I am a scuba spear hunter, deepsea fisherman, and this is just sad. A fish this size is producing thousands of babies, and now it's dead and wasted.
It appears, regardless of what they said, that no one had any regard for saving that fish - it was just a stupid mob.
I really think that a felony is overkill, but a higher fine and community service (hundreds of hours) would be good for all. They both should be there right in the middle of their community at that Pier, telling them what the protected species are and why their are conserved, and how to catch and release.
Unfortunately, "catch and release" ends up torturing and killing the fish anyway, but simply cutting the line as close to the fish would have been far better than this mess.