Hello. I had a glitch where the shark attacked through my raft and started biting a net. It started because I was standing in a net by accident and the shark started attacking me, when I moved out of the way, he swam through the raft and started biting.
Screen shot: http://tinypic.com/r/2lue7nk/9
Also, not sure if this is a glitch or intended... But you can no longer fall into nets, but the game still considered you inside because your get fatigued and the shark can attack.