"Lifeguards have the authority to ask you to move if you are spearfishing in an area where there are a lot of swimmers. Spearfishing can be considered a hazardous activity.
Crystal Cove State Park (949-494-3539) asks that spear fishermen adhere to all Fish and Game laws - which they strictly enforce. They also ask that you take time to familiarize yourself with the size, take and season limitations for any specific species you are pursuing. Please also exercise the good conservation ethic that all of us spear fisherman adhere to. Take only what you need. If size is in question, before pulling the trigger, it's better to let it swim away.
The following fish may be caught in the Laguna Beach Marine Protected Area: rockfish, greenling, lingcod, cabezon, yellowtail, mackerel, bluefin tuna, kelp bass, spotted sand bass, barred sand bass, sargo, croaker, queenfish, corbina, white seabass, opaleye, halfmoon, surfperch, blacksmith, barracuda, sheephead, bonito, halibut, sole, turbot and sanddab. All other marine life species are prohibited and nothing can be taken from the intertidal area."
Marine Life Protection Act Initiative
About 3/4trs down the page.