Haematological parameters in the rainbow trout, Oncorhynchus mykiss, in cage culture
1997
Rehulka, J. (Jihoceska Univ., Vodnany (Czech Republic). Vyzkumny Ustav Rybarsky a Hudrobiologicky)
The dynamics of the red blood cell count (RBC), haemoglobin (Hb), haematocrit (PVC), mean cell volume (MCV), mean cell haemoglobin (MCH) and mean cell haemoglobin concentration (MCHC) were checked in 77 (1+) rainbow trout, Oncorhynchus mykiss (Richardson), of the Kamloops strain (18 months old) at an average total body length of 240 mm and weight of 230 g in fortnightly intervals during the period form June to September. All the parameters, except for the MCV, showed significant peaks during the first ten-day period of August; this was in correlation with the increase in water temperature (22 deg C), dissolved oxygen content (9.9 mg/l), oxygen saturation (112 %) and BOD5 (4.4 mg/l). The dependences of Hb and MCH on oxygen saturation (Iyx=0.755 and Iyx=0.770) and of MCH and MCHC on the oxygen content (Iyx=0.870 and Iyx=0.869) were found to have a parabolic pattern. Rainbow trout was reared in floating net cages at temperatures between 17 and 23.5 deg C.
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