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.
Blue whales, sei, Bryde's and sperm whales were however also taken when possible.
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Oka traveled the world gathering information about whaling practices including to Norway for harpoons, cannons and expertise.
He also established the first modern whaling company in Japan in 1899, Nihon Enyo Gyogyo K. which took its first whale on February 4, 1900, with a Norwegian gunner, Morten Pedersen.
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.
There harpooners would approach in four boats of their own.
The nets made escape more difficult and, in its struggle to escape, the whale got tired sooner.
On January 15, 2017, a helicopter in the Australian Whale Sanctuary photographed the Japanese whaling vessel Nisshin Maru with a freshly-killed minke whale on its deck.
Antarctic minke whale have experienced an apparent decline in population, though the International Union for Conservation of Nature (IUCN) indicates that it lacks sufficient data to confer a "threatened" designation on the species of minke whale.
Supporters of the Japanese whaling tradition claim that the experience is both humble and emotional, and all parts of a whale are used, unlike westerners of the past who hunted only for whale oil.
In addition, Japan has strictly controlled catch quotas, and whalers have never hunted juveniles or cow/calf pairs due to their respect for whales.
Although the primary use for whales was meat, the entire whale was used in a variety of products including lamp oil, soaps, fertilizer, folding fans (baleen), and more.