NaturaFish
Portuguese aquaculture company farming natural European seabass and gilthead seabream in the Algarve's estuaries.
Last updated September 27, 2026
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Overview
NaturaFish is a Portuguese aquaculture company based in Portimão, in the Algarve region, dedicated to the sustainable production of European seabass (Dicentrarchus labrax) and gilthead seabream (Sparus aurata). The company was created to meet growing global demand for natural, sustainable aquaculture, positioning itself as Portugal's leader in the farming of valuable local species whose demand exceeds biologically sustainable fishing levels. Its operations are centred on natural pond farming in the clean inlets and estuaries of the Algarve, particularly the Ria de Alvor, where clean water, tidal renovation, temperate weather and a nutrient-rich environment allow fish to be raised at higher densities than would otherwise be possible. NaturaFish describes its product as being "at a level higher than organic" — natural and sustainable. The company takes pond farming to new levels by using technology to closely monitor each pond for erosion, water renovation, oxygen levels, bacteria counts, pathologies, temperature, nutrition, predation and intrusion. Rather than antibiotics or other chemicals, it uses essential oils to treat certain ailments and to handle fish during sampling, reducing stress on the animals. Its flagship offerings are European seabass and gilthead seabream, sold in graded sizes (for example 400g–600g, 600g–800g and 800g–1000g) and packaged in 6 kg polystyrene boxes. The company markets its output as "Europe's best-kept secret in aquaculture," emphasising efficient and scalable production of naturally farmed fish. The business is led by CEO Miguel Theriaga, a pharmaceutical sciences graduate with two decades of experience managing natural ponds, particularly in the Ria de Alvor. He is described as a pioneer in developing and using natural methods for rearing seabass and seabream in estuaries, including fully natural feed formulas, essential-oil treatments, low-stress harvesting techniques, proprietary aquaculture production-management systems, multi-species research and vaccination with native bacteria. The wider team has decades of experience in natural pond farming in Portugal's clean inlets and estuaries, and most members have worked together for years under Theriaga's leadership. Other named managers include Ricardo Costa (Production Manager) and Rosa Costa (Finance and Accounting Manager), who joined the company in 2018. NaturaFish invests substantially in research and development to improve continuously without compromising its quest for "natural." Its stated mission is to produce the highest quality fish anywhere, mindful of its people, community, the animals in its care and the environment. The company operates from the Algarve and serves markets in Portugal and Europe. It is a private company and, as of the available evidence, does not disclose a parent company or ownership group.
History
NaturaFish was created to meet the growing global demand for natural, sustainable aquaculture, with the ambition of becoming Portugal's leader in the farming of valuable local species for which demand exceeds biologically sustainable fishing levels, such as European seabass (Dicentrarchus labrax) and gilthead seabream (Sparus aurata). The company is based in Portimão, in the Algarve region of southern Portugal, and its operations are centred on natural pond farming in the region's clean inlets and estuaries, particularly the Ria de Alvor. The company's approach draws on decades of experience in natural pond farming in Portugal's clean inlets and estuaries. Its team, most of whom have worked together for years, is led by CEO Miguel Theriaga, who has 20 years of experience managing natural ponds, with particular expertise in the Ria de Alvor. Theriaga is described as a pioneer in the development and use of natural methods for rearing seabass and seabream in estuaries. These methods include fully natural feed formulas that improve flavour, texture and colour; the use of essential oils to treat pathologies and as anaesthetics to reduce fish stress during handling, such as sampling; modern and innovative techniques that reduce stress and suffering during harvesting while improving flavour, texture and shelf life; proprietary aquaculture production-management systems, including production cost and biomass modelling; research into multi-species production in estuaries, such as gilthead seabream, red porgy and sole; and vaccination with native bacteria. Theriaga holds a degree in Pharmaceutical Sciences from the University of Lisbon and an advanced qualification in Industrial Management and Information Systems from INDEG-ISCTE, and is a former production manager at Schering Plough Pharma and Janssen Cilag. Rosa Costa, the company's Finance and Accounting Manager, joined NaturaFish in 2018. She holds a degree in Accounting and Administration from the Instituto Superior de Contabilidade e Administração do Porto and has more than 25 years of experience as a certified accountant, having previously been responsible for the accounting of numerous companies in areas such as commerce, general contracting, tourism and real estate administration. Ricardo Costa serves as Production Manager. NaturaFish invests substantially in research and development to improve continuously without compromising its quest for "natural." The company states that location, experience, technology and innovation are keys to its success, working with nature rather than against it. Its mission is to produce the highest quality fish anywhere, mindful of its people, community, the animals in its care and the environment. The company markets its output as "Europe's best-kept secret in aquaculture," emphasising efficient and scalable production of naturally farmed European seabass and gilthead seabream, where it claims a sustainable competitive advantage. It operates from the Algarve and serves markets in Portugal and Europe.
- 2018
Rosa Costa joins NaturaFish as Finance and Accounting Manager.
Products and positioning
Natural, sustainable aquaculture positioned above organic standards, using technology and natural methods to farm seabass and seabream in Algarve estuaries.
European seabass (Dicentrarchus labrax)
Gilthead seabream (Sparus aurata)
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