Effect of partial substitution of fishmeal by red algae Gracilaria pygmaea on the growth performance, hematology and serum biochemistry parameters of Asian Seabass Lates calcarifer (Bloch, 1790)

Effects of dietary supplementation of red macroalgae Gracilaria pygmea on the growth performance, hematology and serum biochemistry parameters of Asian Seabass Lates calcarifer with initial fish weight of 28±5.9 g were investigated in a 6-week experiment. The experimental diets were composed of the positive control diet (containing fishmeal), the negative control diet (containing fishmeal-soy protein) and three diets which supplemented with varying leves of red algae (3, 6 and 9%). Results indicated that daily growth rate, feed conversion ratio and final weight of fish not only were not negatively affected by different substitution levels of red algae, but also the final weight of fish fed the diet containing 6% red algae was higher than the other experimental diets. Condition factor of the negative control group and the specific growth rate of the treatment containing 6% red algae were significantly higher than those of the other experimental diets (P0.05). Among the examined serum biochemistry parameters of Asian Seabass, only glucose was not significantly affected by various dietary treatments (P>0.05). The cholesterol levels of the negative control group and fish fed the diet containing 9% red algae were similar with each other and were significantly higher than the other treatments (P