Theses and Dissertations

Title: Preliminary tests on control of bullfrog tadpoles by use of certain chemicals and by trapping

Name: Sheridan, John R.

Degree: MS

Chair: Dr. John Stiles Dendy

Resides: FAA Library

University: Auburn

Location: Auburn, Alabama

Date: 1954

Pages: 35

Keywords: Bullfrog Tadpoles,Chemicals,Trapping.


Tadpoles interfere with the production of bait-minnow and sport fish in hatchert ponds. Tadpoles of the common bullfrog Rana catesbeiana (Shaw) were placed in aquaria and treated with twenty-four different compounds to determine which were lethal. The chemical experiments were conducted at certain temperatures within the range 61íF to 82íF.Sixteen of the chemicals tested were non-toxic, or they killed less than 50 percent of the tadpoles. These chemicals were Aldrin (0.2 p.p.m. of 40 percent wetteble powder), Calcium Chloride (10.0 p.p.m.), Chlordane (0.5 p.p.m. of 50 percent wettable powder), Cresol (10.0 p.p.m.), Dalapon (10.0 p.p.m.), Dieldrin (0.2 p.p.m. of 50 percent wettable powder), diesel Fuel (2.5 to 10.0 p.p.m.), lexone (2.5 to 20.o p.p.m. of 10 percent gamma isomer), Lindane (1.0 to 16.0 p.p.m. of 25 percent gamma isomer), Malathion (0.4 p.p.m. of 25 percent wettable powder), Methoxychlor (0.2 p.p.m. of 50 percent wettable powder), Parathion (0.4 p.p.m. of 15 percent wettable powder), Sodium Arsenite Solution (10.0 to 25.0 p.p.m. of 54.5 percent As2O3), Sodium Chloride (10.o p.p.m.), and Toxaphene (0.04 to 0.32 p.p.m. of 40 percent wettable powder). Chemical that were insufficiently tested to provide positive results were Acriflavine (0.1 to 5.0 p.p.m.), Formalin (3.12 to 100.0 p.p.m.), Malachite Green (1.0 and 2.0 p.p.m.), Postassium Permanganate (1.0 to 8.0 p.p.m.), RADA (0.25 to 8.0 p.p.m. of 50 percent liquid), and Norfish, a 5 percent emulsifiable rotenone, (1.0 to 10.0 p.p.m.). Copper sulfate killed all tadpoles in concentrations ranging from 1,0 to 2,0 p.p.m. at temperatures of 62íF, 72íF, and 82íF. THe time for a complete kill ranged from 24 hours at 2.0 p.p.m. (82íF) to 139 hours at 1.0 p.p.m. (62íF). Median tolerance limits were obtained for various time intervals at these temperatures. As the temperature increased the time required for 100 percent mortality to occur decreased. A 1.2 acres pond was trapped with three baited minnow traps for 38 days. The total catch of approximatelt 11,045 tadpoles weighed 152 pounds.

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