In the ensuing peace even the "unpredictably ferocious" Otago harbour Māori modified their behaviour in the interests of trade. Their kin at Ruapuke not only held their traditional monopoly over the sooty shearwaters, or New Zealand muttonbirds, but had effectively monopolised "te tongata bulla" and its wealth. Some 15 to 20 Europeans, many of them with Māori wives, lived on Codfish Island although they moved freely among the Māori "kaiks" on the mainland. These Europeans complied with Māori customs for fear of triggering that much-feared "touchiness". The "Journal" of John Boultbee,