Journal of Applied Phycology

, Volume 28, Issue 5, pp 2865–2873 | Cite as

The yield and quality of multiple harvests of filamentous Ulva tepida

  • Christina Carl
  • Marie Magnusson
  • Nicholas A. Paul
  • Rocky de Nys
Article

Abstract

Species of the genus Ulva are used for human consumption due to their nutritional qualities and we assess a new filamentous species, Ulva tepida. A critical step is to quantify the yield and quality of biomass over multiple harvests to ensure consistency throughout the production cycle. To do this, ropes were seeded with U. tepida and harvested fortnightly over 6 weeks of outdoor cultivation with biomass yield and quality quantified for each harvest. This cycle was repeated a further two times. The yield of biomass was not significantly different between harvests (13.6–23.0 g dry weight (dw) m-1 rope), however, the final harvest was highly variable. Consequently, we recommend a production cycle of two harvests. The quality of biomass, as determined by the key biochemical parameters for these two sequential harvests, was consistent. Carbohydrates were the major component (45 % dw) and were primarily dietary fibre (27 % dw) consisting of insoluble (18 % dw) and soluble (9 % dw, equates to ulvan) fibre, with consistent values between harvests. Protein, as the sum of amino acids (17 % dw), was also consistent between harvests. Similarly, the content of ash (31 % dw) and lipids (3 % dw), as well as the composition of minerals and fatty acids was consistent. These results quantify, for the first time, no negative effects of multiple harvests on the yield and quality of biomass and support this technique to optimise productivity and quality.

Keywords

Macroalgae Aquaculture Nutritional composition Ulvan Aonori 

Notes

Acknowledgments

This research is part of the MBD Energy Research and Development programme for the Integrated Production of Macroalgae. Furthermore, this research was supported by a Queensland Accelerate Fellowship of C. Carl from the Queensland Government in conjunction with MBD Energy Limited and Pacific Reef Fisheries as industry co-sponsors. We thank M. Martinez, A. Ricketts, Z. Loffler, K. Darlington and B. Boer for assistance with experiments. We also thank K-L. Dyer, M. Azmi Wahab and N. Neveux for the assistance with the biochemical analysis. The amino acid profiling was facilitated using infrastructure provided by the Australian Government through the National Collaborative Research Infrastructure Strategy (NCRIS).

Supplementary material

10811_2016_831_MOESM1_ESM.docx (418 kb)
ESM 1 (DOCX 418 kb)

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Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  • Christina Carl
    • 1
  • Marie Magnusson
    • 1
  • Nicholas A. Paul
    • 1
  • Rocky de Nys
    • 1
  1. 1.MACRO – the Centre for Macroalgal Resources and Biotechnology, College of Marine and Environmental SciencesJames Cook UniversityTownsvilleAustralia

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