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Partially replacing fish oil with microalgae ( Schizochytrium limacinum and Nannochloropsis oceanica ) in diets for rainbow trout ( Oncorhynchus mykiss ) reared in saltwater with reference to growth performance, muscle fatty acid composition and liver ultrastructure

2021; Wiley; Volume: 52; Issue: 9 Linguagem: Inglês

10.1111/are.15279

1365-2109

Edison Serrano, Robert Simpfendörfer, Alberto Medina, Carlos Sandoval, Alexis Martínez, R. Morales, Simon J. Davies,

Aquatic life and conservation

Aquaculture ResearchVolume 52, Issue 9 p. 4401-4413 ORIGINAL ARTICLE Partially replacing fish oil with microalgae (Schizochytrium limacinum and Nannochloropsis oceanica) in diets for rainbow trout (Oncorhynchus mykiss) reared in saltwater with reference to growth performance, muscle fatty acid composition and liver ultrastructure Edison Serrano, Corresponding Author edison.serrano@uda.cl orcid.org/0000-0003-1053-4885 Departamento de Acuicultura y Recursos Agroalimentarios, Universidad de los Lagos, Osorno, Chile Centro de Investigaciones Costeras, Universidad de Atacama, Copiapo, Chile Correspondence Edison Serrano, Centro de Investigaciones Costeras, Universidad de Atacama, Avenida Copayapu 485, C.P. 1531772, Copiapó, Chile. Email: edison.serrano@uda.clSearch for more papers by this authorRobert Simpfendorfer, Departamento de Acuicultura y Recursos Agroalimentarios, Universidad de los Lagos, Osorno, Chile Área prioritaria de Investigación (API-2) ‘Acuicultura Sustentable’, Universidad de Los Lagos, Osorno, ChileSearch for more papers by this authorAlberto Medina, Departamento de Acuicultura y Recursos Agroalimentarios, Universidad de los Lagos, Osorno, Chile Área prioritaria de Investigación (API-2) ‘Acuicultura Sustentable’, Universidad de Los Lagos, Osorno, ChileSearch for more papers by this authorCarlos Sandoval, Veterinary Histopathology Center, Puerto Montt, ChileSearch for more papers by this authorAlexis Martínez, Antares Laboratory, Puerto Montt, ChileSearch for more papers by this authorRodrigo Morales, Instituto de Investigaciones Agropecuarias, INIA-Remehue, Osorno, ChileSearch for more papers by this authorSimon J. Davies, orcid.org/0000-0002-4483-0503 Department of Animal Production, Welfare and Veterinary Sciences, Harper Adams University, Newport, UKSearch for more papers by this author Edison Serrano, Corresponding Author edison.serrano@uda.cl orcid.org/0000-0003-1053-4885 Departamento de Acuicultura y Recursos Agroalimentarios, Universidad de los Lagos, Osorno, Chile Centro de Investigaciones Costeras, Universidad de Atacama, Copiapo, Chile Correspondence Edison Serrano, Centro de Investigaciones Costeras, Universidad de Atacama, Avenida Copayapu 485, C.P. 1531772, Copiapó, Chile. Email: edison.serrano@uda.clSearch for more papers by this authorRobert Simpfendorfer, Departamento de Acuicultura y Recursos Agroalimentarios, Universidad de los Lagos, Osorno, Chile Área prioritaria de Investigación (API-2) ‘Acuicultura Sustentable’, Universidad de Los Lagos, Osorno, ChileSearch for more papers by this authorAlberto Medina, Departamento de Acuicultura y Recursos Agroalimentarios, Universidad de los Lagos, Osorno, Chile Área prioritaria de Investigación (API-2) ‘Acuicultura Sustentable’, Universidad de Los Lagos, Osorno, ChileSearch for more papers by this authorCarlos Sandoval, Veterinary Histopathology Center, Puerto Montt, ChileSearch for more papers by this authorAlexis Martínez, Antares Laboratory, Puerto Montt, ChileSearch for more papers by this authorRodrigo Morales, Instituto de Investigaciones Agropecuarias, INIA-Remehue, Osorno, ChileSearch for more papers by this authorSimon J. Davies, orcid.org/0000-0002-4483-0503 Department of Animal Production, Welfare and Veterinary Sciences, Harper Adams University, Newport, UKSearch for more papers by this author First published: 27 April 2021 https://doi.org/10.1111/are.15279Citations: 1Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinked InRedditWechat Abstract The effect of dietary inclusion of a mixture of microalgae meal (Schizochytrium limacinum and Nannochloropsis oceanica) (1:1 ratio) on growth performance, gene expression, histology and muscle fatty acid composition of rainbow trout (Oncorhynchus mykiss) reared in saltwater was investigated. Three experimental extruded diets containing 0%, 9% and 17% of a mixture of microalgae meal were evaluated in triplicate groups during 10-week bioassay. The results showed that growth performance and feed conversion ratio were significantly reduced by increasing the dietary inclusion of a mixture of microalgae meal. No significant trends were observed with respect to feed intake and relative gene expression of hsp70, scarb1, IL-12 and myod. Conversely, increasing dietary levels of a mixture of microalgae meal led to a decrease in vacuolar degeneration of hepatocytes. A reduction of 23% on the amount of 20:5n−3 fatty acid in the muscle was found between the fish fed control and the highest level of the microalgae meal blend diets. Nevertheless, 22:6n−3 fatty acid content did not vary among dietary treatments. These results demonstrate that a mixture of microalgae meal has a potential to be included up to 90 g kg−1 within diets for rainbow trout as a sustainable replacement for fish oil. Open Research DATA AVAILABILITY STATEMENT The data supporting the findings of this study are available from the corresponding author upon reasonable request. Citing Literature Volume52, Issue9September 2021Pages 4401-4413 RelatedInformation