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Food Competition In Small Groups Of Juvenile Gilthead Sea Bream (Sparus Aurata)

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Title: Food Competition In Small Groups Of Juvenile Gilthead Sea Bream (Sparus Aurata)
Authors: Goldan, Oded
Popper, Dan
Karplus, IIan
Keywords: agonistic behavior, food competition, social control of growth, Sparus aurata
LC Subject Headings: Fish culture--Israel--Periodicals.
Fish culture--Periodicals.
Issue Date: 2003
Publisher: Israeli Journal of Aquaculture - BAMIGDEH
Citation: Goldan, O., Popper, D., & Karplus, I. (2003). Food Competition In Small Groups Of Juvenile Gilthead Sea Bream (Sparus Aurata). The Israeli Journal of Aquaculture - Bamidgeh, 55(2), 94-106.
Series/Report no.: The Israeli Journal of Aquaculture - Bamidgeh
Abstract: Four groups of single-size and four groups of mixed-size gilthead sea bream (Sparus aurata) were raised in small observation cells for 16 days. Each group consisted of four individually marked juveniles. Agonistic behavior, motor activity and feeding behavior were monitored on days 1, 4, 10 and 16. At the end of the study, the weight gain was measured. Aggressive interactions occurred almost exclusively during feeding. A linear dominance hierarchy stabilized sooner in the mixed groups than in the single-size groups. Rank in the hierarchy had a profound effect on the behav- ior and growth of all group members. The dominant fish in each group carried out more aggres- sive acts and bit at food particles more often than the other group members. The dominant fish also had the highest relative specific growth rate. Direct competition for food is probably the major social mechanism regulating growth in small groups of juveniles of this species when food is lim- ited and defendable. The relevance of these findings for the commercial culture of this species is discussed.
Pages/Duration: 13 pages
ISSN: 0792-156X
Appears in Collections:IJA Volume 55, Issue 2, 2003

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