isolation of streptococcus spp from nile tilapia (oreochromis niloticus) and quality of water in hapas nets in north region of parana state, brazil/
isolamento de streptococcus spp de tilápias do nilo (oreochromis niloticus) e qualidade da água de tanques rede na região norte do estado do paraná, brasil

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ID: 196944
2003
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Abstract
This study evaluated 12 intensive breed of Nile tilapia (Oreochromis niloticus) in four properties localized in the north of Parana State, Brazil. In the period of 13 months, 71 fishes were collected and analyzed of hapas nets that presenting morbidity and mortality of tilapias. Parallel, to evaluate the quality of the water of these hapas nets, there was measured the temperature, dissolved oxygen, pH, alkalinity, nitrite and ammonia. Of the 71 fishes, were collected 220 biological samples. 17 (23.94%) fishes were positive for Streptococcus spp. Of the 53 biological samples from 17 fishes, in 24 (45.28%) were isolated streptococci. The main clinical signs and macroscopic lesions in the fishes with isolation of Streptococcus spp. were hepatomegaly and splenomegaly, skin lesion and base of the fins and exoftalmia with cornea opacity. The higher incidence of infections caused by streptococci happened in the months with higher temperatures, mainly in the transition period winter for spring. The values of dissolved oxygen, pH, alkalinity, nitrite and ammonia of the water were normal.

Foram estudados doze tanques-rede de quatro propriedades de criação intensiva de tilápia do Nilo (Oreochomis niloticus) da região Norte do Paraná, Brasil. No período de 13 meses foram analisados 71 peixes provenientes de tanques apresentando morbidade e mortalidade de tilápias. Paralelamente, para avaliar a qualidade da água destes tanques, foi medida a temperatura, oxigênio dissolvido, pH, alcalinidade, nitrito e amônia. Dos 71 peixes, foram coletadas 220 materiais biológicos. Em 17 (23.94%) peixes foram isolados Streptococcus spp e dos 53 materiais biológicos provenientes destes peixes, 24 (45.28%) apresentaram Streptococcus spp. Os principais sinais clínicos e lesões macroscópicas nos peixes com isolamento de Streptococcus spp foram hepatomegalia e esplenomegalia, lesão de pele e base das nadadeiras e exoftalmia com opacidade de córnea. O maior número de infecções estreptocócicas ocorreu nos meses com temperaturas mais elevadas, principalmente no período de transição inverno para primavera. Os valores de oxigênio dissolvido, pH, alcalinidade, nitrito e amônia da água estiveram dentro da normalidade.

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moreno2003semina:isolation Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Aleksey Machado Moreno, Júlio César de Freitas, Juliana Alves Dias, Luciene Garcia Pretto-Giordano, Júlio Hermann Leonhardt, Ernst Eckehardt Müller, Rogério Salvador
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Journal frontiers in neuroendocrinology
Year 2003
DOI
10.5433/1679-0359.2003v24n1p35
URL
http://www.uel.br/revistas/uel/index.php/semagrarias/article/view/2114
Keywords
Agriculture (General)

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