Digestibility of the defatted microalgae Nannochloropsis sp. and Desmodesmus sp. when fed to Atlantic salmon, Salmo salar
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The aim of the study was to investigate the apparent digestibility coefficient (ADC) of defatted biomass derived from microalgae Nannochloropsis sp. and Desmodesmus sp. when fed to Atlantic salmon postsmolts in seawater. Two experiments, one employing cold-pelleted and the other employing extruded pellets, were carried out to determine the ADC of dry matter (DM), protein, ash and energy. The test feeds consisted of a fishmeal-based reference feed and the algal biomass, at a ratio of 70:30, and yttrium oxide as the inert marker. The ADC of DM and protein in fish fed microalgae-incorporated cold-pelleted feeds were significantly higher for Nannochloropsis sp. compared with Desmodesmus sp. The Nannochloropsis sp. inclusion in extruded feeds also led to higher ADCs of DM and energy compared with Desmodesmus sp. The extrusion processing significantly increased the ADC of ash in both defatted microalgae biomass, as well as ADCs of DM in Nannochloropsis and protein in Desmodesmus sp. In conclusion, the microalga Nannochloropsis sp. was more digestible than Desmodesmus sp., and extrusion processing can be used as a means to improve digestibility of certain nutrients.
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Protein digestibility of thick cellulosic cell-walled microalgal species including Chlorella sp., Desmodesmus sp., Nannochloropsis sp., and Tetraselmis sp. in aquatic species ranged 80-89%, 54-67%, 69-81%, and 70-73%, respectively.
“The protein digestibility of thick cellulosic cell-walled microalgal species including Chlorella sp., Desmodesmus sp., Nannochloropsis sp., and Tetraselmis sp. in aquatic species ranged 80-89%, 54-67%, 69-81%, and 70-73%, respectively (Gong et al., 2018;Moheimani et al., 2018;Niccolai et al., 2019;Skrede et al., 2011).”
From Potential of microalgae as a sustainable feed ingredient for aquaculture (2021) · cites this paper as Gong et al., 2018
Non-starch polysaccharides (fiber) found in microalgae are generally indigestible.
“Non-starch polysaccharides (fiber; e.g., pectin, algenan, cellulose, etc.,) found in microalgae are generally indigestible (Gong et al., 2018).”
From Potential of microalgae as a sustainable feed ingredient for aquaculture (2021) · cites this paper as Gong et al., 2018
In a study involving the feeding of Nannochloropsis sp. biomass to Atlantic salmon, extrusion processed feed was shown to be more digestible than non-extrusion processed feed in terms of ash and dry matter.
“In a study involving the feeding of Nannochloropsis sp.biomass to Atlantic salmon, S. salar, extrusion processed feed was shown to be more digestible than non-extrusion processed feed in terms of ash and dry matter (Gong et al., 2018).”
From Potential of microalgae as a sustainable feed ingredient for aquaculture (2021) · cites this paper as Gong et al., 2018
Extrusion can break the microalgae's recalcitrant cell wall, improving nutrient availability and digestibility.
“Extrusion can break the microalgae's recalcitrant cell wall, improving nutrient availability and digestibility (Gong et al., 2018).”
From Potential of microalgae as a sustainable feed ingredient for aquaculture (2021) · cites this paper as Gong et al., 2018
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- Authors
- Gong, Y., Guterres, H. A. D. S., Huntley, M., Sørensen, M., & Kiron, V.
- Affiliations
- Nord University (NO)
- Duke University (US)
- Corresponding author
- Sørensen, M.
- Venue
- Aquaculture Nutrition
- Publisher
- Wiley
- Published
- 2017-02-13
- Volume
- 24
- Issue
- 1
- Pages
- 56-64
- ISSN
- 1353-5773 (ISSN-L)
- OpenAlex
- W2587798117
- Cited by
- 87
- References
- 69
- Citations by year
- 2026: 10 · 2025: 9 · 2024: 5 · 2023: 8 · 2022: 12 · 2021: 10 · 2020: 14 · 2019: 12 · 2018: 3 · 2017: 4
- FWCI
- 10.43
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Aquaculture Nutrition (publishedVersion)
- OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
- NORA - Norwegian Open Research Archives (submittedVersion, other-oa)
- Funders
- US Department of Energy (DE- EE0003371)
- China Scholarship Council
- East China Sea Fisheries Research Institute
- Chinese Academy of Fishery Sciences
- The Royal Norwegian Embassy, Jakarta.
- Topics
- Life Sciences › Agricultural and Biological Sciences › Aquatic Science › Aquaculture Nutrition and Growth
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Algal biology and biofuel production
- Life Sciences › Immunology and Microbiology › Immunology › Aquaculture disease management and microbiota
- Keywords
- Nannochloropsis, Desmodesmus, Atlantic salmon, apparent digestibility coefficients, nutrient digestibility, extrusion, fish meal replacement
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