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Abstract
The Danish marine aquaculture has, despite the huge potential, only been slowly increasing the last
25 years because of the imposed limits to the nitrogen (N) released to the environment. Mussels, seaweed
and other organisms have been successfully tested as biofilters in integrated multi-trophic aquaculture
(IMTA) worldwide, where nutrients emissions (especially N) from e.g. fish production are assimilated and
removed by valuable biomasses (crops; Fig.1). This IMTA production unit, and even spatial decoupling of
the biofilter organisms from the fish, have been recognized by the Danish national authorities in off-shore
fish farming. The bioremediation potential and yield of the “new” crop, seaweed (sugarkelp, Saccharina
latissima) was monitored in a commercial off-shore IMTA system year round at Hjarnø Havbrug fish farm
near Horsens. Furthermore, the year-round protein, amino acid, fatty acid, mineral and vitamin content
and profiles were monitored to evaluate the nutritional value and harvest time of the seaweed biomass.
Sugarkelp showed to be efficient for bioremediation of nitrogen, with environmental and potentially
economic benefits (e.g. waste water management and for production of valuable biomass). The seaweed
protein content varied throughout the experimental period with the highest values recorded in November
(14-20% of dry weight) and the lowest values recorded in May-July (2.8-6.7%). The lowest lipid content was
observed in July, while the highest values were observed in November (approx. 4% of dw), with EPA
(20:5(n-3)) and DHA (22:6(n-3)) accounting for 11.3-14.4% and 2.5-4.6% of total fatty acids, respectively.
This “new” Danish aquatic crop has potential applications. The harvest time should be settled around May
for human consumption and September in order to achieve maximum biofiltration efficiency with
harvested biomass for feed utilization. This considering both biology/life cycle, biofouling and yield, which
may compromise with seasons with higher nutritional value of the produced biomass.
Original language | English |
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Title of host publication | Abstract Book - DTU Sustain Conference 2014 |
Number of pages | 1 |
Place of Publication | Kgs. Lyngby |
Publisher | Technical University of Denmark |
Publication date | 2014 |
Publication status | Published - 2014 |
Event | DTU Sustain Conference 2014 - Technical University of Denmark, Lyngby, Denmark Duration: 17 Dec 2014 → 17 Dec 2014 http://www.sustain.dtu.dk/ |
Conference
Conference | DTU Sustain Conference 2014 |
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Location | Technical University of Denmark |
Country/Territory | Denmark |
City | Lyngby |
Period | 17/12/2014 → 17/12/2014 |
Internet address |
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Dive into the research topics of 'Integrated multi-trophic aquaculture (combined production of fish, mussels and seaweed)'. Together they form a unique fingerprint.Activities
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DTU Sustain Conference 2014
Holdt, S. L. (Speaker)
17 Dec 2014Activity: Talks and presentations › Conference presentations
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