Changes in behavioural response of Mediterranean Seabass (Dicenthratus labrax L.) under different feeding distributions

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Captive-induced behavioural deviations mayinvolve many aspects of fish behaviour such asswimming activity and enhancement of individualaggressiveness. We studied seabass(Dicentrarchus labrax) behaviour as a functionof manual and automatic feeding distributionmodes. Under manual mode, the food is distributedover an extended area for a longer period,and its precise location is not always predictable,while with pneumatic automatic feeders,fish receive the same amount of resource,which is concentrated in the same surface areaover a shorter period. We compared seabassbehaviour under automatic and manual conditionscollecting video image recordings before,during, and after feeding distribution, in themorning and in afternoon, on two differentdays, and analysing data within independentsessions of measurements. Feeding modes significantlyaffected swimming behaviour: automatically-fed fish were characterised by verticalmovements through the water column (towardsthe surface and bottom) and by horizontalswimming. Manually-fed fish were insteadcharacterised by sharp direction changes duringtheir swimming, mostly towards the surface.Feeding distribution induced changes incollision frequency and elicited aggressivebehaviour. In particular, agonistic behaviour(i.e. a fish attacks another fish) was almostexclusively recorded during the feeding underautomatic distribution, whereas it was constantlyexpressed during all the distributionphases under manual mode
Lingua originaleEnglish
pagine (da-a)121-125
Numero di pagine5
RivistaItalian Journal of Animal Science
Stato di pubblicazionePublished - 2009

All Science Journal Classification (ASJC) codes

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