Environmental quality of an estuary in Amazon delta using immunohistochemical and morphological analyses of gill as biomarkers
In this study, histological, ultrastructural, and immunohistochemical observations of the gill tissue of two fish species (Plagioscion squamosissimus and Lithodoras dorsalis) were used as biomarkers to assess the ecological conditions of an estuary in the Amazon delta, by relating the health status...
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Published in | Acta scientiarum. Biological sciences Vol. 37; no. 1; pp. 113 - 121 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Maringa
Editora da Universidade Estadual de Maringá - EDUEM
2015
Universidade Estadual de Maringá |
Subjects | |
Online Access | Get full text |
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Summary: | In this study, histological, ultrastructural, and immunohistochemical observations of the gill tissue of two fish species (Plagioscion squamosissimus and Lithodoras dorsalis) were used as biomarkers to assess the ecological conditions of an estuary in the Amazon delta, by relating the health status of the fishes to environmental quality. The gill tissue was analyzed both qualitatively and semi-quantitatively. Marked differences in the type and severity of lesions were verified between species and among study sites. A variety of severe damages were confirmed histologically in specimens from the two impacted areas (B and C), including aneurysms, epithelial lifting, and intense hyperplasia. Electron microscopy and immunohistochemical analyses also revealed injuries in the gill tissue of specimens from these two areas. While, on area A only few specimens showed mild changes in gill tissues and rare marking of apoptosis. These results confirm the urgent need for the more effective control of the discharge of pollutants into the estuary as well as more effective urban planning, given the close proximity of a major industrial complex to residential areas. |
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ISSN: | 1679-9283 1807-863X |
DOI: | 10.4025/actascibiolsci.v37i1.24541 |