Abstract
This study evaluated the hematological response of Pimelodus maculates captured in two environments with different levels of pollution in the Itajaí-Açu river, Santa Catarina State, southern Brazil. One of them, hereby named reference site, is a water captation site that supplies the city of Blumenau, in which the riparian forest is preserved and there is no sewage discharge. The other, denominated polluted site, is characterized by discharge of domestic sewage. After water quality analysis, fish were captured, transported to the laboratory and anesthetized for the hematological exam. In the polluted site, the most probable number of fecal coliforms and water transparency were respectively higher and lower than that observed at the reference site. The main results were an increased percentage of hematocrit and reduced numbers of lymphocytes and monocytes in the differential counting in fish from the polluted site. Red blood cells, total white blood cells and total counting of thrombocytes did not vary between environments. The number of neutrophils remained at high levels in fish from both environments. This study demonstrated that water quality might affect the hematological parameters in free-living fish.
Highlights
The teleost fish Pimelodus maculatus Lacépède 1803, commonly known as yellow mandi, is a widespread species in South American rivers. It is an important commercial fish with great acceptance by consumers (LUZ; ZANIBONI-FILHO, 2002). It has been frequently found in the Itajaí-Açu river, Acta Scientiarum Biological Sciences located in Blumenau, Santa Catarina State, Brazil
From the fact that nothing is known on the hematology of fish from Itajaí-Açu river in southern Brazil, this study evaluated blood parameters in P. maculatus, an important fish for local population, captured at two sites
In the period from August to September 2006, 34 specimens of P. maculatus were captured with line and hook at two sites with different organic pollution levels in the Itajaí-Açu river, Blumenau, Santa Catarina State, Brazil
Summary
The teleost fish Pimelodus maculatus Lacépède 1803, commonly known as yellow mandi, is a widespread species in South American rivers. From the fact that nothing is known on the hematology of fish from Itajaí-Açu river in southern Brazil, this study evaluated blood parameters in P. maculatus, an important fish for local population, captured at two sites. In the period from August to September 2006, 34 specimens of P. maculatus were captured with line and hook at two sites with different organic pollution levels in the Itajaí-Açu river, Blumenau, Santa Catarina State, Brazil.
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