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.)

By A. Bonaldo, A. Roem, P. Fagioli, A. Pecchini, I. Cipollini, P. Gatta. 2008

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AbstractThepresentstudywasperformedtodeterminetheef-fect of soybean meal (SBM) on the performance andguthistologyofgiltheadseabreamandEuropeanseabass. Three isonitrogenous and isolipidic extrudeddiets (crude protein, 470gkg 1 diet; crude fat,200g kg 1 diet) were formulated containing 0(0SBM), 180 (180SBM) and 300 (300SBM)gkg 1 diet SBM and tested on both species in two separateexperiments. Fish at an initial average weight ofaround18gwererandomlyallocatedto800Lsquaretanksconnectedtoaclosedrecirculatingsystem.Thetrialslasted80daysforseabreamand89daysforseabass. Fish were hand-fed to apparent satiation. In-creasing the level of SBM had no signi¢cant eiectsonthe speci¢cgrowth rate, feed intakeand feedcon-versionrateinboththespecies. Intheseabreamdis-tal intestine, lamina propria was moderately anddiiuselyexpanded in some ¢shduetoan increase incell in¢ltration represented by mononuclear cells,this ¢nding being more frequent in animals fed diet300SBM. No other morphological alterations in in-testinal folds, enterocytes or other in£ammationsigns were noticed in the sea bream distal intestineof any group. No histological diierences were foundinseabassinanyexperimentalgroup.Keywords: gilthead sea bream, European seabass, soybean meal, growth, gut histologyIntroductionCurrently, the importance of vegetable protein inaquaculture is well recognized by feed industry op-erators due to the growing pressure to ¢nd ¢sh meal(FM) substitutes in ¢sh diets. Among the diierentingredients, soybean meal (SBM) is one of the mostinterestingalternativeFMbecauseof theadvantagesof supply, price and protein and amino acid (AA)composition. On the other hand, the use of soybeanproducts may pose a series of problems that mayaiect palatability (Rackis 1974), protein digestibility(Glencross, Carter, Duijster, Evans, Dods, McCaierty,Hawkins, Maas & Sipsas 2004) and phosphorus bio-availability (Vielma, Makinen, Ekholm & Koskela2000), and may reduce feedutilization. Diierent ¢shspecieshaveshownvariablesensitivitytosoyantinu-tritional factors. In Atlantic salmon and rainbowtrout,SBMcausesimpairedgrowthandproteinutili-zation in addition to distinct morphological altera-tions in the intestine that become more pronouncedwith increasing dietary level (Krogdahl, Bakke-McKellep & Baeverfjord 2003). The morphologicalalterations are characterized by a widening of thelaminapropria,whichisin¢ltratedbyamixedpopula-tion of in£ammatory cells, and concurrent changesin enterocyte structure, including a decrease in oreven a loss of the supranuclear vacuoles present innormalenterocytes (Baeverfjord & Krogdahl1996), ashorteningof the microvilliand increased formation

Subfields: Aquatic Science, Immunology, Physiology

View Paper: https://www.semanticscholar.org/paper/c0e4ed517703366c27b858404a6dcd15bb0ad919

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In Aquatic Science

  1. L. Mydland
  2. F. Reveco
  3. M. Øverland
  4. O. Romarheim

In Immunology

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  2. F. Reveco
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In Physiology

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  2. M. Øverland
  3. O. Romarheim

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