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Oleaginous yeast as a component in fish feed
Johanna Blomqvist1,2, Jana Pickova1, Sarvenaz Khalili Tilami3
1Swedish University of Agricultural Sciences, Department of Molecular Sciences, Box 7015, S-75007, Uppsala, Sweden.
Scientific Reports
|October 31, 2018
Summary
Vegetable oil (VO) in aquaculture feed for Arctic char can be replaced by yeast oil from lignocellulose. This sustainable alternative showed no significant differences in fish growth or health metrics.
Area of Science:
- Aquaculture nutrition
- Biotechnology
- Sustainable feed development
Background:
- Vegetable oil (VO) is a common, but increasingly unsustainable, replacement for fish oil in aquaculture feeds.
- VO is a limited resource with diverse applications, making its use in non-food sectors like aquaculture undesirable.
- Developing alternative lipid sources for aquaculture feed is crucial for sustainability and resource management.
Purpose of the Study:
- To investigate the efficacy of replacing VO with yeast oil from *Lipomyces starkeyi* in Arctic char (*Salvelinus alpinus*) feed.
- To assess the impact of yeast oil on key growth and physiological parameters in Arctic char.
- To evaluate the potential of lignocellulose-derived yeast oil as a sustainable aquaculture feed ingredient.
Main Methods:
- Cultivating the oleaginous yeast *Lipomyces starkeyi* on lignocellulose (wheat straw) hydrolysate.
- Mechanically disrupting yeast cells and incorporating the lipid-rich biomass into aquaculture feed.
- Comparing growth performance (weight gain, length gain, feed conversion ratio, specific growth rate) and physiological indices (condition factor, hepatosomatic index) between control and yeast oil groups.
Main Results:
- No significant differences were observed in weight gain, length gain, feed conversion ratio, specific growth rate, condition factor, or hepatosomatic index between Arctic char fed VO and those fed yeast oil.
- The fatty and amino acid profiles of the diets in both groups were comparable.
- Yeast oil from lignocellulose demonstrated comparable nutritional value to VO for Arctic char.
Conclusions:
- *Lipomyces starkeyi* yeast oil derived from lignocellulose is a viable and sustainable alternative to vegetable oil in Arctic char aquaculture feed.
- This approach offers a method to broaden raw material sources for feed production and valorize agricultural and forestry byproducts.
- The successful replacement of VO with yeast oil supports the development of more sustainable and circular aquaculture systems.
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