European Researchers turn algae, herbs and agri-food by-products into Sustainable Fish Feed: Inside FEEDACTIV’s Green Innovation
Projects like FEEDACTIV illustrate that sustainability in aquaculture doesn’t begin in the sea—it begins in the feed factory, where science and nature now work together to grow the seafood of the future. Across Europe, a team of scientists and aquaculture experts is rethinking how we feed fish. Through the EU funded FEEDACTIV project, researchers from Greece, Italy, and Romania are transforming natural compounds from algae, agrifood by-products and Mediterranean herbs into powerful feed ingredients that boost fish health while helping aquaculture reduce its dependence on antibiotics. The work, supported by the Marie Skłodowska Curie Actions (MSCA), is showing how circular, science-driven innovation can make seafood production more sustainable, cost efficient, and environmentally friendly.
“Natural bioactive compounds from algae, agrifood by-products and herbs, coupled with microencapsulation technologies, can become practical feed tools supporting fish health and helping aquaculture move away from routine antibiotics,” Prof. Dan Christian Vodnar, University of Agricultural Sciences and Veterinary Medicine of Cluj-Napoca, Co-Ordinator of FEEDACTIV project
From Algae to Aquaculture: How FEEDACTIV Works
FEEDACTIV’s research unfolds through several tightly linked stages—each designed to turn natural extracts into usable feed additives.
WP3 – Extraction & Characterization
Scientists began by performing green extractions of bioactive compounds from plant and algae by‑products. They analyzed each extract’s total phenolic content, antioxidant activity and antimicrobial potential, selecting the most promising candidates for feed applications. Standardized batches were then supplied to the next stages of the project.
WP4 – Encapsulation
The selected extracts were stabilized through encapsulation—a technique that protects sensitive compounds during storage and feed processing. By experimenting with different food grade matrices and process conditions, the team produced microparticles with high encapsulation efficiency and stability, ensuring bioactives remain potent until digested by the fish.
WP5 – Feed Development and Quality Control
Researchers used both free and encapsulated phytobiotics to develop pilot‑scale fish feeds. They tested pellet integrity, nutrient homogeneity, and durability, while measuring how well bioactive molecules withstood extrusion. Shelf‑life and environmental footprint assessments (LCA/LCC) are underway, comparing the new feeds with conventional ones to quantify energy, cost, and sustainability gains.
WP6 – In Vitro and Semi-Pilot Testing
Extracts were screened against common fish bacterial pathogens, pinpointing those with the strongest antimicrobial effects. Subsequent semipilot trials measured fish immune responses and growth in tanks using enriched feeds—early indications show improved tolerance and vitality.
WP7 – Commercial Aquaculture Trials
With promising lab and pilot results, FEEDACTIV’s feeds are now being tested in real aquaculture farms across Southern Europe. Farmers are monitoring growth rates, feed efficiency, survival, and parasitic resistance, with the innovative diets showing strong acceptance and practical feasibility in everyday operations.
Hands-on Collaboration and Outreach
Beyond lab work, FEEDACTIV thrives on knowledge exchange. Workshops in Cluj‑Napoca, Romania (2023), and Lesvos, Greece (2024) brought together partners, farmers, and academics for dialogue on sustainable aquafeeds. The project has also engaged the public, featuring in the European Researchers’ Night 2023, where curious visitors learned how reimagined fish nutrition can strengthen local food systems.
The team’s field demonstrations and open communication help smaller aquaculture enterprises adopt greener ingredients and feed formulations—bridging science and everyday farming practice.
A Blueprint for Greener Seafood
By combining bio‑based extraction, encapsulation technology, feed formulation, and circular‑economy analysis, FEEDACTIV offers a concrete example of how EU research can create healthier fish and cleaner water while cutting chemical use.
More information and project outputs—including scientific data and multimedia—are publicly available on feedactiv.eu and through its open‑access repository on zenodo.org.
Projects like FEEDACTIV illustrate that sustainability in aquaculture doesn’t begin in the ocean—it begins in the feed factory, where science and nature now work together to grow the seafood of the future.