Increased pCO2 changes the lipid production in important aquacultural feedstock algae Isochrysis galbana, but not in Tetraselmis suecica

Fitzer, S. C. , Plancq, J. , Floyd, C. , Kemp, F. M. and Toney, J. L. (2019) Increased pCO2 changes the lipid production in important aquacultural feedstock algae Isochrysis galbana, but not in Tetraselmis suecica. Aquaculture and Fisheries, 4(4), pp. 142-148. (doi: 10.1016/j.aaf.2019.02.008)

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Increased anthropogenic CO2 emissions are leading to an increase in CO2 uptake by the world's oceans and seas, resulting in ocean acidification with a decrease in global ocean water pH by as much as 0.3–0.4 units by the year 2100. The direct effects of changing pCO2 on important microalgal feedstocks are not as well understood. Few studies have focused on lipid composition changes in specific algal species in response to ocean acidification and yet microalgae are an indispensable food source for various marine species, including juvenile shellfish. Isochrysis galbana and Tetraselmis suecica are widely used in aquaculture as feeds for mussels and other shellfish. The total lipid contents and concentrations of I. galbana and T. suecica were investigated when grown under present day (400 ppm) and ocean acidification conditions (1000 ppm) to elucidate the impact of increasing pCO2 on an important algae feedstock. Total lipids, long-chain alkenones (LCAs) and alkenoates decreased at 1000 ppm in I. galbana. I. galbana produces higher lipids than T. suecica, and is perhaps as a result more impacted by the change in carbon available for lipid production under higher pCO2. I. galbana is an important feedstock, more easily assimilated for growth in juvenile shellfish and reductions in lipid composition may prove problematic for the growth of future shellfish aquaculture. Our findings suggest that higher pCO2 impacts on algal lipid growth are species specific and warrant further study. It is therefore vital to examine the impact of high CO2 on algal lipid production, especially those commercial shellfish feed varieties to predict future impacts on commercial aquaculture.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Fitzer, Dr Susan and Toney, Professor Jaime and Kemp, Ms Faith and Floyd, Cameron and Plancq, Dr Julien
Authors: Fitzer, S. C., Plancq, J., Floyd, C., Kemp, F. M., and Toney, J. L.
College/School:College of Science and Engineering > School of Geographical and Earth Sciences
Journal Name:Aquaculture and Fisheries
ISSN (Online):2468-550X
Published Online:16 March 2019
Copyright Holders:Copyright © 2019 Shanghai Ocean University
First Published:First published in Aquaculture and Fisheries 4(4): 142-148
Publisher Policy:Reproduced under a Creative Commons license

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
716661An understanding of biomineralisation pathways is key to predict climate change impact on aquacultureSusan FitzerNatural Environment Research Council (NERC)NE/N01409X/1SCHOOL OF GEOGRAPHICAL & EARTH SCIENCES