As far as value goes, I don't particularly value my own life or that of a fish. I do value the suffering of both while living though, as in I want to minimise that as much as possible.
Don't get me wrong, in general I'm not a cynical person and have most things one would wish for. I just don't think life is worth anything in itself and being alive is just a chance of experiencing or producing needless suffering. The (incredible) good feelings don't make up for all the bad ones that exist.
If someone where to kill me, I'd be glad it's over. While being alive I'd feel bad for my loved ones of course, but if I'm dead I wouldn't be able to feel that. I know that is kind of selfish, so I would try not not to kill myself as I have too much responsibilities, but if I'm just being honest, one can dream.