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Hematological and gill histopathological parameters of three tropical fish species from a polluted lagoon on the west coast of Mauritius.
- Source :
-
Ecotoxicology and environmental safety [Ecotoxicol Environ Saf] 2007 Nov; Vol. 68 (3), pp. 361-71. Date of Electronic Publication: 2006 Aug 01. - Publication Year :
- 2007
-
Abstract
- Gill histopathology and hematological primary indices, including blood delta-aminolevulinic acid dehydratase (deltaALA-D) activity and nucleocytoplasmic ratio of erythrocytes, were assessed in three tropical marine fish species, Scarus ghobban, Epinephelus merra, and Siganus sutor, from the presumably contaminated lagoon of Bain des Dames, Mauritius. Concurrently, the nonpolluted region of Blue Bay/Pt d'Esny was used as a reference site for comparison of fish physiological responses and seawater quality. Bain des Dames showed high seawater mercury content (6.4+/-0.5 microg/L), traces of iron (70+/-40 microg/L), and fluctuating biochemical oxygen demand values (0.488+/-0.171 mg/L day(-1)). Gill histopathological analysis revealed lesions such as epithelial hyperplasia and inflammation. Similarly, a generalized increase in blood deltaALA-D activity (131.27-355.76 nmol PBG/ml RBC.h) was recorded. Fish from Bain des Dames showed species-specific hematological responses including normocytic macrocytic blood cells (S. ghobban), macrocytic anemia (S. sutor), and active erythropoiesis (E. merra). Though the species displayed impaired health, attributed to changes in water quality, the blood responses seemingly indicate adaptation to hypoxic conditions arising from both gill degradation and perhaps oxygen-level fluctuations.
- Subjects :
- Adaptation, Physiological
Anemia, Macrocytic blood
Anemia, Macrocytic chemically induced
Animals
Environmental Monitoring methods
Erythrocyte Indices
Erythrocytes enzymology
Erythropoiesis drug effects
Fishes growth & development
Gills pathology
Iron analysis
Mauritius
Mercury analysis
Oxygen analysis
Seawater chemistry
Species Specificity
Tropical Climate
Water Pollutants, Chemical analysis
Erythrocytes drug effects
Fish Proteins blood
Fishes blood
Gills drug effects
Porphobilinogen Synthase blood
Water Pollutants, Chemical toxicity
Subjects
Details
- Language :
- English
- ISSN :
- 0147-6513
- Volume :
- 68
- Issue :
- 3
- Database :
- MEDLINE
- Journal :
- Ecotoxicology and environmental safety
- Publication Type :
- Academic Journal
- Accession number :
- 16879869
- Full Text :
- https://doi.org/10.1016/j.ecoenv.2006.06.003