ESTM - Mestrado em Aquacultura
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Browsing ESTM - Mestrado em Aquacultura by Author "Abreu, Márcia Perestrelo"
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- Study of the potential of the macroalgae Halopteris scoparia in aquaculture productionPublication . Abreu, Márcia Perestrelo; Mouga, Teresa Margarida Lopes da Silva; Pombo, Ana Margarida Paulino ViolanteThis thesis explored the cultivation conditions and growth patterns of Halopteris scoparia under controlled laboratory settings, with the goal of optimizing its growth for potential use in Integrated Multi-Trophic Aquaculture (IMTA) systems alongside marine fish. Healthy, wild thalli of H. scoparia were collected, acclimated, and subjected to various experiments to assess the effects of different culture media, salinity levels, stocking densities, light conditions, temperature, and wastewater reuse. Throughout the trials, it was observed that these factors significantly influenced the key growth parameters, Relative Growth Rate (RGR) and productivity, of H. scoparia. Notably, the introduction of the commercial medium Nutribloom® led to a significant increase in growth rates. The macroalgae presented adaptability to different salinities and an optimal growth with lower stocking densities (1g/L). The use of white LED light also enhanced growth performance, while temperature trials did not yield conclusive results. Furthermore, H. scoparia demonstrated positive growth when cultivated in wastewater from a meagre (Argyrosomus regius) fish farm using a recirculating aquaculture system (RAS), both in full-strength and diluted forms. Analysis of the cultivated biomass revealed notable differences in humidity and ash content compared to wild specimens, underscoring the influence of cultivation conditions on seaweed composition. Overall, the study highlights the species' potential for rapid growth in aquaculture and its suitability for integration into IMTA systems.