Bottled water has usually been interfered with too much. Just use tap water that has the chlorine removed. That's what the vast majority of aquarists use very successfully.
If the water does not contain enough oxygen, yes.
You can tell if your fish tank has enough oxygen for your fish by observing their behavior. If they are swimming near the surface gasping for air, it may indicate low oxygen levels. Additionally, you can use a water test kit to measure oxygen levels in the tank.
It could be because they are sick or there is not enough oxygen in the water.
No, you cannot use bottle water for your fighting fish....it has to be drinking water, but not out of a water bottle, due to the additives and the filthering process.
No, a two liter bottle is too small to support fish. Fish need a certain amount of water volume, oxygen, and space to swim and thrive. It is not a suitable environment for fish to live in such a confined space.
Because they're gills have adapted to collect oxygen from underwater<3
Fish use their gills to filter oxygen from the water. However, if the water is stagnant enough they are unable to get oxygen and suffocate(this is why most fish can't live in puddles or small ponds). Some fish have a labyrinth organ that basically acts as a human lung, so they can breathe both air and underwater and don't have to worry about this(such as betta fish).
Tadpoles get oxygen from water like fish do.
Because they don't enough oxygen to breath. They are not used to swim in cold waters.
Insufficient oxygen in water can lead to fish suffocation and eventually death. It can disrupt the aquatic ecosystem, causing a decline in biodiversity and potentially harmful algal blooms. Additionally, low oxygen levels can impact the water quality and make it unsuitable for human use.
Fish can absorb water by the gills
Like most other fish they suck oxygen rich water through their mouth and force it out of their gills located on their head and the oxygen is absorbed through the gills hope it was a good enough answer.I have a 75-gallon aquarium with six Gourami. these are known as labyrinth fish. This type of fish not only receive oxygen from the water but can also receive oxygen from the atmosphere. This is why you see them rising to the surface receiving a gulp of air.