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<p>This study evaluated ten microalgae strains during exponential and stationary growth phases, assessing cell density, growth rate, generation time, cell size, total and organic dry weight, and proximate composition (carbohydrates, proteins, and lipids). Among the strains, <i>Phaeodactylum tricornutum</i> exhibited the highest cell density, while <i>Tetraselmis suecica</i> recorded the lowest. <i>Chaetoceros</i> sp<i>.</i> showed the fastest growth rate and shortest generation time, contrasting with <i>Chaetoceros calcitrans</i> and <i>Nitzschia thermalis</i>, which had lower growth and longer generation times. <i>Tetraselmis suecica</i> reached the highest total dry weight and organic dry during the stationary phase. Significant differences in biochemical composition were observed: <i>Amphora helenensis</i> and <i>Isochrysis galbana</i> exhibited elevated carbohydrate levels, with <i>Isochrysis galbana</i> showing the highest protein content. Additionally, <i>Chaetoceros</i> sp. and <i>Isochrysis was measured using agalbana</i> had the highest lipid levels. Biomass productivity was greatest in <i>Tetraselmis suecica</i>, and lipid prois minimum fluorescence, resulting in the variable fluductivity was highest in <i>Chaetoceros</i> sp<i>.</i> and <i>Isochrysis galbana</i>. Fatty acid profiles varied among strains, with <i>Amphora helenensis</i> exhibiting high levels of eicosapentaenoic acid (EPA) and <i>Isochrysis galbana</i> displaying elevated levels of docosahexaenoic acid (DHA). Photosynthetic parameters, including maximum electron transport rate (ETRmax), initial slope (α), light saturation (Ik), and maximum quantum efficiency (F<sub>v</sub>/F<sub>m</sub>), differed by species and growth phase, highlighting functional diversity. The five newly isolated strains—<i>Chaetoceros</i> sp<i>.</i>, <i>Nitzschia laevis</i>, <i>Tetraselmis suecica</i>, <i>Amphora helenensis</i>, and <i>Nitzschia thermalis</i>—demonstrated distinct physiological and biochemical traits. <i>Chaetoceros</i> sp<i>.</i> showed high growth and lipid accumulation, while <i>Tetraselmis suecica</i> exhibited the best biomass productivity. These strains show great potential for optimizing aquaculture feed formulations and sustainable biomass production.</p>

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Biochemical composition and photosynthesis of selected marine microalgae, with emphasis on lipid production for potential use in aquaculture

  • 期刊论文

  • 发表日期：

    2025年6月4日

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  • Noelia I. Pérez-Varillas,
  • M. del Pilar Sánchez-Saavedra

摘要

This study evaluated ten microalgae strains during exponential and stationary growth phases, assessing cell density, growth rate, generation time, cell size, total and organic dry weight, and proximate composition (carbohydrates, proteins, and lipids). Among the strains, Phaeodactylum tricornutum exhibited the highest cell density, while Tetraselmis suecica recorded the lowest. Chaetoceros sp. showed the fastest growth rate and shortest generation time, contrasting with Chaetoceros calcitrans and Nitzschia thermalis, which had lower growth and longer generation times. Tetraselmis suecica reached the highest total dry weight and organic dry during the stationary phase. Significant differences in biochemical composition were observed: Amphora helenensis and Isochrysis galbana exhibited elevated carbohydrate levels, with Isochrysis galbana showing the highest protein content. Additionally, Chaetoceros sp. and Isochrysis was measured using agalbana had the highest lipid levels. Biomass productivity was greatest in Tetraselmis suecica, and lipid prois minimum fluorescence, resulting in the variable fluductivity was highest in Chaetoceros sp. and Isochrysis galbana. Fatty acid profiles varied among strains, with Amphora helenensis exhibiting high levels of eicosapentaenoic acid (EPA) and Isochrysis galbana displaying elevated levels of docosahexaenoic acid (DHA). Photosynthetic parameters, including maximum electron transport rate (ETRmax), initial slope (α), light saturation (Ik), and maximum quantum efficiency (Fv/Fm), differed by species and growth phase, highlighting functional diversity. The five newly isolated strains—Chaetoceros sp., Nitzschia laevis, Tetraselmis suecica, Amphora helenensis, and Nitzschia thermalis—demonstrated distinct physiological and biochemical traits. Chaetoceros sp. showed high growth and lipid accumulation, while Tetraselmis suecica exhibited the best biomass productivity. These strains show great potential for optimizing aquaculture feed formulations and sustainable biomass production.