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Investigations on the osmoregulation of freshwater fish (Oreochromis niloticus) following exposures to metals (Cd, Cu) in differing hardness
- Source :
- Ecotoxicology and Environmental Safety. 92:79-86
- Publication Year :
- 2013
- Publisher :
- Elsevier BV, 2013.
-
Abstract
- PubMedID: 23566882 Hardness is one of the most important factors in water chemistry as it affects fish physiology and metal toxicity. The aim of this study was to investigate osmoregulatory responses in the Nile tilapia Oreochromis niloticus exposed to copper and cadmium (1.0µg/mL) in soft water (SW) (hardness 80mg CaCO3/L and conductivity 1.77mS/cm) and hard water (HW) (hardness 320mg CaCO3/L and conductivity 5.80mS/cm) for 0, 1, 7 and 14 days. Following the exposures, Na+/K+-ATPase activity, ion and Cu levels in the gill, kidney and intestine were measured. There was no fish mortality within 14 days, except Cu exposure in SW which killed all fish between 8 and 12 days. Generally, Na+/K+-ATPase activity was altered by both metal exposures in the gill and kidney as it increased in HW condition, but decreased in SW condition. There were also alterations in Na+/K+-ATPase activity in the intestine as its activity generally decreased. Data, in general, showed that Cd was more effective on Na+/K+-ATPase activity comparing to Cu. However, ion levels altered mainly in the kidney and intestine. Tissue metal accumulation was higher in fish tissues from SW condition comparing to HW condition. Data represented here showed that the effects of metals differed in differing water hardness. This suggests that special attention should be paid to the water chemistry when natural monitoring studies are carried out. This study also suggests that the response of osmoregulation system of fish may be a sensitive indicator under stressful conditions in different natural waters. © 2013 Elsevier Inc. Çukurova Üniversitesi This study supported by Research Fund ( FEF2010YL6 ) to Dilek SAGLAM from Çukurova University .
- Subjects :
- Gills
Fish mortality
Ion levels
Health, Toxicology and Mutagenesis
chemistry.chemical_element
Fresh Water
Kidney
Nile tilapia
Fish physiology
Animal science
Hardness
Animals
ATPase
Intestinal Mucosa
Ions
Cadmium
biology
Public Health, Environmental and Occupational Health
Cichlids
General Medicine
Water-Electrolyte Balance
biology.organism_classification
Pollution
Intestines
Oreochromis
chemistry
Environmental chemistry
Osmoregulation
Freshwater fish
Soft water
Water Pollutants, Chemical
Copper
Subjects
Details
- ISSN :
- 01476513
- Volume :
- 92
- Database :
- OpenAIRE
- Journal :
- Ecotoxicology and Environmental Safety
- Accession number :
- edsair.doi.dedup.....e9045dc1e97cffcef48d8239ff6ac749