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Digestibility
Fish
Fishmeal replacement
Seriola dumerili
Survival
[EN] A 154-day trial was performed to assess the use of an alternative protein blend (corn
gluten, krill and meat meal) as a substitute for fishmeal in diets for juvenile yellowtail,
using four isolipidic (140 g/kg) and isoenergetic diets (24 MJ/kg) with the same digestible
protein content (50%). The control diet was FM100, without replacement, and in
FM66, FM33 and FM0, fishmeal was replaced at 33 g/kg, 66 g/kg and 100 g/kg,
respectively. At the end of the experiment, no differences in growth parameters were
observed. Fish fed the FM0 diet exhibited the lowest survival (23%). This high mortality
may be due to different factors, such as a dietary amino acid imbalance or some
antinutrient factors contained in the alternative ingredients. Feed intake, feed conversion
ratio, digestible protein intake and protein efficiency ratio were similar in all diets.
However, digestible energy intake and protein efficiency retention were lowest in fish
fed the FM0 diet. Apparent digestibility coefficients for protein, energy and amino
acids diminished as a substitution for fishmeal increased. Significant differences were
observed in the diet whole-fish body profile amino acid retention (AAR) ratio for the
seven essential amino acids. In summary, total fishmeal replacement by the blend assayed
was not feasible for yellowtail. The FM66 diet resulted in good growth, high
survival and good nutrient efficiency
Reserva de todos los derechos
Embargado
http://hdl.handle.net/10251/111523
Blackwell Publishing
A. Tomas-Vidal
F.J. Gallardo-Álvarez
Guillem Estruch-Cucarella
Sergio Godoy-Olmos
Miguel Jover Cerda
Silvia Martínez-Llorens
Aquaculture Nutrition
Inglés
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