Document Detail


Social isolation and aggressiveness in the Amazonian juvenile fish Astronotus ocellatus.
MedLine Citation:
PMID:  16710517     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We tested the effect of social isolation on the aggressiveness of an Amazonian fish: Astronotus ocellatus. Ten juvenile fishes were transferred from a group aquarium (60 x 60 x 40 cm) containing 15 individuals (without distinguishing sex) to an isolation aquarium (50 x 40 x 40 cm). Aggressiveness was tested by means of attacks on and displays toward the mirror image. The behavior was video-recorded for 10 min at a time on 4 occasions: at 30 min, 1 day, 5 days and 15 days after isolation. The aggressive drive was analyzed in three ways: latency to display agonistic behavior, frequency of attacks and specific attacks toward the mirror image. The latency to attack decreased during isolation, but the frequency of mouth fighting (a high aggressive attack) tended to increase, indicating an augmented aggressive drive. Our findings are congruent with the behavior of the juvenile cichlid, Haplochromis burtoni but differ from the behavior observed in another cichlid, Pterophylum scalare. Increased aggressiveness in A. ocellatus may be mediated by means of the primer effect, the effect of prior residence or processes involving recognition of a conspecific.
Authors:
E Gonçalves-de-Freitas; T C Mariguela
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Publication Detail:
Type:  Journal Article     Date:  2006-05-15
Journal Detail:
Title:  Brazilian journal of biology = Revista brasleira de biologia     Volume:  66     ISSN:  1519-6984     ISO Abbreviation:  Braz J Biol     Publication Date:  2006 Feb 
Date Detail:
Created Date:  2006-05-19     Completed Date:  2006-08-31     Revised Date:  2007-09-06    
Medline Journal Info:
Nlm Unique ID:  101129542     Medline TA:  Braz J Biol     Country:  Brazil    
Other Details:
Languages:  eng     Pagination:  233-8     Citation Subset:  IM    
Affiliation:
Departamento de Zoologia e Botânica, IBILCE/UNESP, CEP 15054-000, São José do Rio Preto, SP, Brazil. elianeg@ibilce.unesp.br
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MeSH Terms
Descriptor/Qualifier:
Aggression / physiology*
Agonistic Behavior / physiology
Animals
Behavior, Animal / physiology
Fishes / physiology*
Reaction Time
Social Isolation*
Visual Perception

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