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What is fin rot?

Updated: 11/5/2022
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16y ago

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Fin rot is a symptom of disease in fish; it is not hard to treat, and the fish usually will survive. Most common in the fancy varieties of goldfish and Bettas, fin rot can occur as a result of an injury, as a secondary infection once the fish has been weakened by another disease, or in some cases, as a primary infection (bacterial (Pseudomonas fluorescens) ). Fin rot can be the result of a bacterial infection (which causes a more ragged rotting), or as a fungal infection (which rots the tail more evenly and is more likely to produce a white 'edge'). Sometimes, both types of infection are seen together. Infection is commonly brought on by bad water conditions, injury, poor diet, or outwintering fancy goldfish (who should live in warmer temperatures). Fin rot starts at the edge of the fins, and destroys more and more tissue until it reaches the fin base. If it does reach the fin base, the fish will never be able to regenerate the lost tissue. At this point, the disease may attack the fish's body directly. This infection can happen overnight without warning.

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Q: What is fin rot?
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Related questions

What does fin rot look like on fancy guppies?

You will usually notice a grey, torn look at the tip of the fin (it will spread as the fin rot progresses).


Will bettafix treatment cure betta fish fin rot?

Yes, bettafix can fix fin rot if the fin rot is not serious. If there is 1/2 of the original fin still left the I recommend bettafix as it is made of organic material and is very effective.


Can a parrot recover from plucking its feathers?

no it will die from fin rot


Why is a betta fish's tail fraying?

If there are long stringy pieces of fin left, it's tail biting caused by stress or boredom. Anything else, it's fin rot caused by filthy water. Way to go.


What are some diseases for bettas?

Ich, Fin rot, velvet, cottony,


What can whitish splotches on goldfish dorsal and tail fins be?

Blotches on the dorsal fin and tail fin(s) can be the diseases fin and tail rot, easily cured with medication.


Why does a betta fish loose it color?

It probably has fin rot. Ask an employee at the petstore, get the fish some medicine. Also, if you are ever in Chelmsford, stop by Fins & Feathers Pet Store. They are the best. Tell them Erin sent you.


Do bettas tails break off?

No, but a betta can get fin rot, which can damage the fins and tail.


Why do fish fins rip up?

This can be caused by "fin nipping" between other fish or fin rot, which is caused by keeping fish in poor conditions.


Can a goldfish live without a dorsal fin?

Yes, but normally they grow back slowly. However, if fin rot has reached the base of the fin, then the goldfish would be in pain the rest of its life.


How do you prevent fin and tail rot?

Well, 1 easiest way is to change the water everyday and put alot of medicion in. If your betta has a light fin rot, you could put in about 10 or 20 drop, if your betta is in a advance fin rot, make sure you put a lot of medicion in! One other way from making a whole tank fill with deceses is to remove all the fish out of the tank, change the water, and put back the fish thatis health and keep the sick one out in another bowl. If you saw the fin rot but it is already in advance, there is not much of a chance that it will be alive. Sorry!


Will a betta fish eat its own tail?

No, if your fish has ragged fins it likely has fin rot. Add some melafix to the water according to the dosing instructions on the bottle. And perform several small water changes. Bettas are very susceptible to fin rot.