caa a22 4500 606227237 CHVBK 20210128101157.0 cr unu---uuuuu 210128e20150701xx s 000 0 eng 10.1007/s10641-015-0395-3 doi (NATIONALLICENCE)springer-10.1007/s10641-015-0395-3 Feeding hatchery-reared dusky grouper Epinephelus marginatus juveniles on live prey: implications for restocking [Elektronische Daten] [Valeria Donadelli, Alessandro Longobardi, Maria Finoia, Giovanna Marino] Among the behavioural factors affecting survival of hatchery-reared fish when released into the wild, inefficient foraging is considered to be a major behavioural deficit. The present study investigates the ability of hatchery-produced, pellet-reared dusky grouper Epinephelus marginatus juveniles to recognize and catch live prey (sea bass Dicentrarchus labrax fingerlings 30-80mm TL) and analyses the effects of a training period on their foraging performance. Juvenile E. marginatus (3+ years, 270-330mm TL) showed an innate ability to recognize and capture live D. labrax fingerlings as latency time to first attack was very short (<1min). Older and larger-sized juvenile E. marginatus (4+ years, 350-400mm TL) are not immediately able to recognize live D. labrax as preys and no attack was observed in the first 2days. A 10day training period involving live preys improved foraging performance in both younger and older juveniles. The effect was more evident for older E. marginatus in which the ability to recognize prey increased and the latency time to first attack and to first successful attack with experience decreased. For both groups, training also increased the total number of lunges, number of successful lunges and consequently the number of preys eaten. Training should be performed using appropriate sized prey, since smaller-sized E.marginatus prefer smaller preys. Thus, although prey recognition and capture seem to be innate, experience of live prey improves the foraging performance of hatchery-reared E. marginatus of different age-size classes. Springer Science+Business Media Dordrecht, 2015 Foraging nationallicence Behaviour nationallicence Training nationallicence Learn by experience nationallicence Donadelli Valeria ISPRA, Italian National Institute for Environmental Protection and Research, Via di Castel Romano 100, 00128, Rome, Italy aut Longobardi Alessandro ISPRA, Italian National Institute for Environmental Protection and Research, Via di Castel Romano 100, 00128, Rome, Italy aut Finoia Maria ISPRA, Italian National Institute for Environmental Protection and Research, Via Vitaliano Brancati 60, 00144, Rome, Italy aut Marino Giovanna ISPRA, Italian National Institute for Environmental Protection and Research, Via Vitaliano Brancati 60, 00144, Rome, Italy aut Environmental Biology of Fishes Springer Netherlands 98/7(2015-07-01), 1757-1766 0378-1909 98:7<1757 2015 98 10641 https://doi.org/10.1007/s10641-015-0395-3 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10641-015-0395-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Donadelli Valeria ISPRA, Italian National Institute for Environmental Protection and Research, Via di Castel Romano 100, 00128, Rome, Italy aut NATIONALLICENCE 700 1- Longobardi Alessandro ISPRA, Italian National Institute for Environmental Protection and Research, Via di Castel Romano 100, 00128, Rome, Italy aut NATIONALLICENCE 700 1- Finoia Maria ISPRA, Italian National Institute for Environmental Protection and Research, Via Vitaliano Brancati 60, 00144, Rome, Italy aut NATIONALLICENCE 700 1- Marino Giovanna ISPRA, Italian National Institute for Environmental Protection and Research, Via Vitaliano Brancati 60, 00144, Rome, Italy aut NATIONALLICENCE 773 0- Environmental Biology of Fishes Springer Netherlands 98/7(2015-07-01), 1757-1766 0378-1909 98:7<1757 2015 98 10641