The robust redhorse (''Moxostoma robustum'') is a

redhorse ''Moxostoma'', the redhorses or jumprocks, is a genus of North American ray-finned fish in the family Catostomidae. Redhorses are variable in size, geographic location, and other ecological traits such as spawning substrate. Several redhorses ar ...

-type fish that lives in the

freshwater Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. The term excludes seawater and brackish water, but it does include non-salty mi ...

streams of the eastern United States. It was previously called the smallfin redhorse.

Taxonomy

Using a specimen from the

Yadkin River The Yadkin River is one of the longest rivers in the US state of North Carolina, flowing . It rises in the northwestern portion of the state near the Blue Ridge Parkway, Blue Ridge Parkway's Thunder Hill Overlook. Several parts of the river a ...

of North Carolina,

naturalist Natural history is a domain of inquiry involving organisms, including animals, fungi, and plants, in their natural environment, leaning more towards observational than experimental methods of study. A person who studies natural history is cal ...

Edward Drinker Cope Edward Drinker Cope (July 28, 1840 – April 12, 1897) was an American zoologist, paleontology, paleontologist, comparative anatomy, comparative anatomist, herpetology, herpetologist, and ichthyology, ichthyologist. Born to a wealthy Quaker fam ...

first described the robust redhorse as ''Ptychostomus robustus'' in 1870. The original specimen was lost or destroyed, and by the late 19th century, all mention of the robust redhorse had ceased. It was thought to be

extinct Extinction is the termination of an organism by the death of its Endling, last member. A taxon may become Functional extinction, functionally extinct before the death of its last member if it loses the capacity to Reproduction, reproduce and ...

until several unidentified fish specimens were collected from the

Savannah River The Savannah River is a major river in the Southeastern United States, forming most of the border between the states of Georgia (U.S. state), Georgia and South Carolina. The river flows from the Appalachian Mountains to the Atlantic Ocean, ...

and

Pee Dee River The Pee Dee River, also known as the Great Pee Dee River, is a river in the Carolinas of the United States. It originates in the Appalachian Mountains in North Carolina, where its upper course, above the mouth of the Uwharrie River, is known a ...

in 1980 and 1985. In August 1991,

biologists A biologist is a scientist who conducts research in biology. Biologists are interested in studying life on Earth, whether it is an individual cell, a multicellular organism, or a community of interacting populations. They usually specialize in ...

with the

Georgia Department of Natural Resources The Georgia Department of Natural Resources (DNR) is an administrative agency of the U.S. state of Georgia. Structure The agency has statewide responsibilities for managing and conserving Georgia’s natural, cultural, and historical resource ...

officially rediscovered the species when five specimens of the fish were collected in the

Oconee River The Oconee River is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map Accessed April 21, 2011 river in the U.S. state of Georgia. Its origin is in Hall County and it terminates where it join ...

, and identified as robust redhorse. Robust redhorse FWS 1

Description

''M. robustum'' is a large, fairly long-living animal compared to other members of its

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

; the fish can weigh up to and live for up to 27 years, although it averages in length and in weight. ''M. robustums body is thick, or "robust", its fins are rose-colored, and it has a fleshy

lower lip The lips are a horizontal pair of soft appendages attached to the jaws and are the most visible part of the mouth of many animals, including humans. Mammal lips are soft, movable and serve to facilitate the ingestion of food (e.g. sucklin ...

Distribution and habitat

''M. robustum'' is found in the eastern United States from the

Cape Fear River The Cape Fear River is a blackwater river in east-central North Carolina. It flows into the Atlantic Ocean near Cape Fear, from which it takes its name. The river is formed at the confluence of the Haw River and the Deep River in the town of ...

drainage Drainage is the natural or artificial removal of a surface's water and sub-surface water from an area with excess water. The internal drainage of most agricultural soils can prevent severe waterlogging (anaerobic conditions that harm root gro ...

North Carolina North Carolina ( ) is a U.S. state, state in the Southeastern United States, Southeastern region of the United States. It is bordered by Virginia to the north, the Atlantic Ocean to the east, South Carolina to the south, Georgia (U.S. stat ...

's Peedee River drainage, south to the

system, part of Georgia's

Altamaha River The Altamaha River is a major river in the U.S. state of Georgia (U.S. state), Georgia. It flows generally eastward for from its Source (river or stream), origin at the confluence of the Oconee River and Ocmulgee River towards the Atlantic Oce ...

drainage. They live in both rocky and

silt Silt is granular material of a size between sand and clay and composed mostly of broken grains of quartz. Silt may occur as a soil (often mixed with sand or clay) or as sediment mixed in suspension (chemistry), suspension with water. Silt usually ...

y pools or less turbulent areas of small and medium rivers, and are also found in

reservoir A reservoir (; ) is an enlarged lake behind a dam, usually built to water storage, store fresh water, often doubling for hydroelectric power generation. Reservoirs are created by controlling a watercourse that drains an existing body of wa ...

s and other water impoundments.

References

{{Taxonbar, from=Q3763241 Moxostoma Fish of North America Fish described in 1870 Taxa named by Edward Drinker Cope