Error: The download of the specified resource has failed. FRESHWATER CRAYFISH: Thermal effects on pesticide toxicity for Louisiana red swamp crawfish (<i>Procambarus clarkii</i>)
Issue Cover image

Article Metrics
logo

Freshwater Crayfish 7(1): 171-177 (1979)

PEER REVIEWED    

Thermal effects on pesticide toxicity for Louisiana red swamp crawfish (Procambarus clarkii)

Gaudé III. AP

Published Online:

Abstract

Based on field observations of unexplained mass mortalities of the Louisiana red swamp crawfish in both North American and European culture systems, laboratory studies were performed to determine the effect of water temperature on pesticide toxicity. Five different water temperature regimes were established by the use of water-bath tanks with thermostat controlled heaters and coolers. The thermal regimes were 34,27,20,14,and 7 degrees Celsius. Each thermal regime had 36 control and 72 experimental animals in separate, oxygenated glass containers. Two field grade pesticides (one herbicide "Propanil" and one insecticide "Malathion") were used to produce solutions which were at the industry-accepted LD/50/96. Experimental animals were acclimated to control water and then subjected for 96 hours to these pesticide concentrations at the indicated thermal regimes. Results indicate abrupt and extreme differences in toxicity due to the various thermal regimes. Malathion mortalities were far in excess of anticipated results at the higher temperatures while Propanil produced a step-wise increase inmortality in response to additional heat. Control group deaths due to acute thermal stress endorse the results of the pesticide mortality. Present crawfish industry guidelines on pesticide toxicity levels are routinely performed near 20 degrees Celsius. Field conditions in culture systems often exceed these temperatures and may influence the elevated mortalities found under those situations.

Article

References

Supplemental Documents

  • There are no supplementary documents for this article

Cited By

CrossRef Logo

Citations:

Google Scholar Logo

How to Cite

Gaudé III. AP. (1979). Thermal effects on pesticide toxicity for Louisiana red swamp crawfish (Procambarus clarkii). Freshwater Crayfish 7(1):171-177. doi: .

Author Information

Gaudé III. AP

Publication History

Funding Information

 

 

 

Member Login

Lost your password?
Back to Top