Optimizing conditions for the continuous culture of Isochrysis affinis galbana relevant to commercial hatcheries
|Author(s)||Marchetti Julie1, Bougaran Gael1, Le Dean Loic1, Megrier Cyril1, Lukomska Ewa1, Kaas Raymond1, Olivo Erell1, Baron Regis3, Robert Rene2, Cadoret Jean-Paul1|
|Affiliation(s)||1 : IFREMER, Lab Physiol & Biotechnol Algues, F-44311 Nantes 3, France.
2 : IFREMER, Stn Expt dArgenton, UMR Physiol & Ecophysiol Mollusques Marins 100, F-29840 Argenton En Landunvez, France.
3 : IFREMER, Lab Sci & Technol Bioressources Marines, F-44311 Nantes 3, France.
|Source||Aquaculture (0044-8486) (Elsevier Science Bv), 2012-01 , Vol. 326 , P. 106-115|
|WOS© Times Cited||52|
|Keyword(s)||Isochrysis affinis galbana, Irradiance efficiency, Factor interaction, Nutrient limitation, Microalgae cultures|
|Abstract||Optimal culture conditions were investigated for the continuous culture of Isochrysis affinis galbana (T-Iso) by assessing the effects of irradiance, temperature, pH and nitrogen and phosphorus requirements. Assessment of the growth rate-irradiance relationship in a turbidostat experiment highlighted that an optimum irradiance efficiency for growth (E-mu) occurred at irradiance much lower than the saturating level. Furthermore, our modeling approach for productivity pointed out that an optimal set of irradiance and dilution rate could be achieved in order to maximize irradiance efficiency. Optimal conditions for growth were assessed for temperature, pH and irradiance by means of a factorial design experiment. The resulting model predicted that optimal culture conditions occurred at pH = 6.8, irradiance = 780 mu mol photons.m(-2).s(-1) and temperature = 30 degrees C and emphasized significant pH-temperature and pH-irradiance interactions on growth. The critical N:P ratio was shown to be a decreasing function of the growth rate and revealed high requirements of T-Iso for nitrogen relative to phosphorus. Finally, we propose an integrative optimization procedure for the continuous culture of I. affinis galbana and outcomes are discussed. (C) 2011 Elsevier B.V. All rights reserved.|