| Abstrakt: |
The feeding behaviour and growth performance ofred porgy subjected to restrictive self-feedingregimes (diurnal, nocturnal) were compared tothose of fish given free access to feed. Fishwere held at two densities (50 or 100 fish pertank) and studies were carried out at differentseasons (summer-autumn-winter-spring). The fishwere held in 500-l tanks under ambientconditions and were fed by means of electronicself-feeders, connected to a computer thatrecorded their activation. Neither feedingregimes nor fish density had marked influenceson mortality, specific growth rate, feedefficiency or body composition, except forsummer, when night feeding and low density leadto increased mortality and decreased growth.Within the first 10 days of exposure torestrictive feeding conditions, the fishlearned to activate the self-feeders mainlywithin the hours that food was available, andby the end of each 8-week period, activation ofthe self-feeders was limited to the hours offood availability. As a consequence, mealtiming did not have any significant influence on thegrowth of red porgy. [ABSTRACT FROM AUTHOR] |
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