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Finrot: My Fish Has Ragged Fins: What Is Finrot?

January 29, 2018 DrErikJohnson

Fin rot is nearly always a sign of stress and the most important step is to try and determine why the fish is stressed and..

Fish Help Questions / Lesions / Symptoms

Koi Patters and Colors Can Move, Change, Fade and Deepen

Color Changes: Why Does My Fish Change Color?

January 29, 2018 DrErikJohnson

A fairly common situation arises when fish literally change colour, either all over or just parts of the body. The most common situation is when..

Fish Help Questions / Lesions / Symptoms

Flipover: What to do About Flipover Swimbladder Disease

January 29, 2018January 29, 2018 DrErikJohnson

My fish is upside-down/ can't swim [caption id="attachment_423" align="alignleft" width="233"] Flipover Goldfish Before Surgery[/caption] This is a common problem whereby fish lose their equilibrium and..

Fish Help Questions / Lesions / Symptoms

Bloated Belly: What to Do About Dropsy?

January 29, 2018 DrErikJohnson

[caption id="attachment_418" align="alignleft" width="300"] Large Swollen Dropsy Abdomen Goldfish[/caption] This is a common but difficult problem and typifies the problems involved in fish disease diagnosis...

Fish Help Questions

Sick Fish: What Should I Do?

January 29, 2018March 25, 2023 DrErikJohnson

It is possible to make a guess - but most guesses are usually wrong. Unfortunately fish disease, as with any other animal pathology, is a..

A Health Crisis! / Fish Help Questions

The nitrification cycle of beneficial bacteria

Losses in a New Tank

January 29, 2018 DrErikJohnson

A Page on The Cycle A video on the Cycle This is caused by new pond/tank syndrome due to a build up of toxins such..

Fish Help Questions

Argulus Fish Lice of Goldfish, Koi and Aquarium Fish

Fish Lice: Argulus Parasite, How To Treat Fish Lice

January 29, 2018 DrErikJohnson

Argulus aka Fish Lice Fish Lice, or Argulus Different names for the same parasite. This is a crustacean parasite, meaning it's a lot like a..

Anti Parasite Medications / Lice and Anchorworms

Trichodina can be cleared with salt or Mardel's Clout

Trichodina: How to Treat Trichodina in Koi, Pond and Aquarium Fish

January 29, 2018 DrErikJohnson

Trichodina Trichodina is a common pathogen of Koi, goldfish and pond fish. This is a unique pathogen in several ways. First, Trichodina is problematic in..

Anti Parasite Medications / The Ciliates (Like Ich)

Ich's Life Cycle involves a cycle ON and OFF the fish

ICH: Ichthyophthirius White Spot in Koi, Pond fish and Aquaria

January 29, 2018January 29, 2018 DrErikJohnson

Freshwater Ich Written by Dr Erik Johnson Treated with Mardel Clout or Salt. Freshwater Ich - Ichthyophthirius multifilis - is a killer of very small..

Anti Parasite Medications / The Ciliates (Like Ich)

Goldfish with Hexamita. This fish won't die in all probability. Metronidazole will save it.

Hexamita: An Actual Pathogen of Koi, Tank Fish and Goldfish

January 29, 2018 DrErikJohnson

Flagellated protozoan infections: Hexamita [caption id="attachment_394" align="alignleft" width="300"] hexamita under high power microscopy[/caption] At one time, I might have denied that Hexamita could be a..

All About Parasites