Fountoulaki, E.

Grigorakis, K

Kogiannou, D.

Kousoulaki, Katerina

Mente, E.

Nengas, I.

Pyrenis, G

Samuelsen, Tor Andreas

Vasilaki, A.

English

NOFIMA Repository

1571EFFECTS OF NOVEL INGREDIENTS ON GROWTH PERFORMANCE IN EUROPEAN SEA BASS, Dicentrarchus labrax A. Vasilakia*, K. Kousoulakic, T.A. Samuelsenc, G. Pyrenisa, D. Kogiannoua, K. Grigorakisa, E. Fountoulakia,E. Menteb and I. Nengasaa.Institute of Marine Biology, Biotechnology & Aquaculture, Hellenic Center for Marine Research, AghiosKosmas, 16777 Hellinikon, Athens, Greeceb. School of Agricultural Science, Department of Ichthyology and AquaticEnvironment, University of Thessaly, 38446 Volos, Greecec.Nofima AS, Feed Technology Centre, Kjerreidviken 16, N-5141 Fyllingsdalen, NorwayE-mail: avasilaki@hcmr.grIntroductionLimited availability of ingredients in aquaculture feeds is crucial in order to maintain the increasing demands of aquaculture industry Gamboa‐Delgado & Márquez‐Reyes 2018). However, to safeguard sustainable exploitation of natural resources, the use of capture fisheries-based fishmeal and fish oil needs to be reduced in conventional fish feeds (Tacon & Metian, 2015). Accordingly sources with high quality protein and essential nutrients are imperative need otherwise fish performance (Kousoulaki et al., 2012), health status and final product quality (Kousoulaki et al., 2016) may be jeopardized when substituting dietary fish meal by alternative ingredients of lower nutritional value. The main objective of this study is to test ingredients and design formulations for commercially relevant tailored-made aqua feeds, ensuring high performance, maintaining or enhancing nutritional value and environmental friendliness.Materials and methodsTen experimental feed mixes were prepared (Table I). The levels of conventional and trimmings fish meal and oil and that of the novel feed ingredients, balanced to same proximate composition, EPA+DHA and total phospholipid content with rapeseed or fish oil, soy lecithin, wheat and wheat gluten, were predetermined by a chosen range in the applied three component mixture design. Juvenile European sea bass of an initial average body weight of 5.72±0.72g were fed the experimental diets. Fish were weighted individually at the beginning and end of the experimental trial under mid anesthesia with clove oil. Fish were fed at libitum twice a day. Mortalities and feed consumption were recorded daily in order to be able to evaluate accurately values for feed utilization (FCR, SGR, % daily feed consumption). Results and DiscussionThe results so far show that there is a significantly positive effect in sea bass performance of moderate dietary inclusion of innovative ingredients in the presence of minimum 10% conventional fish meal and 2.7% conventional fish oil. The inclusion of fish trimmings at any level had negative effect on fish performance. In the absence of any kind of fish meal, and the highest inclusion level of bacterial, yeast, microalgae and sunflower meal, feed intake was lowest (Figure 1- able II).AcknowledgementThis project has received funding from the European Union’s Horizon 2020 Innovation Action, FutureEUAqua, under grant agreement No 817737.This output reflects the views only of the author(s), and the European Union cannot be held responsible for any use which may be made of the information contained therein.ReferencesGamboa‐Delgado, J., and Márquez‐Reyes, J. M. 2018. Potential of microbial‐derived nutrients for aquaculture development. Reviews in Aquaculture 10(1): 224-246.Kousoulaki, K., Olsen, H. J., Albrektsen, S., Langmyhr, E., Mjøs, S. A., Campbell, P., and Aksnes, A. 2012. High growth rates in Atlantic salmon (Salmo salar L.) fed 7.5% fish meal in the diet. Micro-, ultra-and nano-filtration of stickwater and effects of different fractions and compounds on pellet quality and fish performance. Aquaculture, 338: 134-146.Kousoulaki, K., Mørkøre, T., Nengas, I., Berge, R. K. and Sweetman, J. 2016. Microalgae and organic minerals enhance lipid retention efficiency and fillet quality i Atlantic salmon (Salmo salar L.).Aquaculture, 451: 47-57.Tacon, A. G., and Metian, M. 2015. Feed matters: satisfying the feed demand of aquaculture. Reviews in Fisheries Science & Aquaculture, 23(1): 1-10.(Continued on next page)1572

Effects of novel ingredients on growth performance in european sea bass, dicentrarchus labrax

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Effects of novel ingredients on growth performance in european sea bass, dicentrarchus labrax

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