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Sub-lethal concentrations of monocrotophos affect aggressive behavior of the fishes Astyanax altiparanae Garutti & Britski (Teleostei, Characidae) and Oreochromis niloticus (Linnaeus) (Teleostei, Cichlidae)

Abstract

This study investigated the effects of sublethal concentrations of the pesticide monocrotophos (organophosphate) on the agonistic behavior of two fishes species, Astyanax altiparanae Garutti & Britski, 2000 (lambari) and Oreochromis niloticus (Linnaeus, 1758) (Nile tilapia). Sublethal concentrations of the pesticide for the two species were determined and lambari was more resistant than Nile tilapia. The sublethal concentrations were smaller than 400 mgl-1 for lambari and 20 mgl-1 for Nile tilapia. The two species were tested in grouping conditions (triads) and isolation, under monocrotophos concentrations of 200 mgl-1 for lambari and 5 mgl-1 for Nile tilapia. The concentration decreased the aggressiveness in lambari, but in Nile tilapia an opposite effect was detected. The results show a species-specific effect of the monocrotophoson aggression.

Teleostei; Astyanax altiparanae; Oreochromis niloticus; aggressive behavior; organophosphate; monocrotophos; sub-lethal concentrations


Sub-lethal concentrations of monocrotophos affect aggressive behavior of the fishes Astyanax altiparanae Garutti & Britski (Teleostei, Characidae) and Oreochromis niloticus (Linnaeus) (Teleostei, Cichlidae)

André Luis da Cruz

Rua Teodoro Demonte 268, ap. 12, 15091-260 São José do Rio Preto, São Paulo, Brasil. E-mail: ajcruz@starmedia.com

ABSTRACT

This study investigated the effects of sublethal concentrations of the pesticide monocrotophos (organophosphate) on the agonistic behavior of two fishes species, Astyanax altiparanae Garutti & Britski, 2000 (lambari) and Oreochromis niloticus (Linnaeus, 1758) (Nile tilapia). Sublethal concentrations of the pesticide for the two species were determined and lambari was more resistant than Nile tilapia. The sublethal concentrations were smaller than 400 mgl-1 for lambari and 20 mgl-1 for Nile tilapia. The two species were tested in grouping conditions (triads) and isolation, under monocrotophos concentrations of 200 mgl-1 for lambari and 5 mgl-1 for Nile tilapia. The concentration decreased the aggressiveness in lambari, but in Nile tilapia an opposite effect was detected. The results show a species-specific effect of the monocrotophoson aggression.

Key words: Teleostei, Astyanax altiparanae, Oreochromis niloticus, aggressive behavior, organophosphate, monocrotophos, sub-lethal concentrations

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ACKNOWLEDGEMENTS: This work was supported by Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP nº 96/05322-9). The author is grateful to Dr. G.L. Volpato for the supervision and A.C.B. Tardivo for the skilful technical assistance.

Received in 13.V.2002; accepted in 23.X.2002.

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Publication Dates

  • Publication in this collection
    11 May 2009
  • Date of issue
    Dec 2002

History

  • Received
    13 May 2002
  • Accepted
    23 Oct 2002
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