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Cited by 33Aquaculture Nutrition and GrowthAquaculture disease management and microbiotaAlgal biology and biofuel production

Fish welfare, fast muscle cellularity, fatty acid and body-composition of juvenile spotted wolffish (Anarhichas minor) fed a combination of plant proteins and microalgae (Nannochloropsis oceanica)

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Knutsen, H.R., Johnsen, I.H., Keizer, S., Sørensen, M., Roques, J.A.C., Hedén, I., Sundell, K., Hagen, Ø.·2019·Aquaculture
DOI 10.1016/j.aquaculture.2019.03.043
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Abstract

Spotted wolffish (Anarhichas minor) is a promising candidate for diversification of cold-water aquaculture. An increased knowledgebase is needed concerning the capacity of spotted wolffish to utilize a variety of feed ingredients such as microalgae and terrestrial plants. The aim of the study was therefore to investigate the effect of incorporating graded levels of microalgae (Nannochloropsis oceanica) on fish welfare indicators (growth, hepasomatic index, hematological parameters), fast muscle cellularity, chemical and fatty acid composition. Three isonitrogenous and isocaloric diets were formulated; one control diet (0% N. oceanica) and two diets with low (7.5% N. oceanica) and high (15% N. oceanica) levels of microalgae replacing fishmeal and wheat in the diets. After 12 weeks of feeding, the fish showed low growth compared to previous wolffish studies (0.26% SGR). However, this effect was not treatment dependent as there were no differences in growth or fast muscle cellularity among the three treatment groups and hematological parameters showed no indications of stress in the fish fed microalgae. Hepatosomatic index decreased over the course of the experiment for all treatment groups; a significantly larger reduction was noted in the algae-fed fish compared to the control. The omega-3 fatty acid EPA increased in the whole body of the fish fed diets containing microalgae. The results suggest that spotted wolffish has potential to utilize inclusions of up to 15% of the microalgae N. oceanica.

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Authors
Knutsen, H. R., Johnsen, I. H., Keizer, S., Sørensen, M., Roques, J. A. C., Hedén, I., Sundell, K., & Hagen, Ø.
Affiliations
  • Nord University (NO)
  • University of Gothenburg (SE)
Corresponding author
Hagen, Ø.
ORCID
Venue
Aquaculture
Publisher
Elsevier BV
Published
2019-05
Volume
506
Pages
212-223
ISSN
0044-8486 (ISSN-L)
DOI
10.1016/j.aquaculture.2019.03.043
OpenAlex
W2924827115
Cited by
33
References
3
Citations by year
2026: 3 · 2025: 4 · 2024: 5 · 2023: 7 · 2022: 2 · 2021: 9 · 2020: 3
FWCI
3.12
Type
journal article
Language
en
Open access
Licence
Locations
Aquaculture (publishedVersion, cc-by-nc-nd)
Funders
  • Stiftelsen för Miljöstrategisk Forskning
  • Svenska Forskningsrådet Formas
Topics
  • Life Sciences › Agricultural and Biological Sciences › Aquatic Science › Aquaculture Nutrition and Growth
  • Life Sciences › Immunology and Microbiology › Immunology › Aquaculture disease management and microbiota
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Algal biology and biofuel production
Keywords
spotted wolffish, Anarhichas minor, Nannochloropsis oceanica, microalgae, plant proteins, fish meal replacement, fish welfare, growth performance, hematological parameters, fatty acid composition, EPA, body composition, cold-water aquaculture, juvenile fish

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

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