Notropis ozarcanus

Ozark Shiner

FWS Focus

Overview

Characteristics
Overview

The Ozark shiner (Notropis ozarcanus) is small fish species endemic to the Ozark Plateaus Physiographic Province in northern Arkansas and southern Missouri. This midwater schooling fish species inhabits sections of large creeks and medium-sized rivers with high gradients and permanent strong flow. They are usually found just below riffles in slight to moderate current but can also be found in deep pools, over silt-free gravel, cobble or sand bottoms. Destruction and modification of habitat from construction of dams and associated reservoirs are often cited as the primary cause for decline of the Ozark shiner across its range. 

Scientific Name

Notropis ozarcanus
Common Name
Ozark Shiner
FWS Category
Fishes
Kingdom

Location in Taxonomic Tree

Identification Numbers

TSN:

Characteristics

Characteristic category

Habitat

Characteristics
Habitat

Streams in the Ozark Plateaus Physiographic Province occupy narrow, steep-sided valleys bordered in places by sheer limestone bluffs. Stream channels typically have clear, well-defined riffles and pools, and substrate consisting of gravel, cobble, pebble, boulder, sand and bedrock. This physiographic province is noted for its numerous springs, the largest of which emerge along the major streams and provide an abundant and reliable source of cool water for a considerable distance.

In Missouri, the Ozark shiner is reported to inhabit sections of clear streams with high gradients and permanent strong flow which occurs most abundantly near riffles in a slight to moderate current, over a firm, silt-free bottom. The species occasionally occurs in sections of large creeks but primarily lives in rivers. In the Black River in Missouri, biologists report the Ozark shiner from riffles with slower flowing water in association with wedgespot and carmine shiners. Ozark shiners are also reported from the headwater and tailwater zones, transitional between pools and riffles in association with whitetail, popeye, wedgespot and carmine shiners.

In Arkansas, biologists have found the Ozark shiner in sections of large creeks and small-to-medium rivers where the water is clear and cool to cold. During a pre-impoundment study in the Beaver Lake drainage, Ozark shiners occurred in pools of upstream sections with 0.95 to 3.79 meters per kilometer (5 to 20 feet per mile) gradient, whereas it was rare in downstream sections where gradients were less than 0.95 meters per kilometer (5 feet per mile). However, Ozark shiners were not found it in smaller tributaries of the White River. Other studies reported the Ozark shiner in deep pools, with some occurring over sand and gravel bottoms. Biologists conducting surveys during the 1970s in Jane’s and Piney creeks, in Arkansas, reported collecting the Ozark shiner only from pool areas. Others have reported this shiner inhabits sections of medium-to-large, clean streams with high gradient and permanent, strong flow; most common near riffles in slight to moderate current over firm, silt-free bottom. The Ozark shiner as a midwater schooling fish species, which prefers high-gradient stream sections of clear, upland medium streams to large rivers, usually occur just below riffles in slight-to-moderate current over gravel, cobble or sand bottoms. It can be found in deep, flowing pools or runs in the mainstem of the Spring River, in Arkansas, but also near the confluences of Myatt and Janes creeks. Larger river segments, like the Spring River mainstem, appear to support the greatest abundance of the Ozark shiner.

River or Stream

A natural body of running water.

Characteristic category

Physical Characteristics

Characteristics
Size & Shape

The Ozark shiner is a small, slender fish. Length of adults commonly 45.7 to 63.5 millimeters (1.8 to 2.5 inches) to a maximum of 71.1 millimeters (2.8 inches).  

Color & Pattern

Coloration of the dorsum is pale yellow, sides are silver with a dusky stripe that fades out toward head, and belly is silvery-white. The dorsal fin has a small dusky blotch near the base on the first two to three rays; all other fin membranes are often dusted with fine dark speckles in adults.

Characteristic category

Life Cycle

Characteristics
Life Cycle

Limited life history information exists for many species belonging to the family Leuciscidae in North America due to difficulty in identification caused by their small size and little economic or cultural value. However, it is known that all members of this family lay eggs, and most do not guard them. 

Life Span

There are no known estimates of survival nor growth for the Ozark shiner. However, its sister species, the mirror shiner, has a maximum life span of four years and was estimated to grow 1.05 millimeters a month (0.04 inches) in North Carolina streams. 

Characteristic category

Similar Species

Characteristics
Similar Species

In a sequence analysis of the mitochondrial cytochrome b gene, the Ozark shiner was discovered as sister to a clade composed of the ghost shiner (Notropis buchanani) and mimic shiner (Notropis volucellus).

The channel shiner (Notropis wickliffi), sawfin shiners (Notropis species), mirror shiner (Notropis spectrunculus), tennessee shiner (Notropis leuciodus) and silverband shiner (Notropis shumardi) also have been included within this species complex, of which the closest related species to the Ozark shiner is the mirror shiner.

Geography

Characteristics
Range

The Ozark shiner is endemic to the Ozark Plateaus Physiographic Province in northern Arkansas and southern Missouri. The species occurs in the White and Black River drainages in northern Arkansas and southern Missouri and the St. Francis River drainage in southeastern Missouri. Biologists have collected the Ozark shiner along 53 streams and rivers throughout these drainages; most of the collections are from mainstem rivers in these drainages or near the confluence of the mainstems and a tributary.

The Ozark shiner’s distribution is localized across its range. The species is both locally common and frequently absent from apparently favorable localities, making a species that is difficult to determine true abundance. A complicating factor is the species is often in or right up against vegetation making sampling difficult. As a species, Ozark shiner is widespread and abundant in certain drainages located in Ozark Uplands of Missouri. It is considered common in Strawberry and Buffalo rivers.

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