Here is my condensed rules Cub Scouts should know about for the Fishing Belt Loop and/or Pin:

Anyone 16 years and older must have a fishing license to take any kind of fish, mollusk, invertebrate, amphibian or crustacean in California, except for persons angling from a public pier in ocean or bay waters. A license is required to take reptiles, except for rattlesnakes.

Possession and Display of License:

Section 700. (Title 14, California Code of Regulations). (a) Display of Sport Fishing License: Every person, while engaged in taking any fish, amphibian or reptile, shall display their valid sport fishing license by attaching it to their outer clothing at or above the waistline so that is is plainly visible, except when diving as provided in Section 7145 of the Fish and Game Code.
Persons diving from a boat or shore may have their license on the boat or within 500 yards of shore, respectively (see Fish and Game Code Section 7145).  * The law now provides for a minimum $250 fine for fishing without a license.

Enhancement (additional fee) Stamp is required for some type of fish and places.

There are different Laws for Fresh and Ocean water fishing.

All fish must be caught with a rod and line with max. of 3 hooks, no nets.  Most live fish bait in fresh waters is illegal, check the law for the waters you are fishing.  To keep a fish caught, check that the fish is a type that can be kept, also that it meets the min. size requirement and know the limit to the number you may keep.

Complete Fishing Law booklets are at:
http://www.dfg.ca.gov/about/fishing/

http://www.dfg.ca.gov/fishing/

http://www.fgc.ca.gov/regulations/current/fishregs.asp#License