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Testing the yield of a pilot‐scale bubble column photobioreactor for cultivation of the microalga Rhodomonas salina as feed for intensive calanoid copepod cultures
Author(s) -
Vu Minh Thi Thuy,
Jepsen Per Meyer,
Jørgensen Niels O. G.,
Hansen Benni Winding,
Nielsen Søren Laurentius
Publication year - 2019
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.13868
Subject(s) - photobioreactor , copepod , biology , algae , acartia tonsa , botany , dilution , zoology , food science , crustacean , ecology , biomass (ecology) , physics , thermodynamics
A dual column photobioreactor (PBR) (2 × 47 L) with mixed CO 2 /air bubbling was tested for cultivation of the microalga Rhodomonas salina as food for live feed copepods. In the continuous growth phase, the cell density was relatively stable at 2.40 ± 0.13 × 10 6 cells/ml at an average dilution rate of 0.46 ± 0.02 per day throughout the 30‐day experiment. The produced algae had a high content of both total fatty acids (TFA) and free amino acids (FAA). Especially, the harvested algae contained a high proportion of poly‐unsaturated fatty acids that made up 80% of the TFA and of essential amino acids (35% of all FAA), implicating desirable components as feed for copepods. The current PBR was sufficient to feed a culture of the calanoid copepod Acartia tonsa at a density of 2,500 adult/L in ca . 500 L culture with a daily yield of approximately 17 × 10 6 eggs. To be able to sustain the integrated copepods production, the suggested volume of the algae cultures should be ca . 20% of the copepod culture volume.