The well-drained katsuobushi could be prevented from decaying during long-term preservation, but it continued to be troubled by pests, including buffalo bugs, as well as by harmful mold.
水分を十分除去した鰹節は長期保存での腐敗は防止できたものの、カツオブシムシなどの害虫の発生と、有害なカビの発生に悩まされ続けた。