His grandson, Wada Kakuemon Yoriharu, later known as Taiji Kakuemon Yoriharu, invented the whaling net technique called amitori-shiki (網取り式).Instead of trying to harpoon whales in open water, now twenty or more boats would encircle a whale and make a racket, driving it towards the shallows into nets wielded by a second group of six boats.This decline of coastal stocks resulted not only in financial solvency of many industrial groups but also in disputes between feudal domains in western Japan that required the intervention of the shogunate.
During the 20th century, Japan was heavily involved in commercial whaling.
This continued until the International Whaling Commission (IWC) moratorium on commercial whaling went into effect in 1986.
Wada Chubei Yorimoto established a fishery by organizing the group hunting system in 1606.
Whalers would spot whales from stations along the shore and launch boats to catch them with harpoons and lances.
There harpooners would approach in four boats of their own.