Histological alterations in gills of Nile tilapia Oreochromis niloticus caused by cadmium

被引:39
|
作者
Garcia-Santos, S. [1 ]
Monteiro, S. M. [1 ]
Carrola, J. [1 ]
Fontainhas-Fernandes, A. [1 ]
机构
[1] Univ Tras Montes Alto Dourno, Ctr Estudos Tecnol Ambiente Vida, P-5000911 Vila Real, Portugal
关键词
tilapia; Oreochromis niloticus; cadmium; histopathology; gills;
D O I
10.1590/S0102-09352007000200017
中图分类号
S85 [动物医学(兽医学)];
学科分类号
0906 ;
摘要
The histopathogical effects of cadmium on the gills of tilapia Oreochromis niloticus were studied by light microscopy, using 25mgl(-1) of CdCl2 during four days to identified the effects of short-term exposure on gills structure. The general morphology of O. niloticus gills is similar to the other teleostean fishes, showing four pairs of gills arches with well developed filaments. Bilaterally situated, secondary lamellae branches are found from the central axis of the filaments. The filamentar epithelium showed the chloride cells, the pavement cells and mucous cells. Fish exposed to cadmium showed signs of epithelial lesion, namely the interstitial edema, swollen of the lamellae, lifting and cellular proliferation of the filamentar epithelium. The changes of the gills also included lamellar fusion as a result of epithelial hyperplasia and hypertrophy, the breakdown of pillar cell system, and aneurisms with some ruptures and necrosis, especially in the filamentar epithelium.
引用
收藏
页码:376 / 381
页数:6
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