freshwater species. In addition, two new hosts are presented. © 2012 Elsevier B.V.
Resumo:
Nile tilapia fish were individually reared under similar light levels for 8 weeks under five colored light spectra (maximum wavelength absorbance): white (full light spectrum), blue (~452 nm), green (~516 nm), yellow (~520 nm) or red (~628 nm). The effects of light on feeding, latency to begin feeding, growth and feed conversion were measured during the last 4 weeks of the study (i.e., after acclimation). We found that red light stimulates feeding, as in humans, most likely by affecting central control centers, but the extra feeding is not converted into growth. © 2013 Volpato et al.
Resumo:
Conselho Nacional de Desenvolvimento CientÃfico e Tecnológico (CNPq)
Resumo:
Coordenação de Aperfeiçoamento de Pessoal de NÃvel Superior (CAPES)
Resumo:
Conselho Nacional de Desenvolvimento CientÃfico e Tecnológico (CNPq)
Resumo:
Conselho Nacional de Desenvolvimento CientÃfico e Tecnológico (CNPq)
Resumo:
Pós-graduação em Aquicultura - FCAV
Resumo:
Conselho Nacional de Desenvolvimento CientÃfico e Tecnológico (CNPq)
Resumo:
Pós-graduação em Zootecnia - FMVZ
Resumo:
Conselho Nacional de Desenvolvimento CientÃfico e Tecnológico (CNPq)
Resumo:
Conselho Nacional de Desenvolvimento CientÃfico e Tecnológico (CNPq)
Resumo:
Pós-graduação em Aquicultura - FCAV
Resumo:
Coordenação de Aperfeiçoamento de Pessoal de NÃvel Superior (CAPES)
Resumo:
Pós-graduação em Ciências Biológicas (Biologia Celular e Molecular) - IBRC