Levels of organochlorines in Odonthestes bonariensis during different reproductive stages in La Florida (San Luis, Argentina).

RODRÍGUEZ, N.; NAVARRO BECERRA, N.; CID, F. D.; ANTÓN, R. I.; CAVIEDES-VIDAL E.

Uspallata, Mendoza

Congreso; XXIII Reunión Científica Anual de la Sociedad de Biología de Cuyo; 2005

Sociedad de Biología de Cuyo

La Florida (33°07?S-66°02?W) is an important water reservoir for the province of San Luis. Environmental pollutants, such as organochlorines (OCs) may affect aquatic wildlife. Recently, we reported the presence in La Florida of OCs in the water and fish. OCs are liposoluble and accumulated in the fat. Several authors have demonstrated that during the reproductive period of the fishes occurs a mobilization and transference of the lipids of the body to eggs and sperm. An interesting problem is to known if spawning represents an important route to eliminate OCs. To test this idea we analyzed the OCs concentration in silversides (O. bonariensis) captured in La Florida at different reproductive stages: before, during and after the reproductive period. OCs were assayed by GC-ECD. We detected 16 OCs (ng/g lipid), divided in 4 family: 1) HCHs (A:1079,7-B:1184,8-D:747,7): a, b, g, d HCH isomers; 2) DDTs (A:3387,5-B:2408,3-D:2928,3): DDE, DDD, DDT and Methoxychlor; and cyclodiene groups 3a) CHLs (A:802,8-B:862,3-D:541,0): Chlordanes and Heptachlors; 3b) ALDs: (A:1207,9-B:1451,5-D:880,2). No significant differences among reproductive stages were detected (ANOVA, p > 0,05). This fact may suggest that the spawning do not represent an important route of elimination the OCs in the silverside. Supported by CyT-UNSL 22/Q451 to ECV.