mudfish

from The Century Dictionary.

• noun A fish which lives or burrows in the mud. Specifically — A dipnoan fish, Protopterus annectens, of the family Lepidosirenidæ.
• noun The Australian Ceratodus forsteri.
• noun The North American bowfin, Amiacalva. Also called marsh fish.
• noun Some or any species of the genus Umbra or family Umbridæ. Also called mud-minnow.
• noun A former Anglo-American name in New York of a killifish.
• noun A gobiine fish, Gillichthys mirabilis, remarkable for the great extension backward of the maxillary bones. It attains a length of 6 inches, and burrows in the mud between tide-marks, so that its burrow is exposed at low tide. It abounds along the coast of California.
• noun A New Zealand fish of the family Galaxiidæ; the Neochanna apoda. P. L. Sclater. (See cuts under Amiidæ, Lepidosiren, Umbra, and Gillichthys.)

from the GNU version of the Collaborative International Dictionary of English.

• noun The European loach.
• noun The bowfin (Amia calva).
• noun The South American lipedosiren, and the allied African species (Protopterus annectens). See lipedosiren.
• noun The mud minnow, a fish of the genus Umbra or family Umbridae.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Any of many different species of fishes, such as Neochanna, the bowfin, or Clarias anguillaris.