コンビニエンスストアからの廃棄食品のキタムラサキウニに対する餌料価値の検討

抄録

With the aim of effectively utilizing north sea urchins removed from the sea-urchin barren grounds and reducing food waste, the feeding value of discarded fried chicken and rice balls from a convenience store for north sea urchins was examined. After 56 days of rearing, a comparison of gonad index, gonad coloration, taste, and free amino acid content in north sea urchins revealed that when fed with diets adjusted from fried chicken, their gonads exhibited a relatively bright yellow coloration, but were accompanied by a higher content of valine and methionine, resulting in a pronounced bitterness. In contrast, when fed with diets adjusted from rice balls, although the gonad indexes were smaller in size, the gonads had a sweet taste without bitterness, and there was a minimal amount of remaining food. When fed diets comprising equal amounts of rice balls and fried chicken, the north sea urchins exhibited higher gonad indexes, mitigating color and taste shortcomings observed when each diet was provided individually. Based on the above results, it is considered that these two types of food waste can be potentially utilized as suitable feed for north sea urchins by either mixing them or, if mixing is not feasible, providing fried chicken to enhance gonad indexes, followed by rice balls to improve taste. This approach may enhance the utilization of north sea urchins by either mixing them or, if mixing is not feasible, providing fried chicken to enhance gonad indexes, followed by rice balls to improve taste. Such approaches may contribute to optimizing the utilization of north sea urchins with waste as an advantageous feed source.