Diel food intake and digestive enzyme production patterns in Solea senegalensis larvae
Navarro-Guillén, Carmen | Moyano, Francisco J. | Yúfera, Manuel
The aim of this study was to examine patterns of food intake and production of the main digestive enzymes of Senegalese sole larvae under a fixed 12h light:12h dark cycle. Daily gut content, soluble protein content and digestive enzyme activities were studied at different times of day in pelagic sole larvae (onset of feeding and 6days post-hatch; dph) and in benthonic sole post-larvae (20 and 30dph). The larvae displayed temporal changes in food intake throughout development. Pre-metamorphic larvae ceased feeding after lights were turned off. In contrast, post-metamorphic larvae continued to feed during the day, with a higher food intake occurring during dark phase. It was demonstrated that larval digestive enzymes, mainly lipases, were active before mouth opening. Tryptic activity varied with food intake at pre-metamorphic larvae, whereas its activity levels were kept along the day in post-metamorphic larvae.
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