Effects of the partial substitution of fish meal by soy bean meal with or without mannanoligosaccharide and fructooligosaccharide on the growth and feed utilization of sharpsnout seabream,Diplodus puntazzo(Cetti, 1777): preliminary results

Abstract

The present study was carried out in order to investigate the effects of the mannanoligosaccharide (MOS) and fructooligosaccharide (FOS) on sharpsnout seabream, Diplodus puntazzo in the context of partial fish meal substitution by soybean meal. One-hundredforty-four sharpsnout seabream of about 100 g initial body weight were randomly divided in 12 experimental tanks (180 litre each). Testing conditions included 12 fish per tank, with triplicate tanks for treatment. The experimental period lasted 114 days. Average water temperature was 21.9±1.6°C, salinity was 30.0‰ and pH ranged from 7 to 8. Four isonitrogenousisolipidic diets were tested: a control diet (FM) with fish meal as the sole protein source; a second diet (SBM) with approximately 40% of the protein supplied by soybean meal. The remaining two diets were formulated adding 8 g of MOS and FOS per kg of the SBM diet respectively. Average final weight, specific growth rate, feed conversion ratio and protein efficiency ratio remained unaffected by partial fish meal substitution and by MOS or FOS supplementation. Also apparent digestibility coefficients values for organic matter, protein, lipid and energy were not significantly affected by dietary treatment.

Effects of Mannan Oligosaccharide and Inulin on Sharpsnout Seabream (Diplodus Puntazzo) in the Context of Partial Fish Meal Substitution by Soybean Meal

“…The present study demonstrated that dietary MOS or inulin did not significantly affect the growth performance of fish. This was also observed in the first part of the trial (Piccolo et al, 2011). Taking into account the SGR, it resulted obviously similar to the previous results.…”

“…The techniques used for larval rearing are the same as those used for Sparus aurata (Marangos, 1995) and relative high hatching and survival rates at first feeding permit obtaining appropriate percentage of juveniles . The results of research are quite encouraging, and indicate a considerable increase in sharpsnout seabream production in the near future (Orban et al, 2000;Hernàndez et al, 2001;Favaloro et al, 2002;Bonaldo et al, 2004;Piccolo et al, 2011).…”

“…However, the research of alternative proteins in diets for sharpsnout seabream conducted in recent years (Hernàndez et al, 2007;Chatzifotis et al, 2006;Nogales Merida et al, 2010) did not confirm this theory. The use of prebiotics could improve the sanitary status of the digestive system, increase the nutrient digestibility of vegetable feeds and thus permit a more easy replacement of fish meals.…”

“…The experiment presented in this paper represents the final phase of a trial whose preliminary results have been already published (Piccolo et al, 2011). Therefore, the experimental conditions have been already described.…”

“…After a period of adaptation (15 days), fish were randomly distributed in 12 fiberglass tanks (180 L each). The system was provided with thermostatic control and regulation of water temperature, mechanical sand-filter, biological filter and UV lamp apparatus and a constant and optimal environment quality was ensured to sharpsnout sea bream (daily water renewal=5%, artificial day length=12 h, temperature=21.9±1.6°C, salinity=30.0±2 g L -1 dissolved oxygen=6.4±1.5 mg L Piccolo et al (2011). Fish were daily hand-fed with two meals (9:00 and 16:00) to visual satiety (i.e.…”