7870

• UCREFRP Catalog Number: 7870
• Author: Lentsch, L. D., et al.
• Title: Options For Selective Control Of Nonnative Fishes In The Upper Colorado River Basin - Final Report.
• USFW Year: 1996.
• USFW - Doc Type: \
• Copyright Material: NO

¦ Within native range, rarely becomes abundant in clear
streams with constant flow and substantial populations of
other minnows. Abundance increases when flows decrease and
abundance of other fishes is reduced [Minckley 1973].
Competition from other fishes, especially other minnows, may
be an important factor in controlling red shiner
distribution within its native range [Pflieger 1975].
¦ Possible reasons for the success of red shiner: (1) small
in size (only limited space and resources are necessary to
sustain populations); (2) occur in schools; (3) active, move
rapidly into accessible waters; (4) short lived, mature
rapidly, and produce large numbers of young; and (5)
extremely tolerant of adverse conditions [cross and Collins
1975].
¦ During dry years, red shiner may predominate in streams
having high gradients, whereas other fishes decline. In the
first year or two of a wet cycle, red shiner may continue to
be abundant and occupy nearly all available habitats. If
the wet cycle continues, red shiner may decline in abundance
until only residual numbers remain [cross 19671.
Temperature.-
¦ For fish from the South Canadian River, acclimated
at 25°C, mean critical thermal maximum (CTM) was
38.99°C (range 38.70-39.20°C); highest CTM of minnows
tested. Success of red shiner more closely related to
CTM than tolerance to low D.O. conditions [Matthews and
Maness 1979].
¦ No clinal trends in CTMs among populations of red
shiner from 18 river locations including most major
drainages within the native range of the species in the
American Great Plains (at an acclimation temperature of
21°C, CTMs ranged 35.90-36.35°C) ; CTMs among
populations unrelated to stream size [Matthews 1986].
¦ Fish from Quapaw Creek and Walnut Creek, Oklahoma,,
acclimated at 24-28°C, survived thermal shocks of +10
to -21°C (shocks of Z +12°C and -24°C were lethal) ;
survived larger negative than positive thermal shocks
[Matthews and Hill 1977].
¦ For fish from Denton Creek, Texas, acclimated at 30°C
and with access to the surface, CTMs at three D.O.
concentrations were 35.45°C (1.2 ppm, hypoxic), 39.65°C
(7 ppm, normoxic), and 39.12°C (12 ppm, hyperoxic).
Other data suggested that temperature tolerance was
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