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Growth, survival and fatty acids profile of sea urchins, Paracentrotus lividus juveniles fed with Ulva spp. and maize in aquaculture production. First results using G1 generation in Portugal


Journal of Aquaculture & Marine Biology
Candeias-Mendes A,1 Araújo J,1 Santos M,4 Namora M,4 Soares F,1 Gomes R,2 Cardoso C,2,3 Afonso C,2,3 Bandarra NM,2,3 Pousão-Ferreira P1

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Abstract

Sea urchins are a marine resource whose value and demand presents a growing trend, the objective of this work was to evaluate growth and survival in aquaculture produced (G1) juveniles fed with two different diets and trying to stablish a protocol for a feasible production of P. lividus. A nutritional trial was defined to evaluate two different feeding protocols in G1 (captivity born) juveniles were fed for 4 months, September 2017 - January 2018) with two diets: diet A - macroalgae (Ulva spp.); diet M+A - 25 % of maize grains+ 75% of macroalgae (Ulva spp.) w/w. Alternative dietary solutions for P. lividus were shown to be viable, survival was 100% and juvenile growth, quite similar for the two treatments presented very good rate 2.25 and 2.13%. At the end of trial juvenile sea urchin presented already gonad differentiation, what was not expected in individuals of that class size 1.85 and 1.78 for diet A and M+A. FA profiles largely reflect the diets, macroalgae-based diet enabled a higher w3/w6 ratio. In this context, it is highly positive the revealed potential of this species to self-synthesize long chain PUFA (with 20 carbons) by incorporation of precursors (C16 and C18) of these FA directly from diet (either macroalgae-based only or in maize+macroalgae-based). Namely, EPA, an anti-inflammatory bioactive FA, was shown to be enriched in the gonads of sea urchins. This work evidence the need to develop a specific diet that may enhance somatic growth in detriment of gonad growth, avoiding gametogenesis in such young/smaller individuals. 

Keywords

sea urchin rearing, Paracentrotus lividus, feeding table, fatty acid profile, ulva spp, valorized, echino culture, macroalgae, eicosapentaenoic acid, docosahexaenoic acid ,

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