All lobsters must be measured immediately, and any undersize lobster must be released immediately into the water. Divers must measure lobsters while in the water and undersize lobsters cannot be removed from the water. Hoop netters must measure lobsters immediately upon removal from the water. No undersize lobster may be placed in any type of receiver, bag, or any other type of container; no undersize lobster may be kept on the person or retained in any person's possession or under his or her direct control. CDFW's How to Measure a California Spiny Lobster video provides instruction on how to measure spiny lobster.