Rockfish is a common term for several species of fish, referring to their tendency to hide among rocks. The name rockfish is used for many kinds of fish used for food. This common name belongs to several groups that are not closely related, and can be arbitrary.
From all animals of water we are allowed to eat :
1. Fish which has or had scales on it. Fish which has no scales at all are not allowed to eat.
2. Shrimps or prawns.
All other water animals e.g. crab, oyster, shells, lobster, ink fish etc is not allowed to eat.