Named as a lugworm with a lot of hairs, rockworm is also known as clam worm and bobbit worm. It has relatively a longer survival and is a creature with excellent purification ability through vigorous activities that change the organic composition of low-quality substances. They are distributed in various countries, including South Korea, and the appearance and shape differ slightly for each region, so they are called by various names. They can be enjoyed for fishing almost all types of fish, and they are particularly useful for fishing snappers. Production is mostly natural and has significantly decreased, so we are currently distributing rockworm that we successfully raised for the first time.