Development of a New Type of Fish Diet, Non-Fish Meal Extruded-Pellet

We developed a non-fish meal diet using plant and/or animal protein materials. Threekinds of non-fish meal diets and a control diet containing 50% fish meal were processed. In the non-fish meal diets, the fish meal was replaced with commercially available plant or animal materialsand supplemented with taurine and materials for maintaining palatability. These diets were fedto one year old yellowtail (BW 753±96g) in net cages. There wasno difference in growth, dailyweight gain, daily feeding rate, feed conversion ratio and protein efficiency ratio among the diets.Non-fish meal diets were processed in a factory and dietary properties were studied such asuptake, stomach evacuation rate, and comparative disease resistance in fish fed the experimentaldiets. In addition, palatability of each substitute protein material for fish was examined andmaterials to enhance palatability of the non-fish meal diets were clarified. Non-fish meal diets havethe potential to support the growth of one year old yellowtail.