Why Is My Fish Bleeding? What Are The Solutions?

There are a few different circumstances that could have led to the bleeding of your fish. We will put those below to answer the question, “why is my fish bleeding?“.

Additionally, this article will provide some solutions to help you resolve this problem to protect your fish’s health.

Why Is My Fish Bleeding?

Why Is My Fish Bleeding?

Do you see any blood in your fish? Because bleeding is not a typical bodily function for these organisms, you have every right to be concerned.

To determine what variables are producing the bleeding, you need to consider some aspects, one of which is the location of the bleeding.

It would be beneficial to seek other symptoms, such as fatigue and lack of appetite, as they will allow you to narrow down your huge list of illnesses and infections to a limited number of alternatives. If you choose to take your fish to a veterinarian, they will most likely determine the following as probable causes:

Strong Ammonia Content

Ammonia poisoning is a major issue in aquariums. It damages the gills, making it difficult for your fish to breathe.

If your container is overflowing with ammonia, the gills can appear bleeding. Other symptoms include difficulty breathing, tiredness, and appetite loss. The fish will develop bleeding areas over its body if the ammonia poisoning continues.

These patches may also be seen on the fins. In the worst-case situation, the bleeding that began on the outside will continue on the inside. Your fish, under such circumstances, may finally perish.

Ammonia surges also impact pH, which is critical for the fish’s health. The incorrect pH is more than just a nuisance for your fish. If left untreated, it may have devastating effects on their health, including bleeding gills.

Injured Fish

This must be your top priority when considering the reason for your fish’s bleeding. Injuries often occur in aquariums. A hyperactive fish may clash with the sharp items in the aquarium, resulting in unsightly bruises and rips. It may also come into contact with aggressive tankmates, which may assault it, resulting in bleeding injuries.

Physical injuries or accidents with hard objects are generally straightforward to diagnose since they do not resemble ulcers and lacerations produced by infections. Furthermore, the bleeding is probably to be localized.

Your Fish Is Infected With Parasitic Diseases

Parasites are tiny. However, unlike bacteria, they are big enough to be seen under a microscope. They are also accountable for a slew of conditions that may result in bleeding, the most frequent of which is:

  • Ich is a condition that causes white spots to form all over your fish’s body. How does this result in bleeding? The fish are bothered by it. It will try to relieve its pain by pushing against the tank’s items.
  • Anchor Worms are parasites that burrow into the stomach of fish. This might result in bleeding at the location where the worms have pierced the fish. Manually removing the worm will result in additional bleeding.
  • Velvet – Amyloodinium Ocellatum causes velvet, which has a yellow or light brown coloring that appears like a rust layer on the skin. Velvet, like ich, causes fish to scrape at hard surfaces. This might result in bleeding injuries.

It is also worth mentioning that velvet causes irritation and bleeding in the gills. Lethargy and difficulty breathing are other symptoms. When this is the case, your fish will most likely swim in the tank’s higher regions, with more oxygen.

Infection by Bacteria Swept Through the Fish

There are several bacterial illnesses to be worried about when it comes to bleeding. Watch carefully for the following:

  • Fin Rot – Several bacteria, notably Pseudomonas Fluorescens, have been linked to fin rot. Many aquarists blame the ailment on the poor tank environment and stress. Fin rot discolors fins, causing them to shred and finally fall off. Fish may generate bloody spots in the afflicted area.
  • Dropsy – Many people do not identify Dropsy with bleeding. They are not incorrect. It is unlikely that a Dropsy will result in bleeding. However, in addition to destroying the fins, the illness may create red patches on your fish’s skin, which novices may mistake for blood.
  • Ulcers are exactly what they sound like: open sores that may cover the fish’s whole body. Ulcers may be caused by a multitude of factors. This includes Mycobacteriosis (which causes skin ulcers to bleed), Edwardsiellosis (which also produces skin ulcers), and Vibrio bacteria. Ulcers may form on the skin, fins, or tail. Internal organs might bleed as a result of certain disorders that are quite serious.

Hemorrhagic septicemia has developed in your fish

Piscine Novirhabdovirus, which generally infects aquatic hosts, has been linked to this condition. It is connected with open sores, injured gills, and bleeding beneath the scales, among other signs. It may eventually result in death.

How To Deal With Bleeding Of Fish

How To Deal With Bleeding Of Fish

If your fish is bleeding from the fins, gills, or beneath the skin, you must tailor their therapy to the underlying cause. Among the practical solutions are:

Ammonia Spikes Must Be Balanced

Water testing identifies ammonia surges well, and we highly recommend The API Aquarium Test Kit. The kit measures pH, ammonia, nitrates, and nitrites. If something’s awry, you’ll know in minutes.

Ammonia poisoning is treated by a partial water change. If your fish needs quick help, you may use water conditioners to neutralize ammonia within minutes, enabling you to conduct fewer water changes that cause less stress.

Find out what caused the ammonia rise. This includes inadequate hygiene (when the tank isn’t cleaned and organic stuff rots in the water) and overfeeding.

If you feed your fish too much, they’ll create more waste, raising ammonia levels when some limit feeding. They don’t want their tanks to gather waste until ammonia levels drop.

Water Replacement

Even if your ammonia levels are normal, make frequent water changes. This will avoid future toxin spikes. Water testing helps your fish.

High ammonia, nitrate, and nitrite levels may be dangerous. Their presence makes fish more susceptible to illness. After the water changes, add conditioners. They are eliminating chlorine, chloramine, and copper.

Dealing With Aquatic Diseases

Determine the sickness causing your fish’s bleeding. This helps find relevant treatments for some above diseases following the advice of a veterinarian.  

Dealing With Injuries

Keep hard things with sharp edges out of the tank to prevent your fish from inadvertently cutting themselves. It is advisable to keep the animals with tank mates that will not harm them, such as Zebra Danios and Platies.

If your fish has already been harmed, medications such as erythromycin and minocycline may be used to prevent infections. Epsom Salt is used by certain aquarists. Pour four tablespoons of salt per gallon of water if using salt. I recommend doing this in a different tank.

Enhancing Aquarium Conditions

Maintain the right tank conditions. Purchase a testing kit to confirm that the acidity, temperatures, and hardness are correct. Keep your fish in at least 20 liters of water. They, like other fish, despise tiny, crowded aquariums. More significantly, since toxins build fast in small tanks, they need a lot of upkeep.



Why Does My Fish Have Blood On Its Tail?

Bloody streaks or crimson patches in the tail or fins: This is a solid symptom of a significant water issue. High levels of ammonia or nitrites may induce blood bleeding (broken blood vessels) in the veins of the fish’s tail, resulting in thin red lines or patches of blood in the fins.

What Color Is Fish Blood?

Fish blood seems colorless to us, yet it is nearly identical to the blood in our veins. Under that microscope, you can observe that a fish’s blood contains both red and white cells, exactly like human blood.

Will A Fish Survive If It’s Bleeding?

Although the fish is bleeding, releasing it back into the water increases its chances of survival. Even if it does not survive, the fish will most likely be consumed by another species of fish or animals.


Here you have the answer to the inquiry, “why is my fish bleeding?“. When your fish bleeds, check the water. The most important ingredient is ammonia. 

If the parameters are right, direct collisions may produce it. You should remove sharp things that may cut the fish. Additionally, a veterinarian can rule out an infection and, to avoid spread, separate the bleeding fish.