Partial replacement of fish oil by soybean oil on growth performance, survival and fatty acid metabolism in Persian Sturgeon (Acipenser persicus) fingerlings

Document Type : Physiology (Animal)

Authors

1 Artemia and Aquatics Research Institute, Urmia University, P.O.Box: 57153-165, Urmia, Iran

2 Department of Fisheries, Urmia Lake Research Institute, Urmia University, PO Box: 165

3 Department Of Animal science, faculty of Ariculture, Urmia University, P.O.Box: 57153-165, Urmia, Iran

Abstract

The aim of the study was to investigate the replacement of fish oil by soybean oil and the effects  on  the  growth  performance,  survival  and  fatty  acid  metabolism  in  Persian  sturgeon fingerlings. Three iso-nitrogenous and iso-lipidic experimental diets containing 100% fish oil, 50 and 100% soybean oil were fed to triplicate group of fingerlings (initial weight 210 g). No significant  difference  was  observed  in  the  case  of  weight  gain,  specific growth rate,  feed conversion ratio and survival (P > 0.05).  Fillet fatty acid composition was analyzed and the results  showed  that  fillet  fatty  acid  composition  was  highly  affected  by  dietary  fatty  acid profile  and  the  highest  accumulation  rate  of  linoleic  acid  (C18:2n6)  and  linolenic  acid (C18:3n3)  was  observed  in  100%  soybean  and  fish  oil  respectively.  Also  feeding  50% soybean oil stimulated elongation and desaturation pathway of C18 PUFA in fingerlings and the highest amount of EPA, DHA arachidonic acid (AA) was observed in this treatment. Data obtained  show  that  replacing  fish  oil  with  100%  soybean  oil  had  inhibitory  effect  on  the elongation and desaturation of C18 PUFA and the lowest amount of DHA and AA obtained in fingerlings fillet.  

Keywords

Journal of Animal Environment
Volume 5, Issue 2
September 2012
Pages 31-41

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