When does fishcake go bad? Ever?
I assume it lasts damn near forever in its packaging. But once opened, how long is it good for assuming you've got it wrapped up tight in the fridge? I've got some in my ramen right now. Probably more than three weeks old. But boiling kills everything. Right?
I assume you're talking about kamaboko or something similar.
If you've had it in your fridge for over three weeks after being opened, I'd toss it. I would bet that by now, it's gotten a little slimy...ugh. Boiling may kill all the nasties, but won't necessarily take care of what the nasties have left behind.