Reference : Daily activity rhythms of the African catfish Heterobranchus longifilis (Clariidae) i...
Scientific journals : Article
Life sciences : Aquatic sciences & oceanology
Social & behavioral sciences, psychology : Animal psychology, ethology & psychobiology
http://hdl.handle.net/2268/5279
Daily activity rhythms of the African catfish Heterobranchus longifilis (Clariidae) in an experimental enclosure
English
Anselme, Patrick mailto [Université de Liège - ULg > Département des sciences cognitives > Neuroscience comportementale et psychopharmacologie expér. >]
Bernaerts, Pascale [> > > >]
Poncin, Pascal mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Biologie du comportement - Ethologie et psychologie animale >]
2008
Aquatic Living Resources
EDP Sciences
21
4
419-422
Yes (verified by ORBi)
International
0990-7440
Les Ulis
France
[en] Catfish ; activity rhythm ; air gaping ; behaviour ; group size
[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.
Researchers
http://hdl.handle.net/2268/5279
10.1051/alr:2008055

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