Azevedo J S, Fernandez W S, Farias L A, Fávaro D T I, Braga E S
Instituto Oceanográfico da Universidade de São Paulo, Praça do Oceanográfico, 191, São Paulo, Brazil.
Ecotoxicology. 2009 Jul;18(5):577-86. doi: 10.1007/s10646-009-0315-4. Epub 2009 Apr 30.
In the present study Cathorops spixii, was evaluated as a bioindicator fish for trace metal pollution. Concentrations of cobalt (Co), iron (Fe), selenium (Se) and zinc (Zn) were determined by Instrumental Neutron Activation Analysis in liver. Mercury (Hg) and methyl-mercury (MeHg) were analyzed by Cold Vapor Atomic Absorption Spectrometry in muscles and livers. High concentrations of Co, Fe, Se and Zn were observed in C. spixii from Santos Bay in comparison to fish collected in a non-polluted site in the same Brazilian coast. These trace metal concentrations were out of the permissible levels for human consumption. Although, Hg and MeHg levels were low, the C. spixii could still be used as an effective bioindicator to observe trace metal behaviors in the environment in function of the bioaccumulation process observed mainly by other analyzed trace metals. Thus, the use of this species is strongly recommended to monitor the effects and behavior of trace metal pollution in aquatic ecosystems in Brazil due to its bioaccumulation function.
在本研究中，斯氏下口鲶被评估为一种用于监测痕量金属污染的生物指示鱼。采用仪器中子活化分析法测定了肝脏中钴（Co）、铁（Fe）、硒（Se）和锌（Zn）的浓度。通过冷蒸气原子吸收光谱法分析了肌肉和肝脏中的汞（Hg）和甲基汞（MeHg）。与在巴西同一海岸未受污染地点采集的鱼类相比，在桑托斯湾采集的斯氏下口鲶体内观察到高浓度的Co、Fe、Se和Zn。这些痕量金属浓度超出了人类食用的许可水平。尽管Hg和MeHg水平较低，但斯氏下口鲶仍可作为一种有效的生物指示物，根据主要通过其他分析痕量金属观察到的生物累积过程，来观察环境中痕量金属的行为。因此，由于其生物累积功能，强烈建议使用该物种来监测巴西水生生态系统中痕量金属污染的影响和行为。
