European sea bass and gilthead sea bream are often fed similar type of diets assuming that their nutritional requirements are also similar. The aim of this work was to compare the response of fingerlings of these two species when fed diets with different energy level. 1440 fingerling of sea bass and sea bream (initial body weight around 5 g) were equally distributed into twelve 1 m3 tanks connected with a recirculation system (temperature 22 - 24°C and DO above 5 ppm). Fish were fed twice a day until satiation. Two different experimental extruded diets containing 50% of protein and two levels of lipid i.e. 20% and 25% were tested in triplicate for 7 weeks. T-tests were used to distinguish between dietary and species performance (P<0.05). Bream grew faster with lower feed conversion compared to the bass. Protein retention was almost 40% in bream. No differences in performance or carcass composition were found for the diets in bream. In bass fish fed the higher energy diet had lower feed conversions, but similar growth and carcass composition. In summary, fingerling bass respond to higher energy levels by better feed efficiency and lipid retention.
Performances and carcass composition of European sea bass (Dicentrarchus labrax) and gilthead sea bream (Sparus aurata) fed diets with different energy levels: preliminary findings
BONALDO, ALESSIO;MARIANI, LORENZO;GATTA, PIER PAOLO
2004
Abstract
European sea bass and gilthead sea bream are often fed similar type of diets assuming that their nutritional requirements are also similar. The aim of this work was to compare the response of fingerlings of these two species when fed diets with different energy level. 1440 fingerling of sea bass and sea bream (initial body weight around 5 g) were equally distributed into twelve 1 m3 tanks connected with a recirculation system (temperature 22 - 24°C and DO above 5 ppm). Fish were fed twice a day until satiation. Two different experimental extruded diets containing 50% of protein and two levels of lipid i.e. 20% and 25% were tested in triplicate for 7 weeks. T-tests were used to distinguish between dietary and species performance (P<0.05). Bream grew faster with lower feed conversion compared to the bass. Protein retention was almost 40% in bream. No differences in performance or carcass composition were found for the diets in bream. In bass fish fed the higher energy diet had lower feed conversions, but similar growth and carcass composition. In summary, fingerling bass respond to higher energy levels by better feed efficiency and lipid retention.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
