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Journal of Applied Phycology

, Volume 26, Issue 4, pp 1833–1844 | Cite as

Comparative production and nutritional value of “sea grapes” — the tropical green seaweeds Caulerpa lentillifera and C. racemosa

  • Nicholas A. Paul
  • Nicolas Neveux
  • Marie Magnusson
  • Rocky de Nys
Article

Abstract

“Sea grapes” is a collective term for the edible varieties of the green seaweed genus Caulerpa. Here we conduct comparative analyses of the biomass productivities and biochemical properties of C. lentillifera and C. racemosa from tropical Australia. Commercial-scale production was evaluated using 1 m2 culture units with high stocking densities (>5 kg m−2). Productivity of C. lentillifera in a 6-week period yielded, on average, 2 kg week−1, whereas C. racemosa yielded <0.5 kg week−1. Morphometric comparisons of the harvestable biomass revealed that C. lentillifera had a higher proportion of fronds (edible portions) to horizontal runners (stolons) and a higher density of fronds per unit area. C. racemosa fronds, however, were significantly longer. The nutritional value of C. racemosa was higher than C. lentillifera for both polyunsaturated fatty acids (10.6 vs. 5.3 mg g−1 DW) and pigments (9.4 vs. 4.2 mg g−1 DW). The content of eicosapentaenoic acid (EPA) and β-carotene decreased with increasing frond size in both species. Trace element contents also varied substantially between the species, including higher levels of zinc, magnesium and strontium in C. lentillifera, and higher levels of selenium in C. racemosa. Some less desirable elements were higher in C. lentillifera, including arsenic (1 vs. 0.1 ppm) and cadmium, whereas others were higher in C. racemosa, including lead, copper and vanadium. Overall C. lentillifera has a high biomass production potential in monoculture and distinct nutritional properties that warrant a focus on its commercialisation as a new aquaculture product in tropical Australia and in Southeast Asia more broadly.

Keywords

Algae Aquaculture β-Carotene Minerals Nutrition Polyunsaturated fatty acids (PUFA) 

Notes

Acknowledgements

This research was funded by the Australian Flora Foundation. The authors thank I. Tuart (JCU) for assistance in production experiments and Y. Hu (Advanced Analytical Centre, JCU) for conducting the elemental analyses, and two anonymous reviewers for their input.

Supplementary material

10811_2013_227_MOESM1_ESM.doc (84 kb)
ESM 1 (DOC 84 kb)

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Nicholas A. Paul
    • 1
  • Nicolas Neveux
    • 1
  • Marie Magnusson
    • 1
  • Rocky de Nys
    • 1
  1. 1.MACRO — the Centre for Macroalgal Resources and Biotechnology, and School of Marine and Tropical BiologyJames Cook UniversityQueenslandAustralia

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