Abstract
Rhodomonas sp. Hf-1 is a marine microalgal strain with a high nutritional value. In order to produce this microalga effectively and inexpensively in a hatchery, its production protocol was reexamined through several culture trials. Firstly, it was found that the Hf-1 strain required nitrogen, phosphorus, iron, manganese and vitamin B12. The optimal nitrogen source was urea. Based on these results, a new medium, MU–SW, was formulated from agricultural fertilizers. Secondly, MU–SW medium was verified at production scale, in which satisfactory growth of the Hf-1 strain was obtained. The cell density reached approximately 3.0 × 106 cells ml−1, and five harvest cycles at 4-day intervals could be achieved. The high unsaturated fatty acid content of the harvested cells fluctuated in the following ranges: C18:2n-6, 19.8–25.2%; C18:3n-6, 8.7–15.2%; C20:4n-6, 2.0–4.6%; C20:5n-3, 8.2–11.3% and C22:6n-3, 5.6–7.3%. This study provides the baseline conditions for introducing the Hf-1 strain into an aquaculture food chain.
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Acknowledgements
We would like to thank Mr. Albert Manuel for linguistic assistance, and all members of the laboratory of Shallow Sea Aquaculture at Mie University for their kind assistance and support. We are grateful to the laboratory of the Aquaculture & Artemia Reference Center for their support and suggestions which helped to improve the manuscript. This work was supported by the Japan Public–Private Partnership Student Study Abroad Program (TOBITATE).
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Yamamoto, S., Yamato, R., Aritaki, Y. et al. Development of a culture protocol for Rhodomonas sp. Hf-1 strain through laboratory trials. Fish Sci 85, 695–703 (2019). https://doi.org/10.1007/s12562-019-01325-z
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DOI: https://doi.org/10.1007/s12562-019-01325-z