How many eggs do fishes lay?

The answer to how many eggs does a fish lay really depends on the type of fish that you are asking about. Some species on lay a few dozen while others will lay thousands in order to try to ensure their species survival.
Fish can lay 2-500 eggs at a time, it depends on the species. That's why there are so many fish in a school of fish!
Usually, about 50-200. The fish lays eggs in a simple way. Take the salmon for example. It makes a nest with it's tail then the male fertalizes the eggs and she lays them in the nest. The female die shortly after spawning(laying eggs). That is how this fish lays eggs. Actually, it depends on the fish. Some fish, like salmon, lay only a few hundred eggs. But generally, marine fish lay more eggs. Some marine fish lay millions of eggs.
50-200 (usually)