How to Know if Your Pet Fish is Sick?

Pet fish

There are many ways to determine if your pet fish is healthy. Here we have listed some basic indicators indicating that the fish is either sick or injured and needs immediate attention.

Discolored Fins

Discolored fins are a sign of stress. Stress can be caused by a number of things, including changes in the environment or diet. Changes in water quality and temperature are common causes of stress for fish and any other changes that affect their environment. In addition to temperature and water quality, diet is another common source of stress for fish owners who feed them too much or too little food at one time.

Fish Breathing Abnormally

If your fish is breathing rapidly, then it might be sick. Fish that are sick will often breathe through their mouths or gills. If you see your fish breathing rapidly and not through the gill slits, it’s likely to be ill. On the other hand, if a fish breathes through its mouth and gills simultaneously but not through its gill slits, this could also mean something is wrong with your pet.

Reddened Eyes and Skin

If your fish’s eyes and skin appear red, this can signify an infection. Parasites or bacteria often cause infections in goldfish. When a fish becomes infected, it is not uncommon for the parasite or bacteria to infect other organs in the body. This can result in various symptoms, such as reddened eyes and skin, loss of appetite, and lethargy (lack of energy). If you see these signs with your goldfish, they should be taken to the vet immediately to treat them appropriately.

Fish Pecking On Something in the Tank

If your fish is pecking at the tank’s glass, gravel, or plants, it may be trying to tell you something. This behavior can indicate stress in your fish. If this is a new occurrence and not a symptom of an illness, try changing their diet (e.g., feed frozen or pellet food rather than live foods) and increasing the temperature of their tank.

If your fish has been doing this for quite some time without any noticeable changes, it could mean something else is going on with them physically or mentally. Check for signs of disease like cloudy eyes, fungus on their body, and blood in their water.

Changes in the Food Intake of the Fish

If your fish is not eating or eating less than usual, there could be an underlying problem. The first thing to do is check how much food your fish usually eats. If it does not seem like the amount of food your fish normally consumes has changed, but the behavior of your fish is different—like if he’s hiding in a corner or floating around at the top of his tank—you should be concerned and keep an eye on him.

If you notice that your fish has been stuck in one corner of its tank for more than three days, don’t assume it will go away. Instead, look into ways to help him feel better, such as using aquarium salt or putting him in a hospital tank so he can be treated by a professional veterinarian if necessary.

Bloated Belly

If your fish is bloated, it may have an infection or other health problem. The signs of bloating include an unusually large or swollen stomach and scales and skin that appears “puffed up.” If your fish has a bloated belly, you should take it to the vet immediately. If there are no symptoms of illness (but your pet fish does have a bloated belly), you can try treating the bloating at home by increasing their water flow and adding more oxygenation to the tank with an air stone or filter pump.

In case these methods don’t work for your bubbly buddy, get ready for some difficult news: Fish cannot vomit like humans do when they have eaten something bad. If he hasn’t gotten better on his own after taking care of him at home for several days—and if symptoms persist—it’s time to head back to the vet clinic. They will likely recommend euthanasia due to possible organ damage caused by gas build-up inside the body cavity.

Fungus Growth On the Fish

Fungus is a common problem that can be treated with medications. To prevent it, keep your tank clean and don’t overcrowd the tank.

It’s important to note that fungus growth won’t kill your fish or cause serious health problems for them. However, if left untreated, it might cause their scales to fall off and lead to infection of other organs in the body. If you notice that your fish has developed fungus growth on its body or fins, then consult with an expert immediately!

Not Swimming Properly

This is a good indication that your fish is not feeling well. Fish have a certain way of swimming and moving their fins, but if there are changes in their movements, it could be a sign of disease.

Leaking of Slime Coat

A fish with a healthy slime coat typically has a cloudy film on the water’s surface. If you notice this clouding, your pet may suffer from illness and should be taken to a vet for diagnosis.

A fish’s slime coat is an important part of its immune system, protecting them from infection and disease. If your fish has a leaky or missing slime coat, it can indicate that they are sick and need medical attention.

Unusual Behavior Of Your Fish

As a pet owner, you should know that your fish will display unusual behavior if sick. This may include lethargy and not eating. In addition to this, they tend to swim erratically as well. If you notice any of these signs, it is time to take action immediately, as this could lead to major health issues if left untreated.


If you notice any of the signs we’ve listed above, it’s time to take a closer look at your fish. Remember that these are just general symptoms. Many illnesses can affect your pet fish. Be sure to consult with an expert who can help identify what kind of illness your pet has and find out what treatment options exist for recovery.