Effects of Arthrospir platensis on growth, skin color and digestive enzymes of Koi, Cyprinus carpio

This study evaluated the effects of diets containing 0, 2.5, 5, 7.5 and 10% Arthrospir platensis on skin pigmentation, growth performance, and digestive enzymes of koi, Cyprinus carpio. A completely randomized design was performed with five treatments and three replicates. One hundred and fifty koi fish with average initial weight of 30±1g were assigned to fifteen experimental tanks. The experiment lasted for eight weeks. Koi fish fed with 2.5% A. platensis (1.17±0.02) showed a significant lower growth performance than those fed with 7.5 and 10% A. platensis (1.39±0.02 and 1.46) (p