[EN] The effect of partial or total dietary substitution of fishmeal (FM)
by vegetal protein sources on growth and feed efficiency was
carried out in on-growing gilthead sea bream (mean initial weight
131 g). The Control diet (FM 100) contained FM as the primary
protein source, while in Diets FM 25 and FM 0 the FM protein was
replaced at 75% and 100%, respectively, by a vegetable protein
mixture consisting of wheat gluten, soybean meal, rapeseed meal
and crystalline amino acids. Diets FM 25 and FM 0 also contained
krill meal at 47 g/kg in order to improve palatability. At the end of
the trial (after 158 d), fish survival was above 90%. Final weight
and the specific growth rate were statistically lower in fish fed the
Control diet (361 g and 0.64%/d), compared with 390–396 g and
0.69–0.70%/d after feeding vegetal diets. No significant differences
were found regarding feed intake and feed conversion ratio. The
digestibility of protein and amino acids (determined with chromium
oxide as indicator) was similar in all diets. The blood parameters
were not significantly affected by treatments. The activity
of trypsin and pepsin was significantly reduced after feeding Diet
FM 0. In the distal intestine, the villi length in fish fed Diet FM 25
was significantly longer and the intestine of the fish fed the FM
100 diet showed a smaller number of goblet cells. In conclusion, a
total FM substitution by a vegetal mix supplemented with synthetic
amino acids in on-growing sea bream is feasible.This work was supported by the Vicerrectorat d'Investigacio, Innovacio i Transferencia - Universitat Politecnica de Valencia, Project Name: Aquaculture feed without fishmeal (SP20120603). URLs of funder:http://www.upv.es/entidades/VIIT/info/indexnormalc.htm. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.Monge-Ortiz, R.; Martínez-Llorens, S.; Marquez, L.; Moyano-Lopez, FJ.; Jover Cerdá, M.; Tomas-Vidal, A. (2016). Potential use of high levels of vegetal proteins in diets for market-sized gilthead sea bream (Sparus aurata). Archives of Animal Nutrition. 70(2):155-172. https://doi.org/10.1080/1745039X.2016.1141743S15517270
