The yield and quality of multiple harvests of filamentous Ulva tepida

Carl, Christina, Magnusson, Marie, Paul, Nicholas A., and de Nys, Rocky (2016) The yield and quality of multiple harvests of filamentous Ulva tepida. Journal of Applied Phycology, 28 (5). pp. 2865-2873.

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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.

Item ID: 46588
Item Type: Article (Research - C1)
ISSN: 1573-5176
Keywords: macroalgae, aquaculture, nutritional composition, Ulvan, Aonori
Funders: Queensland Accelerate Fellowship
Date Deposited: 06 Dec 2016 23:08
FoR Codes: 30 AGRICULTURAL, VETERINARY AND FOOD SCIENCES > 3005 Fisheries sciences > 300501 Aquaculture @ 40%
31 BIOLOGICAL SCIENCES > 3108 Plant biology > 310801 Phycology (incl. marine grasses) @ 10%
31 BIOLOGICAL SCIENCES > 3106 Industrial biotechnology > 310602 Bioprocessing, bioproduction and bioproducts @ 50%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8301 Fisheries - Aquaculture > 830199 Fisheries - Aquaculture not elsewhere classified @ 30%
82 PLANT PRODUCTION AND PLANT PRIMARY PRODUCTS > 8203 Industrial Crops > 820399 Industrial Crops not elsewhere classified @ 30%
86 MANUFACTURING > 8601 Processed Food Products and Beverages (excl. Dairy Products) > 860105 Nutraceuticals and Functional Foods @ 40%
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