Nates and Felder: Growth and maturation of Lepidophthalmus sinuensis 



539 



ticide Sevin®, a practice unlikely to change in the 

 absence of proven alternative management strate- 

 gies. From our observations, such applications have 

 usually been contained within drained or slightly 

 filled culture ponds and limited only to control of ex- 

 cessive thalassinid densities. It is possible that re- 

 ductions in frequencies of such applications can be 

 achieved by timing of treatments to pre-empt repro- 

 ductive peaks or by limiting pesticide applications 

 only to infestations that are found to include high 

 percentages of mature or near-mature females, such 

 as we observed in this study most often in the fourth 

 annual quarter. Any measure that reduces applica- 

 tion rates and frequencies may lessen ecological risks 

 and contribute to effectiveness of carbaryl degrada- 

 tion prior to flushing treated ponds into surround- 

 ing environments. 



Acknowledgments 



We thank G. T. Rizzuto, R. G. Jaeger, R L. Klerks, 

 and R. R. Twilley, University of Southwestern Loui- 

 siana, and R. Lemaitre, Smithsonian Institution, for 

 comments on earlier versions of the manuscript. We 

 are also grateful to many associates of the Agro- 

 soledad S. A. shrimp farm, particularly J. V. 

 Mogollon, L. Mogollon, G. Moreno, and M. Torralvo, 

 who provided access to sites in Colombia, and A. Ar- 

 royo, D. Espitia, and S. Garcia, who assisted in col- 

 lecting population data there. Among others who 

 assisted with field and laboratory work, we thank L. 

 Borda, R. Bourgeois, V. Fuentes, R. Griffis, R. 

 Lemaitre, C. Moreau, S. de A. Rodrigues. and K. 

 Strasser. Fellowship support for this project was pro- 

 vided to S. F. Nates from the Institute Colombiano 

 para el Desarrollo de la Ciencia y la Tecnologia Fran- 

 cisco Jose de Caldas (COLCIENCIAS), Colombia. 

 Logistical support was provided through ACUANAL, 

 BANCOLDEX, and the efforts of C. M. Sanin. Sup- 

 port was provided to D. L. Felder through U.S. Min- 

 erals Management Service Cooperative Agreement 

 14-35-0001-30470, U.S. Fish and Wildlife Service 

 Cooperative Agreement 14-16-0009-89-96— Task 

 Order No. 6, NOAA Louisiana Sea Grant College 

 Progi-am Grant RyCFB-21. and U.S. Department of 

 Energy Grant No. DE-FG02-97ER12220. 



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