Being the good parent that you are, you have probably studied and memorized the normal movements and behaviors of your goldfish. If Goldie happens to become ill, look for signs that differ for their normal swimming patterns.
If your fish is shaking, hiding in corners and isolated places, gasping for breath near the surface of the tank, has his fins pressed together in a clamped fashion or demonstrates any other strange behaviors, it might be a good indicator that he’s coming down with an illness. Once you’ve noticed these odd actions, take a closer look at your fish and see if there are discolorations or markings on his body.
Fish with certain parasites might have red and inflamed areas, sometimes around the gills, or might have swollen blood bumps on eir bodies. Check for damaged fins, cloudy eyes and bumps or blisters that appear on the scales.
There are many common goldfish ailments that can be identified by examining your pet’s physical appearance. Once you have identified that there is definitely something wrong with your fish, it is a good idea to isolate him from your other fish in a hospital tank.
The hospital tank is prepared in advance and made to match the current environment of your fish, so that he won’t go into shock. If the ailment turns out to be contagious, it’s not a bad idea to treat your other fish as well as the sick one.
Unfortunately, some fish, no matter how hard you try, do not overcome their illness and continue to suffer until they pass away. Many people do not like to see their fish in constant pain and fell that euthanasia is appropriate. There are many methods out there for ending the life of a goldfish, so be sure to choose one that does not cause your fish even more pain.