The feeding behaviour of larval European sea bass (Dicentrarchus labrax, L.) was analysed in relation to temperature and prey density under controlled laboratory conditions with the aim to assess the ability of larval fish to change the feeding tactic as a response to environmental changes. Larvae were acclimated for 20 days at three different temperatures (19, 22 and 26°C), and their feeding behaviour was then video-recorded in experimental trials, at two prey densities, consisting of swarms of 400/l and 1440/l Artemia nauplii. Results showed that there was a significant effect of the interaction between temperature and prey density on the proportion of swimming activity that was reduced at the high temperature-high prey density combination. This suggested a switching in the larval feeding behaviour from an active to an ambush tactic, when the temperature reached 26°C and the prey density was 1440 /l Artemia nauplii. These results are consistent with the current literature on fish larval behaviour in showing that the foraging tactic can be modulated by the interaction of different abiotic and biotic factors characterising the rearing environment.
|Titolo:||Feeding Behaviour of Larval European Sea Bass (Dicentrarchus labrax L.) in Relation to Temperature and Prey Density|
|Data di pubblicazione:||2015|
|Appare nelle tipologie:||2.1 Articolo su rivista |
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|2015 Malavasi et al J_J_Aquacul_Res_2_1_011 (2).pdf||Documento in Pre-print||Accesso chiuso-personale||Open Access Visualizza/Apri|