The physical properties, including erythrocyte numbers, leucocyte numbers, and differential ratio, pH, pCO2, pO2, O2 saturation, haemoglobin levels, haematocrits, and mean cell volumes are recorded for the red-winged blackbird (Agelaius phoeniceus).

The aim was to contribute to the valorization of the alternative sources of animal protein. More specifically, it was question to evaluate the effect of substitution of the fish meal by the maggot meal on the survival, growth performances and food production cost of Clarias jaensis. To this end, 120 fingerlings were divided in four groups (T0, T1, T2 and T3) repeated 3 times and receiving 0, 50, 75 and 100% of maggot meal. The fish were fed to 5% of ichtyo biomass for 3 months. The treatments did not have any significant effect on survival, FC, SL, LW, WG, ADG and SGR (P>0.05). However, the values of the LW (145.12±20.72), WG (104.12±20.72g), ADG (1.16±0.23g) and SGR (1.39±0.14) were higher with T2. The CI (1.46±0.04) of this same treatment were weaker and the condition factor K (1.19±0.22) was higher as compared to other treatment (P<0.05). However, the lowest value of the cost of feed consumption and feed production was recorded with the T2 ration (75% of maggots meal) and highest with the control ration T0 (0% of maggots meal) (P<0.05). This study revealed that incorporation of the maggot meal in feed increases the growth performances of Clarias jaensis fingerlings.