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Way More Than You Ever Wanted To Know About Ich | |||
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by Doug Thamm, dthamm@dolphin.upenn.edu,
29 Oct 1994 "Ich", or "White spot disease", is a primarily cutaneous infection of freshwater fish caused by the protozoal parasite Ichthyophthirius multifilis. Ich most often causes the appearance of small white spots over the body and fins of fish. However, it is important to note that ich can present with many different appearances, and that other things besides ich can cause small white spots on the body. Thus, the only sure-fire way to know that what you're treating is ich is to scrape the skin of your affected fish and look at the scraping under the microscope. For those of you interested in looking at things under the microscope, Ichthyophthirius is a large ciliated protozoan with a U-shaped macronucleus. Its shape changes as it moves through the water, and it appears to "tumble" as it moves. (You can mail me for more detailed instructions on skin scrapings etc. if interested.) For those of you not interested in skin scrapings, you can have a high rate of success just assuming that what you're treating is ich. To effectively treat ich, it's important to understand a little bit about the life cycle of the organism. -------> ADULT (on fish) ------- | | | | | | ** TOMITE ** TROPHOZOITE | | | | | | ------------- CYST --------------The adult stage lives on the skin and body of the fish. It will burrow under the epidermis, causing skin damage. Disruption of the skin leads to osmoregulatory disturbances, osmotic stress, and allows for the easy entrance of secondary invaders like bacteria. The cyst stage lives on the bottom of the aquarium, and gives rise to about 300 tomites per cyst. The tomite stage is the only stage which is sensitive to medication! The life cycle takes 12-16 days to complete, depending on the temperature, and the tomite stage lasts for only three days. All of these facts may seem trivial, but they are important because they dictate what treatments will be effective.
How To Treat Ich (The Important Stuff)
Please note: This is intended for people of all different backgrounds and levels of experience. Please don't be put off if some of this information seems too basic, or if some of this information seems unnecessary or superfluous. I hope you find some of this information useful! Good luck! -Doug DISCLAIMER: I am speaking for nobody but myself in writing this: The University of Pennsylvania School of Veterinary Medicine has nothing to do with my dissemination of this information, so please don't sue them (or me, for that matter) if you still have trouble treating ich after reading this.
----------------------------------------------------------------- | A student asked his master, "Master, what is the Way?" | | The master slapped the student, and the student went away | | enlightened. | ----------------------------------------------------------------- | Douglas H. Thamm | University of Pennsylvania | | dthamm@dolphin.upenn.edu | School of Veterinary Medicine | ----------------------------------------------------------------- |
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