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| Oliveira,Sarah Ragonha de; Souza,Rondon Tatsuta Yamane Baptista de; Brasil,Elenice Martins; Andrade,Jaqueline Inês Alves de; Nunes,Érica da Silva Santiago; Ono,Eduardo Akifumi; Affonso,Elizabeth Gusmão. |
| In order to determine the lethal dose (96-h LD50) of the bacteria Aeromonas hydrophila to matrinxã, Brycon amazonicus, to be applied in challenge tests, 90 fish (63.23 ± 6.39 g) were divided into five treatments, with different bacterial solutions: T1 - Control (0.9% NaCl saline solution); T2 (4 x 10(11) cells/ mL); T3 (5 x 10(11) cells/ mL); T4 (1.36 x 10(12) cells/ mL) and T5 (3.06 x 10(12) cells/ mL). Fish were previously anesthetized with benzocaine (60 mg L-1), inoculated in the peritoneal cavity with the bacterial suspensions and then distributed into fifteen 80-L test chambers, where the water variables were monitored and fish mortality was observed. The experiment was randomly designed in three replicates and the 96-h LD50 was estimated according... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aeromonas hydrophila; 96-h LD50; Matrinxã; Tropical fishes. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672011000200019 |
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| Oliveira,Sarah Ragonha de; Souza,Rondon Tatsuta Yamane Baptista de; Nunes,Érica da Silva Santiago; Carvalho,Cristiane Suely Melo de; Menezes,Glauber Cruz de; Marcon,Jaydione Luíz; Roubach,Rodrigo; Ono,Eduardo Akifumi; Affonso,Elizabeth Gusmão. |
| Poor water quality condition has been pointed out as one of the major causes for the high mortality of ornamental fishes exported from the state of Amazonas, Brazil. The purpose of the current study was to define water quality standards for cardinal tetra (Paracheirodon axelrodi), by establishing the lower and higher for lethal temperature (LT50), lethal concentration (LC50) for total ammonia and nitrite and LC50 for acid and alkaline pH. According to the findings, cardinal tetra is rather tolerant to high temperature (33.3 ºC), to a wide pH range (acid pH=2.9 and alkaline pH=8.8) and to high total ammonia concentration (23.7 mg/L). However, temperatures below 19.6 ºC and nitrite concentrations above 1.1 mg/L NO2- may compromise fish survival especially... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 96-h LC50; Ornamental fish; Paracheirodon axelrodi; Water quality. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672008000400023 |
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