The effects of light colour and photoperiod on hematological parameters in Sterlet, Acipenser ruthenus, broodstock

This study investigated the effects of light colour and photoperiod on hematological parameters in female Sterlet, Acipenser ruthenus, broodstock. A total of 36 fish were reared for 6 months under four treatments; two light colours (blue & red) and two light regimes (18L:6D &6L:18D) with light intensity of 150 Luxin three replicates. Blood parameters including white blood cells (WBC), red blood cells (RBC), haemoglobin concentration (Hb), haematocritpercent (Hct), mean corpuscular volume (MCV), mean corpuscular haemoglobin (MCH) and mean corpuscular haemoglobin concentration (MCHC) were measured during the three (Previtellogenesis, VitellogenesisandFinal maturation) reproductive stages. The results of this study revealed no significant difference (P >0.05) in different haematological parameters among the treatments. However, the levels of Hct, Hb, MCV, MCH, and MCHC were considerably (P0.05). The results suggest that reproductive stage has more effect on hematological parameters compared with light changes.