water mold

noun Mycology.
any of various aquatic fungi of the phylum Oomycota, free-living or parasitic in fish and other aquatic organisms.

Origin:
1895–1900

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To water mold
Encyclopedia Britannica
Encyclopedia

water mold

any of about 150 species of fungi belonging to the order Saprolegniales (phylum Oomycota, kingdom Chromista). Many of them live in fresh or brackish water or wet soils. Most species are saprobic (i.e., they live on dead or decaying organic matter), although some cause diseases in certain fishes, higher plants, algae, protozoans, and marine invertebrates. The mycelium (filaments composing the body of the fungus) is conspicuous around bits of decaying organic matter. Reproduction is by motile, asexual spores (zoospores), which may be of two types: pear-shaped with two apical whiplike structures (flagella) or kidney-shaped with two flagella on the concave side. Zoospores are used to classify different species of water molds. In sexual reproduction, fusion of gametes (sex cells) from differentiated sex organs takes place in an oogonium.

Learn more about water mold with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
Cite This Source
Example sentences
It is a water mold which prolifically produces spores in humid and moist environments.
Efficacy trials were carried out to compare new products with industry standards for water mold control.
In winter, fish are often killed by a water mold that produces patches of gray fuzz on their skins or gills.
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature