The Acute Toxicity of Copper to Nile Tilapia (Oreochromis niloticus) Fingerlings and its Effects on Gill and Liver Histology
| Autor: | Rasha K Abd El-Wahed, Akram I Alkobaby |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Gill
biology Copper toxicity chemistry.chemical_element 04 agricultural and veterinary sciences 02 engineering and technology Aquatic Science 021001 nanoscience & nanotechnology biology.organism_classification medicine.disease Copper Acute toxicity Toxicology Nile tilapia Oreochromis Animal science chemistry Toxicity 040102 fisheries medicine 0401 agriculture forestry and fisheries 0210 nano-technology Pyknosis |
| Zdroj: | Journal of Aquaculture Research & Development. |
| ISSN: | 2155-9546 |
| Popis: | This study was carried out to evaluate the response of Nile tilapia, Oreochromis niloticus to acute copper toxicity. Nile tilapia fingerlings (2.97 g/f ± 0.37) were acclimated and randomly distributed at a rate of 10 fish per 60-L aquarium. In a series of static renewal-toxicity tests, fish were exposed to concentrations of 0, 5, 10, 15, 20, 25, 30, 35 and 40 mg L-1 copper sulfate (CuSO4·5H2O). Fish not exposed to any chemical served as negative controls. Histological sections were done in fish gills and liver in all treatments. Estimates of mean 96-h LC50 values (median lethal concentration) value of copper sulfate was 31.2 mg L-1 (7.94 mg copper L-1). In all exposure groups, some of the typical gill lesions are presented. The main alternations observed after the exposure to the cupper were epithelial hyperplasia, lifting of the lamellar epithelium, edema in the filamental epithelium, Curling, clubbed tips of secondary lamella and finally a complete fusion of several secondary lamellae at the 35 mg CuSO4 concentration. The severity of the lesions detected increased with the increase of copper sulfate concentration. Exposure to concentrations of copper sulfate more than 10 mg L-1 increased the arithmetic thickness of secondary lamella epithelium in O. niloticus which was significantly higher (P |
| Databáze: | OpenAIRE |
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