A Siamese fighting fish/betta? Yes! They cannot survive in salt water.
fresh water
No , some fish live in slat and fresh water but the pet fish you have or want to hve need fresh water.
They need a 5+ Gallon tank and you can only have one in the same tank.
Saltwater fish require salt water, and fresh water fish need fresh water, you can't mix them, or the fish will die. You need to look at each individual fishes needs as to what temp they need their water to be. There are some saltwater fish that can survive in fresh water, but it is not healthy for them.
Fresh Water
it's actually both. there are fresh water puffers and saltwater puffers and brackish water puffers. the fresh water ones tend to be large (2ft for some species) for a more accurate answer i need a species name for the puffer
No they need fresh water with this top fin water conditioner that's what I recommend bc that's what I use with my tropical fish
If you wish a fresh water fish to be kept alive and well so that it may be studied or kept as a pet. The fish will need to be placed in a suitable container with suitable water that has suitable parameters. Without water a fish will die just like you would die if your air supply was removed. If the fish was a fresh water fish and the water was salt as opposed to fresh, to the fish, it would be similar to what would happen to you if someone put poisoned gas in your personal air supply. You would be extremely ill and then die. So would the fish.
Freshwater fish need regular water without salt, Marine fish need salt water. Marine fish are more colorful and interesting then freshwater fish but they are a lot harder to look after than freshwater fish. Saltwater fish need more water to swim in and are more fragile than freshwater fish.
No just fresh water and a loving home! :)
yes all fish need it in the water and at the surface a fresh supply of it is always better
True salt water (marine) fish do not have the required evolutionay developments to cope with living in fresh water. Brackish water or Estuarine fish can be aclimatised to live in fresh water for a considerable time but eventually they will need a return to salt water otherwise they get sick.