How long can you keep fish in the fridge?
Depends how fresh it was when you got it - I would not go more that 2 days though and I would give it a sniff - if it smells fishy it has to go - when in doubt throw it out!
You've heard the expression, "Fish and visitors stink after 3 days?" 2 days max.
Two days is fine, but three is the threshold.
...and for supermarket fish, one day as it's already been hanging out awhile.