The seeding and cultivation of a tropical species of filamentous ulva for algal biomass production

Carl, Christina, de Nys, Rocky, and Paul, Nicholas A. (2014) The seeding and cultivation of a tropical species of filamentous ulva for algal biomass production. PLoS ONE, 9 (6). e98700. pp. 1-9.

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Filamentous species of Ulva are ideal for cultivation because they are robust with high growth rates and maintained across a broad range of environments. Temperate species of filamentous Ulva are commercially cultivated on nets which can be artificially 'seeded' under controlled conditions allowing for a high level of control over seeding density and consequently biomass production. This study quantified for the first time the seeding and culture cycle of a tropical species of filamentous Ulva (Ulva sp. 3) and identified seeding density and nursery period as key factors affecting growth and biomass yield. A seeding density of 621,000 swarmers m-1 rope in combination with a nursery period of five days resulted in the highest growth rate and correspondingly the highest biomass yield. A nursery period of five days was optimal with up to six times the biomass yield compared to ropes under either shorter or longer nursery periods. These combined parameters of seeding density and nursery period resulted in a specific growth rate of more than 65% day−1 between 7 and 10 days of outdoor cultivation post-nursery. This was followed by a decrease in growth through to 25 days. This study also demonstrated that the timing of harvest is critical as the maximum biomass yield of 23.0±8.8 g dry weight m−1 (228.7±115.4 g fresh weight m−1) was achieved after 13 days of outdoor cultivation whereas biomass degraded to 15.5±7.3 g dry weight m−1 (120.2±71.8 g fresh weight m−1) over a longer outdoor cultivation period of 25 days. Artificially seeded ropes of Ulva with high biomass yields over short culture cycles may therefore be an alternative to unattached cultivation in integrated pond-based aquaculture systems.

Item ID: 33576
Item Type: Article (Research - C1)
ISSN: 1932-6203
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© 2014 Carl et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

Funders: Australian Government, Australian Renewable Energy Agency (ARENA), Advanced Manufacturing Cooperative Research Centre (AMCRC)
Date Deposited: 06 Jun 2014 03:01
FoR Codes: 06 BIOLOGICAL SCIENCES > 0607 Plant Biology > 060701 Phycology (incl Marine Grasses) @ 15%
07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070401 Aquaculture @ 35%
10 TECHNOLOGY > 1002 Environmental Biotechnology > 100203 Bioremediation @ 50%
SEO Codes: 85 ENERGY > 8505 Renewable Energy > 850501 Biofuel (Biomass) Energy @ 40%
82 PLANT PRODUCTION AND PLANT PRIMARY PRODUCTS > 8203 Industrial Crops > 820399 Industrial Crops not elsewhere classified @ 20%
96 ENVIRONMENT > 9609 Land and Water Management > 960912 Urban and Industrial Water Management @ 40%
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