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From The Aquarium Wiki

Contents 1 What are Walterworms? 2 What are they used for in fish keeping? 3 How are “Walter Worms” different from “Micro Worms”? 4 References:

[edit] What are Walterworms?

Walter Worms are a type of nematode or roundworm. Walter worms are non parasitic variety of roundworm and presumably feed on yeast^[1].

[edit] What are they used for in fish keeping?

Walter Worms make excellent food for fry (up to ¼”-½” and even adults of some species take them). They can be used instead of infusoria or baby brine shrimp as a first or second food.

[edit] How are “Walter Worms” different from “Micro Worms”?

Micro Worms are slightly larger then the walters. Walter worms also live longer underwater and sink slower then Micro Worms^[2]. There is also a difference in nutritional content: Walter Worms: 59% protein, 18% lipids, 15% fat, 3% glycogen, 2% organic acids, and 3% nucleic acids Micro Worms: 48% protein, 12% lipids, 31% fat, 7% glycogen, 1% organic acids, and 1% nucleic acids^[3]

[edit] References:

1. ↑ soil-inhabiting nematodes July 1997 University of Florida
2. ↑ Microworms vs Walterworms January 2006 SLAKA
3. ↑ Culturing nematode worms: live food for tropical fish 20 August 2008. Pleco Fanatics