Effect of the combination of raw coho salmon-bowels to extruded pellet on the digestibility of dietary nutrients for coho salmon

摘要

Coho salmon-bowels are disposed as waste derived from food processing industry. Present study was conducted to assess the digestibility of dietary nutrients in extruded pellet (EP) containing 10 and 20 percent raw coho salmon-bowels on coho salmon, Oncorhynchus kisutch. The test fish weighing 46.6 g on average at the start of the experiment, was reared for 11 days. There was no difference in apparent digestibility of dietary protein and Hpid between the diets, 93 percent and 95 percent, respectively, while the digestibility of dietary starch of the control and the fish fed the experimental diets containing 10 and 20 percent raw coho salmon-bowels were 77 percent, 77 percent and 82 percent, respectively. These results suggested that 6 percent offishmeal and total amount of fish oil can be replaced by raw coho salmon-bowels, since EP containing 20 percent raw coho salmon-bowels can be used for coho salmon.