Overview

Comprehensive Description

Biology

Inhabit cool streams. Feeds on aquatic insects (Ref. 54729). Survives well in aquarium conditions and the pink lateral band of mature males make them attractive for native fish aquaria (Ref. 54726).
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Distribution

occurs (regularly, as a native taxon) in multiple nations

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National Distribution

Canada

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

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Global Range: Range encompasses the upper Mississippi, Ohio, and Great Lakes drainages, from south-central Canada to northern Alabama and Georgia and east to eastern Lake Erie.

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Range Description

Range encompasses the upper Mississippi, Ohio, and Great Lakes drainages, from south-central Canada to northern Alabama and Georgia and east to eastern Lake Erie.
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North America: primarily in upper Mississippi and Ohio drainages, U.S.A and Manitoba, Canada.
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Eastern and central U.S.A.
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Physical Description

Size

Max. size

8.0 cm NG (male/unsexed; (Ref. 54729))
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Type Information

Syntype for Rhinichthys meleagris
Catalog Number: USNM 120291
Collection: Smithsonian Institution, National Museum of Natural History, Department of Vertebrate Zoology, Division of Fishes
Collector(s): D. Rauch
Year Collected: 1854
Locality: Burlington, Iowa, Des Moines County, Iowa, United States, North America
  • Syntype:
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Ecology

Habitat

Habitat Type: Freshwater

Comments: Habitat includes rocky runs and pools of headwaters, creeks, and small rivers (Page and Burr 2011).

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Habitat and Ecology

Habitat and Ecology
Habitat includes rocky runs and pools of headwaters, creeks, and small rivers (Page and Burr 2011).

Systems
  • Freshwater
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Environment

pelagic; freshwater; depth range 2 - 5 m (Ref. 54726)
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Migration

Non-Migrant: No. All populations of this species make significant seasonal migrations.

Locally Migrant: No. No populations of this species make local extended movements (generally less than 200 km) at particular times of the year (e.g., to breeding or wintering grounds, to hibernation sites).

Locally Migrant: No. No populations of this species make annual migrations of over 200 km.

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Trophic Strategy

Prefers current: may be associated with lower water velocities but mostly moderately fast channel habitats (15-50 cm/sec), 2.5-5 meter depth, gravel to rubble substrate in Manitoba Escarpment streams, Less common in large rivers and along the shorelines of lakes; on sand, and in water usually less than 1 meter deep. A benthic-feeding predator of aquatic insect larvae; plant material may comprise up to 25% of the diet, fish eggs are taken as well (Ref. 54726).
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Conservation

Conservation Status

National NatureServe Conservation Status

Canada

Rounded National Status Rank: N5 - Secure

United States

Rounded National Status Rank: N5 - Secure

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

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IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2013

Assessor/s
NatureServe

Reviewer/s
Smith, K. & Darwall, W.R.T.

Contributor/s

Justification
Listed as Least Concern in view of the large extent of occurrence, large number of subpopulations, large population size, and lack of major threats. Trend over the past 10 years or three generations is uncertain but likely relatively stable, or the species may be declining but not fast enough to qualify for any of the threatened categories under Criterion A (reduction in population size).
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Population

Population
This species is represented by a large number of subpopulations and locations.

Total adult population size is unknown but relatively large.

Trend over the past 10 years or three generations is uncertain but likely relatively stable or slowly declining.

Population Trend
Stable
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Threats

Comments: Localized threats may exist, but on a range-wide scale no major threats are known.

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Major Threats
Localized threats may exist, but on a range-wide scale no major threats are known.
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Not Evaluated
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Management

Conservation Actions

Conservation Actions
Currently, this species is of relatively low conservation concern and does not require significant additional protection or major management, monitoring, or research action.
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Wikipedia

Western blacknose dace

Western blacknose dace (Rhinichthys obtusus) is a species of ray-finned fish in the genus Rhinichthys.

References

  1. ^ Froese, Rainer, and Daniel Pauly, eds. (2006). "Sinibrama obtusus" in FishBase. April 2006 version.


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Names and Taxonomy

Taxonomy

Comments: On advice of R. E. Jenkins, Nelson et al. (2004) split the blacknose dace into two species, R. atratulus (eastern blacknose dace, primarily in Atlantic Slope drainages) and R. obtusus (western blacknose dace, remainder of range).

Not all ichthyologists accept this split but prefer to maintain atratulus and obtusus as conspecific (e.g., Page and Burr 2011). Based on morphological data for populations in Canada, Fraser et al. (2005) could not distinguish the western and eastern species. In contrast, Smith (2007) readily distinguished the two in West Virginia, based on morphology and molecular analysis of the mitochondrial cytochrome b gene.

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