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Resumen del producto
Hernández-Sandoval, F.E., J.A., Del Ángel-Rodríguez, E.J., Núñez-Vázquez, C.J., Band-Schmidt, B.O., Arredondo-Vega, Á.I., Campa-Cordova, M., Moreno-Legorreta, L.J., Fernández-Herrera & D.J., López-Cortés
(2022).
Growth, lipid and biochemical bomposition of Thalassiosira weissflogii (Bacillariophyceae) cultured under two nitrogen sources.
Applied Sciences-Basel.
12(3): 961.
DOI: 10.3390/app12030961.
Growth, lipid and biochemical bomposition of Thalassiosira weissflogii (Bacillariophyceae) cultured under two nitrogen sources
Francisco Eduardo Hernández-Sandoval 1, Jorge Arturo Del Ángel-Rodríguez 2, Erick Julian Núñez-Vázquez, Christine Johanna Band-Schmidt 3, Bertha Olivia Arredondo-Vega 1, Ángel Isidro Campa-Cordova 1, Manuel Moreno-Legorreta 1, Leyberth José Fernández-Herrera 4 y David Javier López-Cortés 1
1 Centro de Investigaciones Biológicas del Noroeste (CIBNOR), La Paz, 23096, Mexico
2 Department of Ocean Sciences, Memorial University of Newfoundland, St. John’s, A1K 3E6, NL, Canada
3 Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas, Departamento de Plancton y Ecología Marina, Centro Interdisciplinario de Ciencias Marinas (IPN-CICIMAR), Instituto Politécnico Nacional, La Paz, 23096, Mexico
4 Departamento de Plancton y Ecología Marina, Centro Interdisciplinario de Ciencias Marinas (IPN-CICIMAR), Instituto Politécnico Nacional, La Paz, 23096, Mexico
he protein and polyunsaturated fatty acid (PUFA) enrichment of microalgae can improve their nutritional value for larvae of various reared organisms. Protein enrichment can be achieved by increasing nitrogen concentration and selecting nitrogen sources that are easy to assimilate during microalga culture. Nitrogen-rich cultures can increase organism growth, biomass, and protein content, but their lipid content tends to stall. Since the diatom Thalassiosira weissflogii is usually provided to feed shrimp larvae, this study evaluated its digestibility and biochemical composition, culturing it with two nitrogen sources (NaNO3 and NH4Cl) at different concentrations (111.25, 222.50, 445 and 890 M). The cell abundance, dry-weight biomass, Chl a, proteins, carbohydrates, total lipids and essential fatty acids were determined. The cell density and biomass peaked faster (day 12) with treatment < 890 M than with 890 M (day 15) in both nitrogen sources. However, the highest cell density, biomass and peak protein yield were not significantly different among treatments, suggesting the need to compare maintenance costs for a given production. After nine days of culture, concentrations 222.5 M increased lipid content irrespective of the nitrogen source and decreased by 10–20% afterwards. With higher lipid production, the dominant PUFA were eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). One gram of NH4Cl provides ~60% more nitrogen than 1 g of NaNO3. In conclusion, based on time and growth rate, T. weissflogii cultivated with NH4Cl at 222.50 M produced EPA and DHA at a better yield–cost ratio for biomass and lipid production. Furthermore, its nutritional value as enriched live-food for the reared larvae of marine organisms suggests potential biotechnological applications for aquaculture.
Palabras clave: biotechnological aquaculture; biochemical composition; fatty acid; nitrogen source; algal application
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