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| Titel: |
Environmental stress in lake maryut and physiological response of Tilapia zilli Gerv,. |
| Auteur: |
Adham, K. Khairalla, A. Abu-Shabana, M. Abdel-Maguid, N. Moneim, A. Abdel |
| Verschenen in: |
Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering |
| Paginering: | Jaargang 32 (1997) nr. 9-10 pagina's 2585-2598 |
| Jaar: |
1997-10 |
| Inhoud: |
This study was initiated to evaluate the effect of hazardous exposure to water pollutants on Tilapia zilli Gerv, inhabiting Lake Maryut, at 3 different sites with varying degrees of physicochemical and organic criteria. As compared to other sites, the lower water turbidity and alkalinity plus lesser metal content in site #1, signify its picking as reference.The expected anoxicity of the polluted sites (#2& #3) was evidenced by the elevated chemical-and biological-oxygen demands added to reduced dissolved oxygen. Abundant phytoplankton and sewage effluents coupled with the high productivity of the lake have elevated water pH and nutrient salts; thus causing a chronic eutrophication problem. Emerging evidence suggests that T. zilli, responded differently according to the environmental stress index in each catch area. In polluted fish, serum hyper-αl-, α2-, and β-globulinemia plus low albumin added to the enhanced activities of serum transaminases and lactate dehydrogenase suggests chronic functional damage in the liver. However, the hyper-y-globulinemia implies an indirect challenge response toward the invasion of endo-and ectoparasites. Serum enzymes, protein, lipid, cholesterol, creatinine, and glucose fluctuated in a positive correlation contra the guidelines of water pollutants; they are thus validated as beneficial "biochemical markers”;, for contamination stress. Unlike other biological principles investigated, alkaline phosphatase proved to be a promising "model”;, for appraising moderate, sublethal, or metal- restricted contamination,. Other water pollutants, as petroleum oil, seem to interfere with this peculiarity. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 11 van 23 gevonden artikelen
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