Abstract
The objective of this study was to evaluate if there is any influence of the seasons on the homeostasis of silver catfish (Rhamdia quelen) through haematological and serum biochemistry evaluations. During one year, blood samples were collected from groups of 40 silver catfish in each season (spring, summer, autumn, and winter), totaling 160 animals. Blood samples were collected individually and used for haematological and serum biochemistry evaluations. In general, the main haematological findings were observed in the summer and in the spring, with hemoglobin levels (6.32 g.dL-1 ± 0.20), total erythrocyte counts (1.62 x 106.μL-1 ± 0.05) and neutrophil counts (14.21 x 10³.µL-1 ± 0.60) higher in the summer than in the other seasons (p < 0.05), whereas in the spring the total leukocyte count (25.89 x 10³.µL-1 ± 1.02) and the number of eosinophils (9.08 x 10³.µL-1 ± 0.11) were higher when compared to the other seasons (p < 0.05). The levels of alanine aminotransferase (ALT), aspartate aminotransferase (AST), alkaline phosphatase (ALP), gamma glutamyltransferase (GGT), and albumin levels were significantly altered between all seasons, but remained within the normal intervals for the species. Seasonality significantly influences haematological parameters and biochemical parameters of Rhamdia quelen, but without a clear determination of the types of change in each season.
Highlights
Due to the lack of haematological and biochemical reference values for the different species of fish, and consequent difficulty in interpreting the data, haematological analysis are often not used in the practice of commercial aquaculture (Clauss et al, 2008)
Even with the facts highlighted above, haematological evaluations may be useful when monitoring the health status of fish, whereas the factors that may influence cell counts are taken into consideration
This project was approved by the Animal Ethics Committee (AEC) of the Pontifícia Universidade Católica do Paraná (PUCPR) under number 641 - 2nd version
Summary
Due to the lack of haematological and biochemical reference values for the different species of fish, and consequent difficulty in interpreting the data, haematological analysis are often not used in the practice of commercial aquaculture (Clauss et al, 2008). The different biochemical and cellular constituents of the blood are important in the physiological and pathophysiological evaluation of the animals due to the various alterations induced by different stressors, like physiological or environmental factors (Ranzani-Paiva, 2007). These external influences may occur for example through variations of temperature, salinity, pH, dissolved oxygen and luminosity (Tavares-Dias and Moares, 2004; Valenzuela et al, 2007; Bowden, 2008)
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