Not to bring some common sense into this thing or anything, but why shouldn't fisheries guys be armed? As I understand it they operate out in wild areas, and I personally would rather not get turned into an all-you-can-eat buffet for a bear or mountain lion, or hell, even an overly aggressive shark that you accidentally landed when trying to take a sample of a particular fish. Then for the guys operating on high seas in and about the coasts there's of course the ever-present issue of small-scale piracy which despite popular belief is still an issue in areas like the Caribbean and Gulf of Mexico.
Those are places I wouldn't go unarmed and I wont demand someone else do so just because of their employment.
Few things here. First, Fisheries handle open water, not state waters like lakes and such, if I'm not mistaken, so they're not dealing with locations in which facing down a bear is really a concern. And you don't accidentally land a shark on your boat. Not one big enough to require a gun and even if you did, you don't shoot at your deck.
Second, I don't have a problem in the world with anyone carrying a weapon for self-defense, no matter what position they work in, from kindergarten teacher to clerk in the secretarial pool at the FBI. But most federal employees are prohibited from carrying firearms at their place of employment (including many soldiers on base). Which is ludicrous.
Third, government employees tasked with monitoring non-violent and/or misdemeanor offenses (like fishing for reds during a closure or feeding dolphins, which is what Fisheries does) or that don't have the powers of arrest, have NO BUSINESS bringing a weapon to bear on civilians. Period. Mailmen deal with more obnoxious folks and face far more danger by going into bad neighborhoods than any fisheries agent has ever faced in the 30+ year history of their existence. You want your mailman enforcing postal codes with a gun?