This will depend on what type of fish you have. Goldfish are egg laying fish, so they do not get pregnant.In other cases, where livebearing fish are concerned, just being certain to keep their tank water the best it can be is most helpful
in salt water
the most common salt water fish is sardines
New England depend on the ocean for fish and fresh water. They depend on the forest for wood and protection from enemies.
Water, fish, transport, flooding deposits, and crocodiles.
Most salt water fish will die if placed in fresh water.
the name of the salt water fish is not given. more to the pointy is that gold fish are fresh water fish- therefore salt water fish other than anteroom's or catadromos fishes would eventualy die. These fish die because the salt water is cooler than claen water. Also, it would depend on what the temperature of the tank was before you changed it.
According to the National Oceanic and Atmospheric Administration, the most common Freshwater Fish is the carp. The most common salt water fish is the bristle mouth.
depend on what type of fish
They might - this will depend on the quality of the water and the health of the fish
This link lists the most common fresh water aquarium fish (excludes salt water fish), there are hundreds.
This will depend on the fish; sometimes fish are unhealthy when you buy them, or they were weaker than the other fish in the tank and they became ill from an infection or water quality issue.