Toxicity of CuSO{sub 4} and Cutrine to fish under continuous and episodic exposure from agricultural use to control algae
- Colorado Div. of Wildlife, Fort Collins, CO (United States)
A series of toxicity tests were performed to investigate possible impacts of repeated application of copper sulfate and/or cutrine to control algae in irrigation canals. Rainbow trout (Oncorhynchus mykiss) were exposed to copper sulfate and Cutrine, a commercially available algicide using chelated copper ion, under continuous and episodic exposure in very soft, low alkaline, water of 10 mg/liter which is characteristic of the Big Thompson River in Colorado. The most important factor controlling short-term toxicity of copper in soft water is duration of exposure. Rainbow trout exposed to 40 mg Cu/liter as CUSO, for 30, 45 and 60 minutes resulted in 100% mortality after 110, 5.6, and 1.3 hours, respectively. Exposure of copper sulfate for 30 minutes resulted in a 96-hr LC50 of 25.8 mg Cu/liter compared to 1.93 mg Cu/liter for Cutrine following the recommended 3 hour exposure period. Repeated episodic exposure of rainbow trout to copper sulfate and Cutrine resulted in increased mortality through six, weekly episodic events. Effect/no effect concentrations for weekly exposure to copper sulfate for 30 minutes for eighteen weeks were 2.14 and 1.03 mg Cu/liter, giving a chronic value of 1.48 mg/liter. The effect/no effect concentrations for weekly exposure episodes of 3 hours to Cutrine were 0.26 and (an estimated) 0.1 mg/liter for a chronic value of 0.16 mg Cu/liter. Ninety-six hour LC50s from continuous exposure of rainbow trout to copper sulfate and Cutrine were 4.92 and 7.20 /{micro}g Cu/liter, respectively. Chronic values for rainbow trout continuously exposed to copper sulfate and Cutrine were 1.77 and 2.47 {micro}g Cu/liter, respectively. Recommended use and application of copper sulfate and Cutrine where fish reside are also discussed.
- OSTI ID:
- 392359
- Report Number(s):
- CONF-9511137-; ISBN 1-880611-03-1; TRN: IM9647%%213
- Resource Relation:
- Conference: 2. Society of Environmental Toxicology and Chemistry (SETAC) world conference, Vancouver (Canada), 5-9 Nov 1995; Other Information: PBD: 1995; Related Information: Is Part Of Second SETAC world congress (16. annual meeting): Abstract book. Global environmental protection: Science, politics, and common sense; PB: 378 p.
- Country of Publication:
- United States
- Language:
- English
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