{"paper_id":"0636c2e5-3dcf-4530-bb59-5ea214c6d25b","body_text":"Phycoremediation of fish farming effluent with Scenedesmus acuminatus and use of the biomass in tambaqui (Colossoma macropomum) feed formulation | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article Phycoremediation of fish farming effluent with Scenedesmus acuminatus and use of the biomass in tambaqui (Colossoma macropomum) feed formulation Renan Gomes Nascimento, Raize Castro Mendes, Cláudia Maiza Fernandes Epifânio, and 3 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7821058/v1 This work is licensed under a CC BY 4.0 License Status: Under Review Version 1 posted 9 You are reading this latest preprint version Abstract Aquaculture generates large volumes of nutrient-rich effluents that, if untreated, contribute to eutrophication. Microalgae-based phycoremediation offers a sustainable strategy to recycle these effluents while producing biomass of nutritional value. This study aimed to evaluate the production and nutritional composition of Scenedesmus acuminatus (SA) biomass cultivated in aquaculture effluent and to assess its inclusion in tambaqui ( Colossoma macropomum ) diets. The effluent was collected from intensive Brycon amazonicus tanks and used as the sole nutrient source for S. acuminatus cultivation in photobioreactors. Five isonitrogenous (32.2% crude protein) and isoenergetic (17.22 MJ/kg) experimental diets were formulated, including a control (SA0%) and four diets with increasing microalgal inclusion levels (SA1%, SA2%, SA3%, and SA5%). Juvenile tambaqui were fed these diets for five weeks, and growth performance, health parameters, and fillet nutritional composition were evaluated. S. acuminatus achieved consistent biomass yields with nutrient profiles comparable to conventional media. Its dietary inclusion did not compromise survival (100% across treatments), feed intake, or proximate composition of whole fish and fillets. Hematological analyses indicated immunomodulatory effects at higher inclusion levels, while fillet fatty acid profiles improved with increased omega-3 content, particularly at SA3%. These findings highlight the dual role of S. acuminatus in aquaculture effluent bioremediation and as a functional feed ingredient. The use of aquaculture effluents as culture medium supports circular bioeconomy principles and provides a sustainable alternative for the development of value-added aquafeed. Circular economy microalgae Functional aquafeed Sustentável Aquafeed Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Under Review Version 1 posted Editorial decision: Revision requested 01 Dec, 2025 Reviews received at journal 28 Nov, 2025 Reviews received at journal 22 Oct, 2025 Reviewers agreed at journal 16 Oct, 2025 Reviewers agreed at journal 13 Oct, 2025 Reviewers invited by journal 13 Oct, 2025 Editor assigned by journal 13 Oct, 2025 Submission checks completed at journal 13 Oct, 2025 First submitted to journal 09 Oct, 2025 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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Microalgae-based phycoremediation offers a sustainable strategy to recycle these effluents while producing biomass of nutritional value. This study aimed to evaluate the production and nutritional composition of \\u003cem\\u003eScenedesmus acuminatus\\u003c/em\\u003e (SA) biomass cultivated in aquaculture effluent and to assess its inclusion in tambaqui (\\u003cem\\u003eColossoma macropomum\\u003c/em\\u003e) diets. The effluent was collected from intensive \\u003cem\\u003eBrycon amazonicus\\u003c/em\\u003e tanks and used as the sole nutrient source for \\u003cem\\u003eS. acuminatus\\u003c/em\\u003e cultivation in photobioreactors. Five isonitrogenous (32.2% crude protein) and isoenergetic (17.22 MJ/kg) experimental diets were formulated, including a control (SA0%) and four diets with increasing microalgal inclusion levels (SA1%, SA2%, SA3%, and SA5%). 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