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Apparent nutrient and fatty acid digestibilities of microbial raw materials for rainbow trout (Oncorhynchus mykiss) with comparison to conventional ingredients

Apparent nutrient and fatty acid digestibilities of microbial raw materials for rainbow trout (Oncorhynchus mykiss) with comparison to conventional ingredients

Kategori
Tidsskriftspublikasjon
Sammendrag
Determination of apparent digestibility coefficients (ADC) of ingredients has a central importance in formulation of aquaculture diets. Heterotrophic and phototrophic grown microalgae are considered as one of the best eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA) as well as protein alternatives for fish oil and fish meal (FM) to sustain further growth in aquaculture production. This study aimed to determine nutrient and fatty acid ADCs of microbial materials including Nannochloropsis oceanica, Phaeodactylum tricornutum and two thraustochytrid strains (T29 and T66) with comparison to commonly used ingredients such as two batches of FMs, poultry-by product meal (PBM), soybean meal (SBM), corn gluten meal (CGM), wheat gluten meal (WGM) and whole wheat flour (WF) in rainbow trout, Oncorhynchus mykiss. Each ingredient was tested using Cr2O3 as an indigestible marker in triplicated cylindro-conical tanks for 2 weeks. Protein ADCs of microbial ingredients ranged between 77.6% in T66 and 84.4% in P. tricornutum and were close to those of FMs and PBM. N. oceanica had generally significantly lower lipid and fatty acid ADCs than those of P. tricornutum, thraustochytrids and the conventional feed ingredients probably due to their thick cell walls. Between the thraustochytrids strains, the T66 appeared to have slightly lower lipid, energy, organic matter, saturated, monounsaturated, long chain n-6 and long chain n-3 fatty acid ADCs than T29. P. tricornutum showed comparable nutrient ADC values to the two FMs used in the study. The results suggest that even if the microbial ingredients were used at 30% in reference diet without exposition to a pretreatment process, they can be utilized at acceptable rates by rainbow trout.
Oppdragsgiver
  • EC/FP7 / 321553
Språk
Engelsk
Forfatter(e)
  • Sevgili Huseyin
  • Sezen Soner
  • Yılayaz Adil
  • Aktas Ozgur
  • Pak Faruk
  • Aasen Inga Marie
  • Reitan Kjell Inge
  • Sandmann Michael
  • Rohn Sascha
  • Turan Gamze
  • Kanyılmaz Mahir
Institusjon(er)
  • Tyrkia
  • SINTEF Industri / Bioteknologi og nanomedisin
  • Norges teknisk-naturvitenskapelige universitet
  • Tyskland
  • Ege Üniversitesi
År
2019
Publisert i
Algal Research
ISSN
2211-9264
Årgang
42
Side(r)
1 - 10