If they are in a tank, make sure they are fed and the water is clean. To clean the tank, remove the fish and put them straight into another source of water. Remember if your fish is salt or fresh water.
If the fish is in the sea, river or pond, its best to leave it.
If the fish is on land near a water source, replace it in there. If it is nowhere near a water source, I have no idea how it got there. You would have to leave the fish then. Sorry if this answer is vague, because your question was as well.
Often, it is because the fish is suffering from an incurable disease with a very poor quality of life.
Yes. Depending on the fish, but all fish can freeze if the temperature of the water reaches a certain temperature.
I have never heard of any fish suffering from one sided paralysis but it may be possible if the fish suffered has a nasty accident or has some kind of stroke.
Ate people Albert Fish was diagnosed suffering paranoid psychosis. His delusions became religious for some time with self-torment practices.
To humanely bleed a fish, you can quickly cut the major blood vessels near the gills to ensure a swift and painless process. This helps to minimize suffering and maintain the quality of the fish for consumption.
Freezing a fish is not considered a humane method of euthanasia. It can cause distress and suffering to the fish as they slowly lose consciousness and eventually die. It is recommended to use more humane methods such as using anesthetic agents or physical methods to euthanize fish.
Some fish do it to remain motionless to either help ambush or avoid detection. Some do it only when stressed. Some do it when in state of rest.
Death, usually, often after a period of unimaginable suffering. Star award for dumbest question of the day...
If you're taking about a fish I would wrap it a paper towel and put it in the freezer for thirty minutes. Then flush it.
Omega 3 fish oil is recommended for healthy joints, painkiller for those suffering from Gout.the consumption of fish oil capsules should not be confused with eating a lot of sea foods,they are a definite problem with gout. fish oil supplements do help with gout.
Your guppy might be suffering from swim bladder disease. If you have any more guppies i would keep an eye on them.
Mainly, Suffering The way suffering begins End suffering The way to end suffering