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Glavni cilj ovog istraživanja je testirati učinak standardne komercijalne hrane (Skretting Active ZA) na rast mladog Argyrosomus japonicas u usporedbi s istom hranom dopunjenom sa šest komercijalno dostupnih aditiva kroz period od 10 tjedana. Zajednički dodatak tretmanima sastojao se od dva soja kvasaca (84% Candida utilis i 16% Saccharomyces cervesiae) te je činio 33% ukupne mase hrane. Ishrana kvascima testirana je i per se kao bazna eksperimentalna hrana (Base experimental diet - BED). U ostalih pet eksperimentalnih ispitivanja, BED je miješan s odabranim biljnim ekstraktima ili farmaceutskim probioticima kako bi se usporedno mjerilo povećanje preklapajućeg rasta. Korišteni biljni ekstrakti su Aquapro® (biljni prah), Liv-Up® (biljne granule) i UNBP-20® (tekućina). Korišten je dvosojni probiotik Probiflora® (Lactobacillus acidophilus i Bifidobacterium bifidus). Eksperimentalna ishrana usko je odražavala usporedne približne hranjive vrijednosti sadržaja proteina (46-48%), ugljikohidrata (17-18%), masnoća (~14%) te vlakana (11-12%). Mladi Argyrosomus japonicas (n = 50 po akvariju) od približno 5,77±1,28 g eksperimentalno su uzgajani u akvarijima (465 L) odgovarajućeg recirkulacijskog akvakulturnog sustava (RAS) (24-25°C) tijekom 10 tjedana, na prirodnoj svjetlosti. Nadopuna prehrani inducirala je značajan prosječni rast tijela od 43,3 g, osim sporijeg rasta (P<0,05) izmjerenog na ispitivanjima s tekućim aditivom Liv-Up®. Stopa održivog rasta jednaka je između BED i kompleksa s već spomenutim aditivima. Isto tako je BED (46,5% proteina) uzrokovao pojačanu stopu održivog rasta (P<0,05) od kontrolne ishrane bez kvasaca (50% proteina). Najbolji FCR (0,95) postignut je s BED-om kojem je dodan biljni proizvod UNBP-20®. Dodatak neaktivnih sojeva kvasaca preporuča se u komercijalnoj prehrani Argyrosomus japonicas, obzirom da uzrokuje pojačanu stopu rasta i moguću proizvodnu održivost.The main objective of this investigation was to test the effect of a standard commercial feed (Skretting Active ZA) on the growth performance of juvenile dusky kob (Argyrosomus japonicus), compared to the same feed when supplemented with six commercially available additives over a period of 10 weeks. A common additive in trial treatments contained two yeast strains (84% Candida utilis and 16% Saccharomyces cerevisiae) that were incorporated at 33% of the total feed mass. The yeast combined diet was also tested per se as a base experimental diet (BED). In the remaining five trials the BED was respectively mixed with selected herbal extracts or pharmaceutical probiotics to comparatively measure possible superimposed growth enhancement. Herbal extracts were Aquapro® (herbal powder), Liv-Up® (herbal granule), Liv-Up® (liquid) and UNBP-20® (liquid). The pharmaceutical 2-strain probiotic was Probiflora® (Lactobacillus acidophilus and Bifidobacterium bifidus). Experimental diets closely reflected comparative approximate nutrient values with respect to protein (46-48%), carbohydrate (17-18%), fat (~14%) and fibre (11-12%) content. Juvenile dusky kob (n=50 per tank) of about 5.77±1.28 g were experimentally grown for 10 weeks in tanks (465 L) of a suitable recirculating aquaculture system (RAS) (24-25°C) with natural lighting. Supplement added diets induced a substantial average body growth of 43.3 g, except for slower (P<0.05) growth measured for the Live-Up®-liquid additive trial. The SGR was of the same magnitude between the BED and its complex with the mentioned additives. Also, the BED (46.5% protein) mediated a faster SGR (P<0.05) than the control diet without yeast (50% protein). The best FCR (0.95) was achieved with the BED added herbal product UN-BP20®. The dietary inclusion of the inactivated yeast types is recommended for dusky kob commercial diets since it showed enhanced growth performance and possible production viability

croatian journal of fisheries/ribarstvo

The effect of commercial feed supplemented with selected yeast, probiotics and herbal additives on the growth performance of juvenile dusky kob (<i>Argyrosomus japonicus</i>).

The effect of commercial feed supplemented with selected yeast, probiotics and herbal additives on the growth performance of juvenile dusky kob (Argyrosomus japonicus).