As I understand it your legally allowed to to take non-lethal action to ward off seals and sea lions if they're trying to grab your fish.
However, be careful what you do and when you do it. I got a ticket years ago for simply driving past a bunch of sea lions that were rafted up on a log boom and honking my horn. The federal officer cited me for harassing them. I got it dismissed in court but still it was hassle.
As for the birds I already keep hot sauce handy for those guys but suspect that too would be viewed as illegal.