Help. Red marks on Goldfish??

[Rfeniolo]

My goldfish developed one of these red blood looking spots near his front fin. I did a water change and a couple weeks later he has developed more of these red marks. Anyone know what they are and how/if I should treat? He is the only fish in the tank.

 

[PheonixKingZ]

Found this: https://goldfish-emergency.com/goldfish-red-blotches/

Goldfish Red Pest Disease Treatment

Red pest disease also known as pond pest, causes blood red spots or patches on the fish’s body. It is caused by a bacterial infection (bacterium cyprinicida).

www.about-goldfish.com

Actually never heard of this before.

 

[AdoraBelle Dearheart]

What are you water test results? Red marks can also indicate nitrite poisoning

 

[CassCats]

Id look at your water parameters.

Ammonia, nitrite, and nitrate especially.

But id also have to ask, any chance you used hand sanitizer or other chemical with handling the tank recently?
I have a goldie, his pond was contaminated with either toxins from a plant or maybe sanitizer, and he developed the same red sores as a reaction to the chemicals.

 

[Colin_T]

The red is blood caused by something damaging the fish. It could be a parasite like baby anchorworm, however these normally grow on the fish and appear as white worm like things hanging off the fish's body or fins.

It could be a predatory insect if the fish is kept in a pond.

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Is the fish in an aquarium or pond?
What is the ammonia, nitrite, nitrate and pH of the tank water?
What other fish are in the tank?

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Do a 75% water change and gravel clean the substrate.
Make sure any new water is free of chlorine/ chloramine before it's added to the tank.

Clean the filter if it hasn't been done in the last 2 weeks.

Add salt (see directions below).
You can add rock salt (often sold as aquarium salt), sea salt or swimming pool salt to the aquarium at the dose rate of 2 heaped tablespoon per 20 litres of water. If there is no improvement after 48 hours you can double that dose rate so there is 2 heaped tablespoons of salt per 20 litres.

If you only have livebearers (guppies, platies, swordtails, mollies), goldfish or rainbowfish in the tank you can double that dose rate, so you would add 2 heaped tablespoons per 20 litres and if there is no improvement after 48 hours, then increase it so there is a total of 4 heaped tablespoons of salt per 20 litres.

Keep the salt level like this for at least 2 weeks but no longer than 4 weeks otherwise kidney damage can occur. Kidney damage is more likely to occur in fish from soft water (tetras, Corydoras, angelfish, gouramis, loaches) that are exposed to high levels of salt for an extended period of time, and is not an issue with livebearers, rainbowfish or other salt tolerant species.

The salt will not affect the beneficial filter bacteria but the higher dose rate (4 heaped tablespoons per 20 litres) will affect some plants and some snails. The lower dose rate will not affect plants, shrimp or snails.

After you use salt and the fish have recovered, you do a 10% water change each day for a week using only fresh water that has been dechlorinated. Then do a 20% water change each day for a week. Then you can do bigger water changes after that. This dilutes the salt out of the tank slowly so it doesn't harm the fish.

If you do water changes while using salt, you need to treat the new water with salt before adding it to the tank. This will keep the salt level stable in the tank and minimise stress on the fish.