Consommation volontaire d'aliments en situation d'alternance de lumière et d'obscurité chez<i>Heterobranchus longifilis</i>

Avit, Jean-Baptiste L. F.; Luquet, P.

doi:10.1051/alr:1995044

Cited by 8 publications

(10 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In agreement with empirical findings in several catfish species (Clarias gariepinus, Bruton 1979; Silurus glanis, Anthouard et al 1987;Hoplosternum littorale, Boujard et al 1990) as well as with previous studies on H. longifilis (Avit and Luquet 1995;Baras et al 1998), fish placed under 12L:12D were essentially nocturnal. The present study provides further evidence that such an activity pattern was trained by light/dark alternation independently of the duration of each phase, and that starved fish show no activity rhythm under permanent illumination or darkness.…”

Section: Discussionsupporting

confidence: 92%

“…Catfishes have been shown to be essentially nocturnal foragers (e.g. Bruton 1979;Avit and Luquet 1995;Boujard and Luquet 1996;Baras et al 1998) growing faster when fed at night than at other times with equivalent amounts of food (Kerdchuen and Legendre 1991). They can cope with low levels of dissolved oxygen and exhibit air-gaping behaviours at the water surface, although this activity seems to require more energy from the fish than directly extracting oxygen from water (Bevan and Kramer 1987).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Daily activity rhythms of the African catfishHeterobranchus longifilis(Clariidae) in an experimental enclosure

Anselme

Bernaerts

Poncin

2008

Aquat. Living Resour.

View full text Add to dashboard Cite

-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.

show abstract

Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Daily activity rhythms of the African catfishHeterobranchus longifilis(Clariidae) in an experimental enclosure

Anselme

Bernaerts

Poncin

2008

Aquat. Living Resour.

View full text Add to dashboard Cite

show abstract

“…Cannibalism took place during the day or at night, but was mostly (average of all experiments: 66·5%) nocturnal, and this was not really surprising as catfishes are usually nocturnal foragers (Boujard & Luquet, 1996). Avit & Luquet (1995), who studied the periodicity of demand feeding behaviour in juvenile (7-12 g) vundu under 12L : 12D with demand feeders, also observed that 70% of the daily food ration was consumed at night, and this was similar to the findings by Britz & Pienaar (1992) for Clarias gariepinus. The experiments under continuous darkness or illumination in the present study provided further evidence that the periodicity of cannibalism was more dependent on illumination than on time of the day, suggesting that the rhythm observed under 12L : 12D was nycthemeral rather than circadian.…”

Section: Discussionmentioning

confidence: 90%

Sibling cannibalism among juvenile vundu under controlled conditions. II. Effect of body weight and environmental variables on the periodicity and intensity of type II cannibalism

Baras

Tissier

Philippart

et al. 1999

Journal of Fish Biology

View full text Add to dashboard Cite

Cannibalism among starved groups of juvenile (19-48 days old) vundu catfish Heterobranchus longifilis was 66·5% nocturnal, and its impact under modified day length was proportional to the duration of the dark phase. Shallow depth and high population density decreased the intensity of cannibalism, whereas low density and deeper environments had an opposite effect. The presence of refuges had no significant effect on cannibalism. The maintenance (R maint ) and maximum (R max ) daily food rations (% day 1 ) of cannibals feeding on live prey were modelled as R maint =3·899 W C 0·327 (r 2 =0·684; d.f.=31), and R max =49.545 W C 0·321 (r 2 =0·999; d.f.=5), where W C was the body weight of the cannibal (g). The latter model indicated that the impact of a cannibal on a population decreased by a 20% margin each time the cannibal doubled its body weight, and suggested that cannibalism among vundu would become insignificant for cannibals heavier than 30 g. The significance of these findings is discussed within the contexts of vundu aquaculture and of general, conceptual models of the dynamics of cannibalism among fishes. 1999 The Fisheries Society of the British Isles

show abstract

“…Despite the increasing interest in this species (e.g. Kerdchuen & Legendre, 1991, 1994Avit & Luquet, 1995;Vandewalle et al, 1997), cannibalism among wild or cultured vundu has received little or no attention. Cannibalism, and especially coeval (intracohort) cannibalism generally is very intense among larvae and juveniles of fast growing predatory species, and may jeopardize their aquaculture (Bry & Gillet, 1980;Loadman et al, 1986; Tel.…”

Section: Introductionmentioning

confidence: 99%

Sibling cannibalism among juvenile vundu under controlled conditions. I. Cannibalistic behaviour, prey selection and prey size selectivity

Baras

1999

Journal of Fish Biology

View full text Add to dashboard Cite

Sibling cannibalism among vundu Heterobranchus longifilis larvae started at the age of 4 days, with the prey caught tail-first then swallowed up to the head, which was eventually discarded (type I cannibalism). At 17 days old, this type of cannibalism vanished and was replaced by the ingestion of the whole prey (type II cannibalism), which could only be exerted by predators six times as heavy as their prey. Type II cannibalism consisted of a seemingly opportunistic ambush attack by a formerly passive predator towards a disorientated prey. It required no preliminary aggression or chase, or even contact with the prey, suggesting that the attack was not mediated by the tactile sense, and that cannibalism was independent of aggressive behaviour. When alternative food resources (formulated feed, live tilapia prey) were available, the intensity of cannibalism decreased but pellet-eaters or tilapia predators always achieved lower growth rates than those feeding on conspecifics, suggesting that cannibalism was the most advantageous foraging tactic. Losses to cannibalism among populations of 30-day old juvenile vundu with an initial ratio of 4% of cannibals were as high as 75·5-79·9% over 15 days. Predation peaked during the first days (up to 2·8 prey C 1 day 1 ), then vanished progressively as surviving prey grew faster than cannibals and escaped their predation. Cannibals preferred consuming the largest prey available with respect to the logistics of cannibalism (body weight ratio of 6·0). This preference for large prey was interpreted both as a foraging tactic aiming to maximize the energetic return, and as foraging strategy enabling the cannibals to exploit their prey as long as possible. Based on these data, comprehensive models of the impact of cannibalism on vundu populations were developed. 1999 The Fisheries Society of the British Isles

show abstract

Consommation volontaire d'aliments en situation d'alternance de lumière et d'obscurité chezHeterobranchus longifilis

Cited by 8 publications

References 8 publications

Daily activity rhythms of the African catfishHeterobranchus longifilis(Clariidae) in an experimental enclosure

Daily activity rhythms of the African catfishHeterobranchus longifilis(Clariidae) in an experimental enclosure

Sibling cannibalism among juvenile vundu under controlled conditions. II. Effect of body weight and environmental variables on the periodicity and intensity of type II cannibalism

Sibling cannibalism among juvenile vundu under controlled conditions. I. Cannibalistic behaviour, prey selection and prey size selectivity

Contact Info

Product

Resources

About