Influence of dietary levels of soybean meal on the performance and gut histology of gilthead sea bream (Sparus aurata L.) and European sea bass (Dicentrarchus labrax L.)
2008
Bonaldo, Alessio | Roem, Andries J | Fagioli, Paolo | Pecchini, Alessio | Cipollini, Irene | Gatta, Pier Paolo
The present study was performed to determine the effect of soybean meal (SBM) on the performance and gut histology of gilthead sea bream and European sea bass. Three isonitrogenous and isolipidic extruded diets (crude protein, 470âgâkg−1 diet; crude fat, 200âgâkg−1 diet) were formulated containing 0 (0âSBM), 180 (180âSBM) and 300 (300âSBM)âgâkg−1 diet SBM and tested on both species in two separate experiments. Fish at an initial average weight of around 18âg were randomly allocated to 800âL square tanks connected to a closed recirculating system. The trials lasted 80 days for sea bream and 89 days for sea bass. Fish were handâfed to apparent satiation. Increasing the level of SBM had no significant effects on the specific growth rate, feed intake and feed conversion rate in both the species. In the sea bream distal intestine, lamina propria was moderately and diffusely expanded in some fish due to an increase in cell infiltration represented by mononuclear cells, this finding being more frequent in animals fed diet 300âSBM. No other morphological alterations in intestinal folds, enterocytes or other inflammation signs were noticed in the sea bream distal intestine of any group. No histological differences were found in sea bass in any experimental group.
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