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- Title
Effects of stocking density on the productivity and nutrient removal of Agarophyton vermiculophyllum in Paralichthys olivaceus biofloc effluent.
- Authors
Shin, Sook Kyung; Kim, Su-Kyoung; Kim, Jun-Hwan; Han, Taejun; Yarish, Charles; Kim, Jang K.
- Abstract
Optimal stocking density of the marine red alga Agarophyton vermiculophyllum was determined to maximize the productivity and nitrogen removal in biofloc effluent. Agarophyton vermiculophyllum was cultured at 0.2, 2, 4 and 8 g L−1 (FW) stocking densities, 160 ± 10 μmol photons m−2 s−1 and 12:12 L:D photoperiod for 20 days. Agarophyton vermiculophyllum was cultured in effluent from a juvenile Paralichthys biofloc tank culture system and von Stosch–enriched (VSE) medium at 20 °C. The total nitrogen and phosphorus concentration of VSE medium was adjusted to the biofloc level, 1000 μmol L−1 and 33 μmol L−1, respectively. Specific growth rate was significantly higher at 0.2, 2, 4 and 8 g L−1 in both media. However, the productivity was significantly higher at 8 than 0.2 g L−1 in both media. Tissue carbon contents were not significantly influenced by the medium at 8 g L−1 (34.9% in VSE and 34.0% in biofloc). However, tissue nitrogen content was significantly higher at VSE medium than at biofloc medium at 8 g L−1 (3.7% in VSE and 3.4% in biofloc). The carbon removal rate was highest at the highest stocking density, 1.98 mgC g−1 DW day−1 (VSE) and 1.89 mgC g−1 DW day−1 (biofloc), respectively. Also, the nitrogen removal rate was highest at the highest stocking density, 0.21 mgN g−1 DW day−1 (VSE) and 0.19 mgN g−1 DW day−1 (biofloc), respectively. The nutrient removal was not significantly influenced by medium at 4 and 8 g L−1. These results show that A. vermiculophyllum can grow and have the potential to remove nutrients in the biofloc medium at high nitrogen concentrations.
- Publication
Journal of Applied Phycology, 2020, Vol 32, Issue 4, p2605
- ISSN
0921-8971
- Publication type
Article
- DOI
10.1007/s10811-019-02014-1