Farm them.
Next good crop should be around 55 years from now.
looks like they farm well and have for quite a while. And farms have been commercial founded in the 90's
Farming
An abalone farm
Farming of abalone began in the late 1950s and early 1960s in Japan and China.[10] Since the mid-1990s, there have been many increasingly successful endeavors to commercially farm abalone for the purpose of consumption.[11] Over-fishing and poaching have reduced wild populations to such an extent that farmed abalone now supplies most of the abalone meat consumed. The principal abalone farming regions are China, Taiwan, Japan, and Korea. Abalone is also farmed in Australia, Hawaii, Canada, Chile, France,[12] Iceland, Ireland, Mexico, Namibia, New Zealand, South Africa, Thailand, and the United States.[13]