The redside shiner typically inhabits cold waters including ponds, lakes, pools, and backwaters of large rivers as well as small streams and shallow edges of lakes and ponds.[5] Their natural range is mostly west of the Rocky Mountains of North America with the exception of the Peace River in northern British Columbia and Alberta, extending southward through most of Washington, Oregon and Idaho, western Montana, northern Nevada, and the Bonneville Basin in Utah. The species has been introduced into northwestern Colorado, southwestern Wyoming, the upper Missouri River drainage in Montana and in reservoirs outside its native distribution in southern Utah. Some of these introductions are from illegal bait bucket transfers, likely done by well-meaning anglers to increase forage for sport fish, but not an ecologically sound decision in most cases. Being aggressive colonizers, they rapidly expand in waters that fit their ecological niche requirements.
It is broadly accepted that geological processes (river capture and lake spillover events such as the Bonneville flood) and changing climate (survival in and expansion from Pleistocene refugia) have contributed to this species current geographic distribution as described by Hubbs and Miller (1948),[3]Minckley et al (1981),[6] McPhail and Lindsey (1981).[7]
Morphology
The redside shiner has a silver coloration on its sides and a dark (olive or brown) coloration on its back. It has a thick black stripe and a smaller red/gold stripe along the lateral line. Additional red coloration is exhibited on the lower half of the anterior end of the body during spring spawning, especially in males.[8]
The fish has a deep, laterally compressed body shape, a forked homocercal tail, and a complete, decurved lateral line. Its anal fin is composed of 10-24 rays, and its dorsal fin is composed of 8-12 rays. Neither of these fins have any spines. The fish has between 52 and 67 lateral line scales, and typical specimens are between 55 and 80 millimeters in length (2.2-3.1 inches). It has a conical snout, no barbels, and a terminal mouth with pharyngeal teeth arranged as 2,4-4,2 or 2,5-5,2. Its eyes are relatively large in comparison to its body size. Meristics vary among the subspecies R. b. balteaus and R. b. hydrophlox.[9]
Life cycle
The redside shiner is a short-lived fish, maturing around age 2, living on average 5–6 years but has been recorded living up to 8 years.[10] They spawn in spring into the early summer, and their eggs are coated by a sticky adhesive that allows them to stick to rocks and vegetation.[11] Their diet includes aquatic and terrestrial invertebrates, as well as the eggs and fry of other species. They are an intraguild predator meaning that they are both predators and prey to larger species such as salmon.
^Lee; Gilbert; Hocutt; Jenkins; McAllister; Stauffer (1980). Atlas of North American Freshwater Fishes. North Carolina State Museum of Natural History: North Carolina Biological Survey.
^Minckley, Wendell; Hendrickson, Dean; Bond, Carl (1981). Geography of western North American freshwater fishes: Description and relationships to intracontinental tectonism in The Zoogeography of North American Freshwater Fishes. New York: John Wiley and Sons. pp. 519–613.
^McPhail, John; Lindsey, C.C. (1981). Zoogeography of the Freshwater Fishes of Cascadia (the Columbia System and rivers north to the Stikine) in The Zoogeography of North American Freshwater Fishes. New York: John Wiley and Sons. pp. 615–637.
^Houston, Derek; Belk, Mark (2006). "Geographic variation in somatic growth of redside shiner". Transactions of the American Fisheries Society. 135 (3): 801–810. Bibcode:2006TrAFS.135..801H. doi:10.1577/T05-082.1.
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