![]() The parasite matures in the epithelium of the fish’s skin, where it is resistant to chemical treatment of the water environment. Affected fish may die from direct tissue damage by the parasite and secondary microbial infections. Its signs include the presence of small white spots resembling a sprinkle of salt grains on the body and gills, frequent scraping of the body against objects in the environment, loss of appetite, and abnormal hiding behaviour. Ich is one of the most common diseases encountered in tropical-fish aquariums. Ich, also called white spot disease, parasitic disease that affects a variety of freshwater fish species and that is caused by the ciliated protozoan Ichthyophthirius multifiliis. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.From tech to household and wellness products. Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.
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