- Channel darter
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Channel darter Scientific classification Kingdom: Animalia Phylum: Chordata Class: Actinopterygii Order: Perciformes Family: Percidae Subfamily: Etheostomatinae Genus: Percina Species: P. copelandi Binomial name Percina copelandi
(Jordan, 1877)The Channel Darter (Percina copelandi) is a member of the Perch family, Percidae, and subfamily Etheostomatinae. This species is listed as Threatened by the Canadian Species at Risk Act (SARA). It has the following characteristics and distinguishing features:
- A small-sized fish between 34 and 61 mm in total length; some specimens as large as 72 mm
- Light sand or olive in colour with brown speckles on its back
- A dark spot or bar may be present below the eye and extending onto the snout 8 to 18 brown oblong blotches along the lateral line linked by a thin brown line
- Fins are clear or lightly speckled
- The first spiny dorsal fin usually has 11 rays
- Spawning males become dusky with a blackish head
Contents
Distribution
The distribution of the Channel Darter in North America is highly localized. In Canada, its occurrence is uncommon, but disjunct populations can be found in Ontario and Quebec. In Ontario, it is found in Little Rideau Creek, in tributaries of the Bay of Quinte, and in lakes Erie and St. Clair. Along the Huron-Erie corridor, they have been collected from the St. Clair and Detroit rivers. In Quebec, it occurs in some tributaries of the St. Lawrence and Ottawa rivers. In the United States, the Channel Darter occurs widely, but disjunctly, in the Ohio and lower Mississippi basins. Oh pop
Habitat and Life History
Channel Darters prefer pools and riffles of small- to medium-sized rivers, but have also been found in shallow, slow current areas of large rivers. Substrate preferences include sand, gravel or rock. This fish has also been found in lakes along sand and gravel beaches where wave action is gentle and the current slow. Communal spawning occurs in the spring and early summer in upstream areas with moderate to fast current and over fine gravel or small rocks. Males establish breeding territories. Females spawn with successive males and lay 4 to 10 eggs in each nest; 350 to 700 eggs in total. There is no parental care.
Diet
Channel Darters are benthic feeders, consuming insects that live on the stream or river bottom such as mayfly and midge larvae. They also eat algae and detritus.
Threats
This fish is threatened by habitat loss due to sedimentation (agricultural and urban development) and deteriorating water quality. In addition, activities which impede or slow water flow during spawning are a threat to the survival of this species. The introduced Round Goby (Neogobius melanostomus) may also compete with the Channel Darter for space and resources and is a potential predator of eggs.
Similar Species
The Channel Darter most resembles the River Darter (Percina shumardi). In addition, it can be distinguished from the Johnny Darter (Etheostoma nigrum) and the Tesselated Darter (E. olmstedi), which have only one anal spine instead of two. It differs from the Blackside Darter (P. maculata) in usually having 11 rays on the first spiny dorsal fin instead of 13 to 14.
Text Sources
Scott and Crossman 1998; Phelps and Francis 2002 (COSEWIC Status Report). Department of Fisheries and Oceans Canada, DFO/2005-860, Cat. No. Fs22-4/40-2005E-PDF ISBN 0-662-41520-5 DFO. 2010. Recovery potential assessment of Channel Darter (Percina copelandi) in Canada. DFO Can. Sci. Advis. Sec. Sci. Advis. Rep. 2010/058.
For more information, visit the SARA Registry Website at www.SARAregistry.gc.ca. [1]
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