Confinement during field studies may jeopardize antioxidant and physiological responses of Nile tilapia to contaminants
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- 作者：Rafael Trevisan ; Marcela Uliano-Silva ; Jeferson Luis Franco ; Thais Posser ; Roberto Hoppe ; Marcelo Farina ; Afonso Celso Dias Bainy ; Alcir Luiz Dafre
- 关键词：Ecotoxicology ; Oreochromis niloticus ; Fish ; Biomarker ; Antioxidant ; Confinement stress
- 刊名：Marine Environmental Research
- 出版年：October, 2013
- 年：2013
- 卷：91
- 期：Complete
- 页码：97-103
- 全文大小：440 K
文摘
This work evaluates the effects of caging, a known confinement stress, in Nile tilapia (Oreochromis niloticus) during an environmental study in Cubat茫o river, southern Brazil. Caging animals for 7 days, regardless of being at the reference or at a contaminated site, resulted in lower levels of antioxidant-related defenses (glutathione, glutathione S-transferase, glucose-6-phosphate dehydrogenase) in liver and physiological parameters (blood glucose and lactate) as compared with free-swimming animals. Higher hepatic glutathione reductase activity and elevated Hb content could be associated to contaminant exposure. In conclusion, the confinement stress in caged Nile tilapia biochemical and physiological disturbances, acting as a confounding factor in field studies.