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The Effect of Decreased Ration on Feeding Hierarchies in Groups of Greenback Flounder (Rhombosolea Tapirina: Teleostei)

Published online by Cambridge University Press:  11 May 2009

C.G. Carter ,
G.J. Purser ,
D.F. Houlihan  and
P. Thomas
C.G. Carter
Affiliation:
Department of Aquaculture, University ofTasmania, PO Box 1214, Launceston, Tasmania 7250, Australia. Department of Zoology, University of Aberdeen, Tillydrone Avenue, Aberdeen, AB9 2TN
G.J. Purser
Affiliation:
Department of Aquaculture, University ofTasmania, PO Box 1214, Launceston, Tasmania 7250, Australia.
D.F. Houlihan
Affiliation:
Department of Zoology, University of Aberdeen, Tillydrone Avenue, Aberdeen, AB9 2TN
P. Thomas
Affiliation:
Department of Aquaculture, University ofTasmania, PO Box 1214, Launceston, Tasmania 7250, Australia.
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Extract

The aims of the present study were to investigate food consumption, growth and the dynamics of feeding hierarchies in the same groups of juvenile greenback flounder (Rhombosolea tapirina: Teleostei) fed either high or low rations. Differential food consumption by individual greenback flounder held in groups of 20 showed the presence of feeding hierarchies in which individuals consumed between 0 and 22% of the available food. Inter-individual differences in food consumption resulted in different growth rates leading to growth depensation (measured as an increase in the coefficient of variation for weight). Intra-individual differences in food consumption tended to be larger for flounder which consumed a lower share of the available food. When the group ration was reduced the inter-individual and intra-individual variations in food consumption increased. Consequently, the relationship between inter-individual and intra-individual variation in food consumption tended to become stronger at lower food availability and indicated an increase in the strength of the feeding hierarchies. This study suggests that individual differences in food consumption, mediated through exploitation competition, contribute to growth depensation in this species of flatfish.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 76 , Issue 2 , May 1996 , pp. 505 - 516
Copyright
Copyright © Marine Biological Association of the United Kingdom 1996

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