As a law student, I insist on a defition of anything before I can agree or disagree to it. That's the fundamental flaw in a lot of debates - the issue is never properly defined. Yeah, yeah, I'm a nerd. 8D
Based on my definition of bond, which is a two-way connection of affection, then I don't think my fish and I bond. Their little fishy brains see me as a source of food, and possibly amusement (they always seem curious about what I'm doing), but I don't think they love me - that would be anthropomorhising them to an unrealistic degree. That's fine though - I love them. I cry when I lose a fish and get ridiculously happy when I get new fish. I am grateful for the beauty and happiness they bring to my lives. And I totally agree with Zubin - better to anthopomorphise your betta and love it lots than to do the opposite. :)
I experience the same issue with my rats. Occasionally I'll whinge to somebody about a vet bill, or rave about my ratties being adorable. My friends have learned to accept that part of my personality, but people I'm not as close to don't get it, and if I say that one of my rats is sick, I've been told everything from "Just let it die" or "Get a new one", and of course, people have no idea how hurtful that is.
I have absolutely bonded with my rats. They demonstrate happiness in my presence and affection towards me. When my darling boy Hyde was sick, he was in constant distress if he didn't have anyone with him, so I slept on the sofa with him and had him in my arms for three days straight, only taking breaks when someone else could be there to take over so that I could eat or use the loo. Even after that, if I put him down on my lap, it wasn't good enough for him - he'd stand up and tug my shirt until I held him up against my chest and gave him a proper cuddle, then boggle his silly eyeballs out. Even 4 months after his death, I miss him like crazy.
People have no idea how hurtful it is to simply act as if your pet is disposable, no matter whether it is a fish or a rat. In part, I think it's due to the seriously warped state of humanity, where animals are just disposable to so many people, and those of us who think otherwise are treated as nuts.