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Open AccessArticle

The Marine Fungi Rhodotorula sp. (Strain CNYC4007) as a Potential Feed Source for Fish Larvae Nutrition

1
Marine Biotechnology Unit, Department of Oceanography, Faculty of Natural and Oceanographic Sciences, Universidad de Concepción, Casilla 160-C, 4030000 Concepción, Chile
2
Center for Oceanographic Research COPAS Sur-Austral, Universidad de Concepción, Casilla 160-C, 4030000 Concepción, Chile
3
Doctoral Program in Aquatic Living Resources (MaReA), Faculty of Natural and Oceanographic Sciences, University of Concepción, Casilla 160-C, 4030000 Concepción, Chile
*
Author to whom correspondence should be addressed.
Mar. Drugs 2017, 15(12), 369; https://doi.org/10.3390/md15120369
Received: 31 August 2017 / Revised: 29 October 2017 / Accepted: 16 November 2017 / Published: 1 December 2017
(This article belongs to the Special Issue Marine Lipids 2017)
Fish oil is used in the production of feed for cultured fish owing to its high polyunsaturated fatty acid content (PUFA). The over-exploitation of fisheries and events like “El Niño” are reducing the fish oil supply. Some marine microorganisms are considered potentially as alternative fatty acid sources. This study assesses a strain of Rhodotorula sp. (strain CNYC4007; 27% docosahexaenoic acid (DHA) of total fatty acids), as feed for fish larvae. The total length and ribonucleic acid (RNA)/deoxyribonucleic acid (DNA) ratio of Danio rerio larvae was determined at first feeding at six and 12 days old (post-yolk absorption larvae). Larvae fed with microencapsulated Rhodotorula sp. CNYC4007 had a significantly higher RNA/DNA ratio than control group (C1). At six days post-yolk absorption group, the RNA/DNA ratio of larvae fed with Rhodotorula sp. bioencapsulated in Brachionus sp. was significantly higher than control group fed with a commercial diet high in DHA (C2-DHA). Finally, at 12 days post-yolk absorption, the RNA/DNA ratio was significantly higher in larvae fed with Rhodotorula sp. CNYC4007 and C2-DHA (both bioencapsulated in Artemia sp. nauplii) than in control group (C1). These results suggest that Rhodotorula sp. CNYC4007 can be an alternative source of DHA for feeding fish at larval stage, providing a sustainable source of fatty acids. View Full-Text
Keywords: Rhodotorula; DHA; EPA; Danio rerio; larvae nutrition; RNA/DNA ratio Rhodotorula; DHA; EPA; Danio rerio; larvae nutrition; RNA/DNA ratio
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Barra, M.; Llanos-Rivera, A.; Cruzat, F.; Pino-Maureira, N.; González-Saldía, R.R. The Marine Fungi Rhodotorula sp. (Strain CNYC4007) as a Potential Feed Source for Fish Larvae Nutrition. Mar. Drugs 2017, 15, 369.

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