There are species-specific catch limits based on size and quantity, which differ from site to site. Here's an example from West Hawaii. You can find more on this DLNR site. You can find more info on the "White List" implemented in 2013 on that site or another excerpt here.I'm sure there are. but apparently not in terms of numbers collected and sustainability. Which is what the law pertains to. So therefore there is currently No Regulation for the topic at hand.