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Clark County, Nevada

Information provided for informational purposes only

Note: This information is provided for reference purposes only. Although the information provided here was accurate and current when first created, it is now outdated.

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Pesticide Table | About the Virgin River Chub | About the Woundfin
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Clark County, Nevada

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Virgin River Chub

Woundfin

Table of Pesticide Active Ingredients

Active Ingredient Code *TAR
ATRAZINE (granular) 3C --
ATRAZINE (non-granular) 397 1.8
AZINPHOS-METHYL 3C --
BENOMYL 3C --
CAPTAN 3C --
CARBARYL 3C --
CARBOFURAN 1 --
CHLOROTHALONIL 1 --
CHLORPYRIFOS   
Alfalfa, Peanuts
43 --
Apples
41 --
Mosquito Larvicide Use
61 --
All Other Uses
3C --
COOPPER SULFATE, BASIC 1 --
DIAZINON 3C --
DICOFOL 3C --
DISULFOTON 3C --
ENDOSULFAN 3C --
ESFENVALERATE 3C --
ETHION 3C --
ETHOPROP -- --
Brussels Sprouts, Grapes
1 --
FLURIDONE 20 --
FONOFOS 3c --
ISOFENPHOS (granular) 3C --
ISOFENPHOS (non-granular) 397 .5
MALATHION 5 --
MANCOZEB 1 --
METHIDATHION 3C --
METHOMYL 1 --
METHOPRENE 3C --
METHYL PARATHION 3C --
MEVINPHOS 3C --
NALED 3C --
OXYDEMETON-METHYL 3C --
OXYFLUORFEN 1 --
PARATHION (ethyl) 3C --
PERMETHRIN 3C --
PHORATE 3C --
PHOSMET 3C --
PROPARGITE 3C --
PYRETHRINS 3C --
TERBUFOS 3C --
THIODICARB 1 --
THIOPHANATE-METHYL 1 --
TRICHLORFON 3C --

*TAR = Threshold Application Rate (Pounds of Active Ingredient per acre per application )

Code Limitations
1 Do not apply this pesticide within 20 yards of the edge of water within the shaded area for ground applications, nor within 100 yards for aerial aplications.
3C For ground applications, do not apply this pesticide within 100 yards from the edge of water within either the shaded area or the upstream protection zone (described under the Shading Key). For aerial applications, do not apply this pesticide within 1/4 mile from the edge of water within the areas described above.
5 Do not apply ultra low volume (ULV) applications within 1 mile of the edge of water within the shaded area. In addition, do not apply within 1 mile upstream of the shaded area.
20 Do not apply directly to water within the shaded area.
41 Do not apply this pesticide within 1/4 mile of the edge of water within the shaded area for ground applications , nor within 1/2 mile for aerial applications.
43 Do not apply this pesticide within 100 yards of the edge of water within the shaded area for ground applications , nor within 1/4 mile for aerial applications.
61 Do not apply this pesticide as a mosquito larvicide within the shaded area.
397 For ground applications, do not apply this pesticide above the threshold application rate (TAR) indicated within 100 yards from the edge of water within either the shaded area or the upstream protection zone (described under the Shading Key). For aerial applications, do not apply this pesticide within 1/4 mile from the edge of water within the areas described above.
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Virgin River chub [Gila robusta seminuda]

The Virgin River chub is a medium-sized minnow that averages about 8 inches in total length but can grow to a length of 18 inches. It has a silvery, elongated body with a narrow tail and 9 to 10 rays on the dorsal, anal, and pelvic fins. Scales are small and difficult to see. It is an omnivorous fish, feeding on algae, aquatic and terrestrial insects, crustaceans, and organic detritus.

This species is endemic to 134 miles of the Virgin River in southwest Utah, northwest Arizona, and southeast Nevada. The Virgin River Chub presently occurs in only 50 miles of the mainstream Virgin River between Mesquite, Clark County, Nevada, and La Verkin Creek near Hurricane, Washington County, Utah. It is most common in deeper areas where waters are swift with boulders and other sorts of cover. It occurs over sand and gravel substrates in water less then 90 degrees farenheit, and is very tolerant of high salinity and turbidity.

Studies indicate that a large decrease in range and numbers of this species has occurred in the last century, primarily due to water diversions and construction of Hoover Dam and Lake Mead. The potential for additional irrigation projects continues to threaten the existence of this species along with threats from the non-native red shiner and deterioration of water quality from agricultural runoff. The Virgin River Fishes Recovery Team of the Fish and Wildlife service is currently planning recovery for this species and the Woundfin, another federally Endangered fish found in the area.

Moseley, C.J.. (ed.), The Official World Wildlife Fund Guide to Endangered Species Vol.III, Beacham Publishing Inc, Washington, DC. pp. 1411-1412.
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Woundfin [Plagopterus argentissimus]

The woundfin is a streamlined, silvery minnow about 3 inches in length. It has leathery skin, without scales, and has sensors on its lips. It feeds on algae, detritus, seeds, insects, and larvae and is commonly found in shallow, swift flowing water over sand or gravel bottoms or in adjacent pools. The reproductive cycle of this fish is believed to be triggered by lengthening daylight, increasing temperature, and declining spring runoff in late May.

Historically, the woundfin's range was in the Colorado and Gila river basins in Arizona, Nevada, and Utah. The woundfin now occurs only in the Virgin River. The range extends 36 miles in Utah downstream from the mouth of LaVerkin Creek, 35 miles through the northwest corner of Arizona, and then 12 miles in Nevada down to Lake Mead. There are no population estimates.

Dams, canals, reservoirs, and other water diversions for irrigation and municipal uses have eliminated much of the woundfin habitat. The red shiner, a non-native fish, continues to threaten woundfin populations despite efforts to eliminate them from the Virgin River. Local authorities have also tried to transplant the woundfin into a number of rivers and creeks but reproduction at these sites has not been successful.

Matthews, J.R. (ed.), The Official World Wildlife Fund Guide to Endangered Species Vol.II, Beacham Publishing Inc, Washington, DC. pp. 926-927.

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