Protein requirement for maintenance and maximum growth of two-banded seabream ( Diplodus vulgaris ) juveniles
2008; Wiley; Volume: 15; Issue: 1 Linguagem: Inglês
10.1111/j.1365-2095.2008.00570.x
ISSN1365-2095
AutoresRodrigo Ozório, Luísa M.P. Valente, Sandra Correia, Pedro Pousão‐Ferreira, Alfredo Damasceno-Oliveira, C. Escórcio, Aires Oliva‐Teles,
Tópico(s)Aquatic life and conservation
ResumoThe effects of various dietary protein levels on growth performance, whole body composition and nutrient utilization were studied in two-banded sea bream (Diplodus vulgaris), a candidate species for aquaculture. Fish (initial weight 6.1 g) were fed to satiety six iso-energetic diets, containing 5%, 12.5%, 25%, 35%, 45% or 55% of crude protein during 72 days. Fish fed 35% and 45% protein attained better growth and feed utilization than the other groups (P < 0.05). Daily growth index and feed conversion ratio were the poorest for fish fed 5% and 12.5% protein (P < 0.001), while the 25% and 55% protein groups had intermediate performance. Lipid retention increased significantly from 13.7% to 30.1% (P < 0.0001) and protein retention decreased from 35.5% to 21.3% (P < 0.01) with increasing protein levels from 12.5% to 45%. Muscle protein, lipid and energy concentrations were not significantly affected by dietary protein level. The estimated protein requirement for maintenance and maximum growth of two-banded seabream growing from 6 to 20 g were 7.5% and 35.7%, respectively. Protein requirements as calculated from body protein gain were 2.3 and 6.5 g of protein intake per kilogram body weight per day.
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