What fish? You need to explain your question a little bit more if you want an answer.
If cartilaginous fish stopped swimming they would die. These fish need to be swimming to feed and keep their bodies hydrated.
You for it will die
we would all die, mwuhahahahaha
The supernova must be at most 3000 light years away from Earth to have any effect on us. If it is, the ultraviolet and gamma radiation will scorch everything on Earth, and kill all the phytoplankton in the ocean. If the plankton dies, all fish die. If fish die, all fish-eating land animals die, and so on until all animal life on Earth is dead. Plants may survive. If the supernova is 100 light years away, it will obliterate the planet itself.
All would be fine and no one would die at all :)
all the fish would die
They will die because their is no more.
the fish will DIE!!
The Fish will die.
Fish would die. There are species of fish that live off the algae.
Many fish will die
the plankton population would decrease
It will die!
They will die. I did it once and my fish died.
they will all die (or get cooked)
they will all die (or get cooked)
The fish will get sick and die.