Author(s): Nasreen M Abdulrahman
This study was carried out to study the effect of adding different levels of the alga Spirulina spp. in fish laboratory of Animal Production Depa rtment, Faculty of Agricultural sc iences of Sulaimani University, Sulaimani, Kurdistan region, Iraq. Using 72 common carp fingerling weight 45±2 gm, to test the effect of four different levels of the algae Spirulina spp. The control treatment T1 with 0% Spirulina spp., (T2) adding 1 gm Spirulina /kg diet, (T3) with 3 gm Spirulina /kg diet, and (T4) with 5 gm Spirulina /kg diet. Each treatment in three replicates in which six fi ngerlings common carp were st ocked in each aquarium. Results indicated that forth treatment higher significant than other treatments in weight gain 6.89, Daily growth rate 0.17, Specific growth rate 0.147, Relativ e growth rate 15.31 and Fo od conversion ratio 2.14 for the control; while, Food effici ency ratio showed significance in T3 and T4 (62.48 and 62.47) respectively.