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Ocean4Biotech | Rome, May 2023

Large-scale cultivation of the microalgae Tetraselmis striata and utilization of the biomass produced as alternative raw material in fish feed

Roussos Efstratios1, Vasiliki Patrinou2, Tekerlekopoulou Athanasia2, Kampantais Dimitrios1, Triantaphyllidis George1 and Kotzamanis Yannis1

  • 1 Hellenic Centre for Marine Research, Institute of Marine Biology, Biotechnology and Aquaculture, Laboratory of Fish Nutrition and Omics Technologies
  • 2 Department of Environmental Engineering, University of Patras


The aim of this work was to evaluate the marine microalgae Tetraselmis striata biomass cultivated in drilling waters, as an ingredient in the feeds of European sea bass (Dicentrarchus labrax). The suitability of the produced biomass for incorporation into sea bass feeds was tested, following research on the optimization of the important functional parameters which affect its growth such as pH, temperature, photoperiod, and CO2 flow rate in large-scale production unit. A high fishmeal diet (32%) was served as a pelleted control diet, while a commercial T. striata biomass was incorporated in three diets at 2, 4, and 8% levels to substitute fishmeal, respectively. A fifth diet was formulated to include a 4% level of locally large-scale-produced T. striata. Fifteen sea bass fish with an average weight of 25.5 g were separated in 15 cylindroconical tanks with a volume of 1m3 (triplicates) in a programmable logic controller (PLC) controlled Recirculating aquaculture system (RAS). Fish were fed to apparent satiation (ad libitum) for approximately 2 months. The results showed that fish growth and health were satisfactory in all experimental diets and zootechnical indicators representative of fish size and species. The addition of microalgal biomass in the aquafeeds didn’t seem to affect the palatability of the experimental feeds. Commercial and produced biomass of the Tetraselmis striata strain didn’t present any statistically significant differences in terms of growth. In the targeted fishmeal substitution levels (2, 4 and 8%), the T. striata could successfully partially replace fish meal as the results showed a comparable growth within the 2-month feeding trial.

Ocean 4Biotech Rome 2023

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