Abstract
This study aimed to determine the variables leukocytary, erythrocytary, frequency of micronuclei and nuclear abnormalities in peripheral erythrocytes of Prochilodus argenteus, Pimelodus maculates and Myleus micans from São Francisco river basin, Minas Gerais State, during the summer and winter. Thrombocytes, hematocrit and leukocyte of P.argenteus series, was influenced by climatic conditions. In P. maculatus, not were significant differences for all leukocytes and thrombocytes. In M. micans, values are unprecedented in the literature, with MCV and absolute number of leukocytes found superior to other species of the family Characidae. The frequency of micronuclei and nuclear abnormalities in erythrocytes, the three species not showed seasonal differences between the sites. However, the highest values were found in summer. Furthermore, we observed a positive correlation between the increase in the percentage of micronuclei with nuclear abnormalities.
Highlights
The hydrographic basin of São Francisco river occupies 631,133 km2, which represent 7.4% of Brazilian territory (PAIVA, 1982) with wide and diversified ichthyofauna
In the São Francisco river the Ht value was higher during the summer
It is expected that eventually the hematological values may contribute to assess the effects of pollutants and can be used to monitor environmental quality in rivers and captivity
Summary
The hydrographic basin of São Francisco river occupies 631,133 km, which represent 7.4% of Brazilian territory (PAIVA, 1982) with wide and diversified ichthyofauna. Godinho (1993), Britski et al (1988), Sato and Godinho (1999), Alves and Pompeu (2001) reported 184 species from the fish orders. Clupeiformes, Characiformes, Siluriformes, Gymnotiformes, Synbranchiformes, Cyprinodontifor mes, Perciformes characterized as endemic species. The ecophysiological parameters of these fish are practically unknown, and eventually this characterizes a limitation for. Knowledge of biochemical parameters is important to understanding ecological interactions and the relationship between endogenous and exogenous factors and may serve as an indicator of health and effects of pollutants. The use of these parameters is limited by the lack of knowledge of normal values to comparisons, the ichthyohematology is indispensable (RANZANIPAIVA; SILVA-SOUZA, 2004)
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