Stream mouths and waters near fishing boats are higher risk areas because these are preferred hunting grounds for the great predator, and a shark may mistake a human for more appetizing food. Also watch out for lion or rock fish. These spiny fish on the sandy bottoms near tide pools and rocks. They won't bother you unless you step on them. Their sting's effects can be mild to severe, so do seek medical attention if you have this misfortunate encounter.
Moray eels are another possible danger.
They look scary, especially in that an eel's mouth open and closes in breathing, looking like it wants to take a bite out of you. It's easy to avoid a bite from an eel. And, if you are spear fishing, don't dangle your catch close to your body. Use a float, so if an eel decides to snatch on of your fish, it won't grab your hand by mistake. Eel's teeth are concave, so if you do get bit, don't pull away.