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Why did my black Moor goldfish suddenly lose its tail and fin?

Updated On September 23rd, 2025

Pet's info: Fish | Bottom Feeder

My black Moors tail was fine last night and this morning. Got home from work this evening and his whole tail is gone and top fin as well.

1 Answer

Most Helpful Answer

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Answered By Todd Cecil

Veterinarian

Published on May 26th, 2019

Thanks for reaching out about Lucky. First, check water quality for pH, ammonia, nitrites and nitrates. Correct any problems. Is there any other fish in the tank that could be aggressive? Bacterial infections can attack the fins/skin, and if the lesions progress, a veterinary visit is recommended to assess Lucky's health and work on a diagnostic/treatment plan. Any new fish might have introduced parasites. Good luck.

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