<b>Hematological characteristics of Brazilian teleosts. I. Red blood cell and doses of blood plasma cortisol and glucose in <em>Colossoma macropomum</em> species in culture condition</b> - DOI: 10.4025/actascibiolsci.v20i0.4466

Abstract

Thirty approximately one-year-old sexually immature specimens of Colossoma macropomum Cuvier, 1818 (Osteichthyes: Characidae), total weight 500 to 700g, 25,0 to 30,2cm in standard length were used in this research work. Specimens were captured from tanks of Usina São Geraldo Fish Farm, Sertãozinho (São Paulo State, Brazil) and came from a single spawning. Average values for total count of erythrocytes, hemoglobin, hematocrit, mean corpuscular volume (MCV), mean corpuscular hemoglobin (MCH), mean corpuscular hemoglobin concentration (MCHC) were determined. Plasma glucose and cortisol were dosed. Results showed that the total count of erythrocytes in Colossoma macropomum was 2830.6 x 10³/μl, hematocrit 41.6%, hemoglobin concentration 11.3g/100ml, MCV 150.0%, MCH 41.4pg, MCHC 27.7%, plasma glucose 116.7mg/dl and cortisol 182.1ng/ml. The number of erythrocytes presented positive correlation (α=0.05) with the hemoglobin rate and a highly positive correlation (α=0.01) with the hematocrit percentage while the hemoglobin rate showed a highly positive correlation (α=0.01) with hematocrit percentage.