They use their swim bladder to keep them at a specific depth and their fins to keep them stationary in a current flow. (Like a bird uses its wings to hover).
It might be sleeping, or it has a disease(don't know which kind though, sorry). Sounds like it is on it's way out. Do frequent water changes and see if the fish recovers, but make sure the water is the same temp as the tank water! You don't want to stress a dying fish!
The fish is ill and may need to be treated with antibiotics, or the water quality is bad due to lack of maintenance
If you mean the fish is having buoyancy problems, chances are that it's a water quality issue. Make sure that you are changing at least 50% of the tank water every week, and using a water conditioner per the dosage on the bottle when you change the water.
No, fish gills do not move when they are dead. When a fish dies, its gills stop functioning, as they require the fish to be alive in order to extract oxygen from the water through the process of respiration.
dont you mean saltwater fish?
it means your swimming in a pool with dirty water and fish.....get out!
If the water freezes but the pond is deep enough for the fish to still be in water at the bottom there is a good chance they will survive. If all of the water freezes however and the fish become frozen solid then I'm afraid they are unlikely to survive.
I HAVENT AND MY FISH ARE STILL ALIVE (THE REMAINING ONES I MEAN)
No! Well, that depends on what you mean by a fishbowl. If you literally mean a bowl with marbles and water like you would use for a goldfish or a betta, no. If you mean an aquarium with plants and an actual heater and filter, then yes. Hatchet fish make good freshwater aquarium fish.
It means it is something you can do well and are really good at. It should mean you are natural at doing something, just like water is a natural habitat for a fish.
It could mean that you have had a bad encounter with a fish, or a body of water before.
If by clear water you mean freshwater than the fish will have all sorts of problems. It will be more likely to get a disease, stress the fish out, weaken its immune system, and will kill the fish.