needed because cyanobacteria blooms or low dissolved oxygen does not always kill all fi sh in a pond. Application rates are based on volume of water in
the pond to be treated. Rotenone kills fi sh by inhibiting the blood’s ability to use oxygen and is more effective in warmer water be- cause fi sh metabolism is higher and dissolved oxygen levels are lower, but it also breaks down faster. Application rates range from
0.2 to 1.3 gallons per acre foot, depending on the targeted fi sh species and nutrient levels in the pond. If nutrient levels are high, if there is a lot of turbidity or sediments, or if bullheads or common carp are present, more rotenone is needed. In July 2011, the cost for 1 gallon of rotenone was $105. Rotenone is a restricted use pesticide, so a private applicator’s license is needed to use it. A boat motor prop is often used to mix rotenone in
Pond-draining methods range from slow and less expensive to faster and more expensive.
power sprayer can be used. Spray rotenone evenly across the surface. The pressure from the droplets should be enough to mix the chemical into the water column. It may also be wise to use the higher recommended rate when applying rotenone with a pres- sure sprayer. Inspect the pond at dawn to evaluate effectiveness of the treatment. Rotenone usu- ally detoxifi es in 2 to 4 weeks. For details on how to apply rote- none, see Rotenone Can Remove Undesirable Fish From a Pond,
noble.org/ag/wildlife/rotenone/. New fish should not be
the water column, but if the water level is too low for boat use (or access) without stirring up sediments, a
stocked until after rotenone detoxifi es and there is suffi cient water — usually at least 7 feet of depth, but preferably more. If the drought continues or worsens, it might be a year or longer before fi sh can be restocked. To restore a largemouth bass and bluegill fi shery, stock 500 fi ngerling bluegill per acre in the fall and 100 fi n- gerling bass per acre the following spring. If desired, channel catfi sh can be stocked at the same time as bluegill at 100 fi ngerlings per acre.
Designed for Cattlemen by Cattlemen
Quality Pearson Equipment including Chutes Alleys Tubs Tru-Test Weighing Systems
Available at these Texas locations or at
PearsonLivestockEq.com Davy
G Bar Livestock Equipment, LLC
David Rater 1463 Barry Road Henrietta, TX 76365 800-831-0567 940-507-1065
tscra.org
Morgan Livestock Equipment
Rusty Morgan Ranch Supply
137 Jerry Walker Road Bowie, Texas 76230 940-872-3093 940-841-1082
William Warwas 1397 Davy Road
Yorktown, TX 78164 361-645-4960
Available at these Texas locations or at
PearsonLivestockEq.com Davy
Ranch Supply
William Warwas 1397 Davy Road
Yorktown, TX 78164 361-645-4960
Farm & Ranch Damon Farm & Ranch Damon
Kim or Timmy 3406 CR 264 N Damon, TX 77430 979-742-3317
Kim or Timmy 3406 CR 264 N Damon, TX 77430 979-742-3317
Big Country Farm Center
Big Country Farm Center
Shane or Casey 1800 17th NE
Paris, TX 73460 903-785-8372
June 2013 The Cattleman 59
Shane or Casey 1800 17th NE
Paris, TX 73460 903-785-8372
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