The relationship between dominance rank and feed intake following the introduction of novel feeds to African catfish
Identifieur interne : 001215 ( Main/Merge ); précédent : 001214; suivant : 001216The relationship between dominance rank and feed intake following the introduction of novel feeds to African catfish
Auteurs : C. G. Carter [Australie] ; A-W. A. Abdel-Warith [Royaume-Uni] ; S. J. Davies [Royaume-Uni]Source :
- Journal of Fish Biology [ 0022-1112 ] ; 2003-12.
Abstract
The experiment aimed to examine the effect of changing feeds on individual feed intake and feeding and dominance ranks in groups of African catfish. Following feeding on a commercial control feed (Con.) groups (n = 3) of 6 catfish were either fed fish meal (FM42) or maize gluten (MG32) based feeds for five days before being switched to the other feed for five days. Feed intake was significantly lower on FM42 than on Con. or MG32 and occurred whether FM42 was fed first or second after Con. Thus, the effect of changing the feed was feed specific. Stability (Kendall's coefficient of concordance) of feeding rank was higher in 5 out of the 6 groups when they were fed MG35 than when fed FM42. Six types of agonistic behaviours were identified and used to assign dominance rank, there were no correlations between dominance and feeding ranks in groups. This was probably due to non‐linear hierarchies with one dominant fish in each group. There were significant correlations between dominance and feeding ranks for combined data over the initial period (r = −0·51, P < 0·005, n = 36) and when analyzed for the two feeds. Correlations were stronger for MG35 (r = −0·41, P < 0·01) than for FM42 (r = −0·33, P < 0·05). The experiment demonstrated that the introduction of a novel feed can, but does not necessarily, alter feed intake. Of greater significance is the indication that when feed intake decreased the feeding hierarchy and its relationship to dominance rank became less stable.
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DOI: 10.1111/j.1095-8649.2003.216av.x
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G." last="Carter">C. G. Carter</name><affiliation wicri:level="1"><country xml:lang="fr" wicri:curation="lc">Australie</country><wicri:regionArea>(1School of Aquaculture, Tasmanian Aquaculture and Fisheries Institute, University of Tasmania, Locked Bag 1‐370, Launceston, Tasmania 7250</wicri:regionArea><wicri:noRegion>Tasmania 7250</wicri:noRegion></affiliation></author><author><name sortKey="Abdel Arith, A A" sort="Abdel Arith, A A" uniqKey="Abdel Arith A" first="A-W. A." last="Abdel-Warith">A-W. A. Abdel-Warith</name><affiliation wicri:level="1"><country xml:lang="fr" wicri:curation="lc">Royaume-Uni</country><wicri:regionArea>2 Department of Biological Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA</wicri:regionArea><wicri:noRegion>Plymouth PL4 8AA</wicri:noRegion></affiliation></author><author><name sortKey="Davies, S J" sort="Davies, S J" uniqKey="Davies S" first="S. J." last="Davies">S. J. Davies</name><affiliation wicri:level="1"><country xml:lang="fr" wicri:curation="lc">Royaume-Uni</country><wicri:regionArea>2 Department of Biological Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA</wicri:regionArea><wicri:noRegion>Plymouth PL4 8AA</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Fish Biology</title><idno type="ISSN">0022-1112</idno><idno type="eISSN">1095-8649</idno><imprint><publisher>Blackwell Science Ltd/Inc</publisher><pubPlace>Oxford, UK; Malden, USA</pubPlace><date type="published" when="2003-12">2003-12</date><biblScope unit="volume">63</biblScope><biblScope unit="supplement">s1</biblScope><biblScope unit="page" from="248">248</biblScope><biblScope unit="page" to="247">247</biblScope></imprint><idno type="ISSN">0022-1112</idno></series><idno type="istex">9C14B9663522C6F38F6ED9F9821C6208806908FC</idno><idno type="DOI">10.1111/j.1095-8649.2003.216av.x</idno><idno type="ArticleID">JFB216AV</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0022-1112</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The experiment aimed to examine the effect of changing feeds on individual feed intake and feeding and dominance ranks in groups of African catfish. Following feeding on a commercial control feed (Con.) groups (n = 3) of 6 catfish were either fed fish meal (FM42) or maize gluten (MG32) based feeds for five days before being switched to the other feed for five days. Feed intake was significantly lower on FM42 than on Con. or MG32 and occurred whether FM42 was fed first or second after Con. Thus, the effect of changing the feed was feed specific. Stability (Kendall's coefficient of concordance) of feeding rank was higher in 5 out of the 6 groups when they were fed MG35 than when fed FM42. Six types of agonistic behaviours were identified and used to assign dominance rank, there were no correlations between dominance and feeding ranks in groups. This was probably due to non‐linear hierarchies with one dominant fish in each group. There were significant correlations between dominance and feeding ranks for combined data over the initial period (r = −0·51, P < 0·005, n = 36) and when analyzed for the two feeds. Correlations were stronger for MG35 (r = −0·41, P < 0·01) than for FM42 (r = −0·33, P < 0·05). The experiment demonstrated that the introduction of a novel feed can, but does not necessarily, alter feed intake. Of greater significance is the indication that when feed intake decreased the feeding hierarchy and its relationship to dominance rank became less stable.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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