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Effects of Trophic Poisoning with Methylmercury on the Appetitive Elements of the Agonistic Sequence in Fighting-Fish (Betta Splendens)

Published online by Cambridge University Press:  10 April 2014

Amauri Gouveia Jr. ,
Caio Maximino de Oliveira ,
Cynthia Ferreira Romão ,
Thiago Marques de Brito  and
Dora Fix Ventura
Amauri Gouveia Jr.*
Affiliation:
Universidade Federal do Pará Universidade Estadual Paulista, Bauru
Caio Maximino de Oliveira
Affiliation:
Universidade Estadual Paulista, Bauru
Cynthia Ferreira Romão
Affiliation:
Universidade Estadual Paulista, Bauru
Thiago Marques de Brito
Affiliation:
Universidade Estadual Paulista, Bauru
Dora Fix Ventura
Affiliation:
Universidade de São Paulo
*
Correspondence concerning this article should be addressed to Amauri Gouveia Jr., Departamento de Fisiologia, Centro de Ciências Biológicas, UFPA/Campus Guamá – r., Belém – PA, Brazil. E-mail: [email protected]
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Abstract

The aggressive display in Betta splendens is particularly prominent, and vital to its adaptation to the environment. Methylmercury is an organic variation of Hg that presents particularly pronounced neuro-behavioral effects. The present experiments aim to test the effect of acute and chronic poisoning with methylmercury on the display in Bettas. The animals were poisoned by trophic means in both experiments (16 ug/kg in acute poisoning; 16 ug/kg/day for chronic poisoning), and tested in agonistic pairs. The total frequency of the display was recorded, analyzing the topography of the agonistic response. The methylmercury seems to present a dose- and detoxification-dependent effect on these responses, with a more pronounced effect on motivity in acute poisoning and on emotionality in the chronic poisoning. It is possible that this effect could be mediated by alteration in the mono-amino-oxidase systems.

El despliegue agresivo en la Betta splendens es especialmente prominente y es vital para su adaptación al medio ambiente. Metil-mercurio es una variación orgánica de Hg que presenta efectos neuro-conductuales especialmente pronunciados. Los experimentos actuales intentan poner aprueba el efecto de envenenamiento agudo y crónico con metil-mercurio sobre el despliegue en Bettas. Los animales fueron envenenados tróficamente en ambos experimentos (16 ug/kg e el envenenamiento agudo) y probados en parejas agonistas. Se registró la frecuencia total del despliegue, analizando la topografía de la respuesta agonista. El metil-mercurio parece presentar un efecto dependiente de la dosis y de la detoxificación sobre estas respuestas, con un efecto más pronunciado sobre la motilidad en el envenenamiento agudo y sobre la emotividad en el envenenamiento crónico. Posiblemente, este efecto podría mediarse por la alteración en los sistemas de mono-amino-oxidasa.

Keywords

methylmercuryaggressionemotional behaviorBetta splendensmetil-mercurioagresiónconducta emocionalBetta splendens
Type
Articles
Information
The Spanish Journal of Psychology , Volume 10 , Issue 2 , November 2007 , pp. 436 - 448
Copyright
Copyright © Cambridge University Press 2007

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