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dc.contributor.authorSantos, Andrées_ES
dc.contributor.authorPinto, Wilsones_ES
dc.contributor.authorGrenha, Anaes_ES
dc.contributor.authorDias, Jorgees_ES
dc.contributor.authorEngrola, Sofíaes_ES
dc.contributor.authorIzquierdo, Marisoles_ES
dc.contributor.authorYúfera, Manueles_ES
dc.contributor.authorConceição, L. E. C.es_ES
dc.identifier.citationIV International Meeting on Marine Research (2014)es_ES
dc.descriptionTrabajo presentado en la IV International Meeting on Marine Research (IMMR 2014), celebrada en Peniche (Portugal) el 10 y 11 de julio de 2014.es_ES
dc.description.abstractThe improvement of micro diets, for fish larvae, has been a major challenge in past years; however some problems remain without a resolution. Besides its tremendous growth rates, at early developmental stages, fish larvae present an immature digestive system and a progressive metamorphic process that suggest special nutritional requirements. It is therefore essential to provide fish larvae with easy and/or quickly metabolized protein sources, like protein hydrolisates, high bioavailable forms of vitamins and trace minerals. The low molecular weight of such compounds, in association to the high surface area of the micro-particles, makes them highly soluble and prone to water leaching losses. These nutrient losses, not only makes these nutrients unavailable to the larvae, but originate an important increase of organic matter in the rearing tanks, leading to detrimental water quality criteria. The development of high-performing micro-particulate diets for fish larvae requires a delicate balance between an adequate quantitative and qualitative nutritional supply and good water stability of the feeds, without compromising the palatability and the digestive breakdown. A series of binders, protein-based (e.g. fish gelatin, wheat gluten, spray-dried plasma) and carbohydrate-based (gums, alginates, pectins, starches, dextrin, polyols) were incorporated at graded levels (1, 2.5 and 5%) in a standard formulation for seabream larvae. Diets were manufactured by a proprietary low-shear extrusion process and afterwards processed to obtain a 200-400 micron fraction. All diets were analyzed for the following criteria: water leaching of nitrogenous compounds, turbidimetry and particle water stability. An additionally approach relied on the use of various encapsulation techniques (spray-drying, fluid-bed drying and vacuum coating) to incorporate trace minerals (Zn and Mn) and amino acids (taurine, lysine and methionine). Technological results show that the beneficial effects towards nutrient leaching and physical stability of the micro-pellets after immersion in water are highly dependent on binder type and less markedly on binder dose. Through the use of selected binders (e.g. guar gum and gelatin) in association to a spray-drying encapsulation process, we were able to significantly alter the release profile of Zn, Mn and taurine. Some of these prototypes were also tested in vivo with gilthead seabream larvae and clearly suggest that microencapsulation technologies that allow a controlled release profile of nutrients result in beneficial effects to larval growth and quality criteria. The results of several specific scenarios will be presented.es_ES
dc.description.sponsorshipThis work has been partly funded under projects 13380-MICALA and 23000-ZEBRAFEEDS co-financed by FEDER through PO Algarve 21 in the framework of QREN 2007-2013, and by the EU seventh Framework Programme by the ARRAINA project No. 288925: Advanced Research Initiatives for Nutrition & Aquaculture.es_ES
dc.subjectFish larvae-
dc.subjectEncapsulation technologies-
dc.subjectControlled release-
dc.titleEffect of different binders and encapsulation techniques in the structure and functional properties of microdiets for fish larvaees_ES
dc.typecomunicación de congresoes_ES
dc.description.peerreviewedPeer reviewedes_ES
dc.contributor.funderEuropean Commissiones_ES
oprm.item.hasRevisionno ko 0 false*
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