In October 2022, the Board of Land and Natural Resources initiated new oposed manta ray viewing rules that would limit tours to 24 commercial boats, bringing a total of 60 passengers to each site per day.

Source: https://bigislandnow.com/2023/06/18/big-island-manta-ray-tour-operators-mixed-about-proposed-rules-possible-new-law/

Previous work frok MMF has found a steep decline in manta ray sightings in Mozambique over the past two decades, highlighting it as an at-risk population.

Source: https://www.forbes.com/sites/melissacristinamarquez/2023/01/16/new-study-confirms-a-world-first-international-migration-of-reef-manta-rays/