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Publication
Alternative formulations for gilthead seabream diets: towards a more sustainable production
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Advisor(s)
Abstract(s)
To support the expected increase in aquaculture production during the next years,
a wider range of alternative ingredients to fishmeal is needed, towards contributing
to an increase in production sustainability. This study aimed to test diets formulated
with non‐conventional feed ingredients on gilthead seabream (Sparus aurata) growth
performance, feed utilization, apparent digestibility of nutrients and nutrient outputs
to the environment. Four isonitrogenous and isoenergetic diets were formulated:
a control diet (CTRL) similar to a commercial feed and three experimental diets
containing, as main protein sources, plant by‐products, glutens and concentrates
(PLANT); processed animal proteins (PAP); or micro/macroalgae, insect meals and
yeast (EMERG). Diets were tested in triplicate during 80 days. The EMERG treatment
resulted in lower fish growth performance, higher FCR and lower nutrient and energy
retentions than the other treatments. The lowest protein digestibility was found
for the EMERG diet, which caused increased nitrogen losses. The PLANT and PAP
treatments resulted in better fish growth performance, higher nutrient and energy
retentions, and lower FCR than the CTRL treatment. The significant improvement
in FCR found for fish fed PLANT and PAP diets and the high protein digestibility of
these diets contribute towards minimizing the environmental impacts of seabream
production.
Description
Keywords
Alternative ingredients Gilthead seabream (Sparus aurata) Insect meal Terrestrial animal proteins Plant by‐products Dieta mediterrânica
Citation
Publisher
Wiley