Article (Scientific journals)
Daily activity rhythms of the African catfish Heterobranchus longifilis (Clariidae) in an experimental enclosure
Anselme, Patrick; Bernaerts, Pascale; Poncin, Pascal
2008In Aquatic Living Resources, 21 (4), p. 419-422
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Keywords :
Catfish; activity rhythm; air gaping; behaviour; group size
Abstract :
[en] The swimming, air-gaping, and agonistic behaviours of Heterobranchus longifilis (318 +/- 67 mm) were examined while fish were in a fasted state under 12L: 12D and variable group size ( 2, 5, 10 and 15 fish) in a 1000-L aquarium. Fish exhibited a predominantly nocturnal activity pattern independent of group size. A diurnal peak of activity occurred, however, at the usual feeding time. A reduction in frequency of agonistic interactions was observed in larger groups. Five fish were then observed under 72L: 0D and 0L: 72D. The nocturnal activity pattern remained, contrary to the diurnal peak, and was independent of the duration of illumination or darkness. These results suggest the absence of biological clock in H. longifilis, although fish may somehow be influenced by past feeding experience. Behavioural plasticity in this species may provide potential for aquaculture in northern latitudes.
Disciplines :
Animal psychology, ethology & psychobiology
Aquatic sciences & oceanology
Author, co-author :
Anselme, Patrick ;  Université de Liège - ULiège > Département des sciences cognitives > Neuroscience comportementale et psychopharmacologie expér.
Bernaerts, Pascale
Poncin, Pascal ;  Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Biologie du comportement - Ethologie et psychologie animale
Language :
English
Title :
Daily activity rhythms of the African catfish Heterobranchus longifilis (Clariidae) in an experimental enclosure
Publication date :
2008
Journal title :
Aquatic Living Resources
ISSN :
0990-7440
eISSN :
1765-2952
Publisher :
EDP Sciences, Les Ulis, France
Volume :
21
Issue :
4
Pages :
419-422
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 11 January 2010

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