Bespoke koi ponds designed for beauty, built for the health of your fish and garden.
A koi pond is a purpose-built water feature designed specifically to house and showcase koi fish – one of the world’s most admired ornamental species. More than just a garden addition, a koi pond is a living ecosystem: a careful balance of water quality, filtration, depth, oxygenation, and planting that keeps your fish thriving and your garden transformed.
At Oásis Biosistema, we design and construct koi ponds that honour both the Japanese tradition of koi keeping and the natural beauty of the Portuguese landscape. Every project is built to last, to perform, and to look exceptional, whether for a private villa, a quinta, or a luxury garden retreat.
We offer a complete service from initial consultation through to long-term maintenance, so your koi pond is never a source of stress, only pleasure.
We begin by understanding your vision, your garden’s layout, and the conditions of your site. Our team develops a bespoke concept with sketches, material recommendations, and a transparent cost estimate – tailored to the size and complexity of your project.
Plants are not just decorative – they play an active role in water filtration and ecosystem balance. We select and install species suited to Portugal’s climate, integrating them naturally into your pond’s design for a seamless, organic aesthetic.
Our construction process is thorough and built to professional standards. We handle excavation, shaping, structural lining, and all technical installations – including filtration, aeration, and drainage – so your pond is sound from the ground up.
Enhance your koi pond after dark with underwater LED lighting, decorative rockwork, waterfalls, or surrounding stonework. We help you design a complete outdoor experience, day and night.
Koi produce significant waste, and their health depends entirely on water quality. We design and install high-performance biological and mechanical filtration systems sized to your pond’s volume and fish load, ensuring clean, oxygenated water year-round.
We offer seasonal and year-round maintenance plans covering water quality monitoring, filter cleaning, plant management, and fish health checks – so your koi pond stays pristine without requiring your daily attention.
Every koi pond we build is designed around the specific needs of your fish, your garden, and your lifestyle.
We help you visualise the final result with mood boards, 3D mockups, and material samples during consultation.
Formal rectangular, naturalistic freeform, Japanese-inspired, geometric
Biological filters, mechanical pre-filters, UV clarifiers, bottom drains
Minimum 1.2m to 1.5m recommended for koi health and predator protection
Waterfalls, streams, fountains, aeration systems, auto top-up valves
EPDM rubber liners, reinforced concrete, Portuguese natural stone
Wooden decks, viewing bridges, surrounding planting, ambient lighting
A koi pond is not a standard garden feature. It is a living system, and errors in design – insufficient depth, inadequate filtration, poor liner installation, or incorrect water chemistry management – lead directly to fish loss and costly repairs.
At Oásis Biosistema, we bring over a decade of experience designing aquatic ecosystems in Portugal. We understand the country’s climate, water conditions, and the specific challenges of maintaining a healthy koi environment through hot Portuguese summers and mild winters. Every pond we build is designed with the fish’s welfare as the primary concern, without compromising on aesthetics.
Based in Portugal, Serving Nationwide
Specialists in Aquatic Ecosystems and Biological Filtration
Eco-Conscious, Non-Toxic Materials Throughout
Full-Service: Design, Construction, and Maintenance
10+ Years Creating Natural and Ornamental Water Features
5-Star Reviews from Clients Across Portugal
Certifications & Trust Marks: Licensed in Portugal | Sustainable Practices | Eco-Friendly Materials | Alvará de Construção IMPIC nº 107069 – PAR
Ready to bring a koi pond into your garden? Contact us for a free, no-obligation consultation and we’ll design something exceptional together.
A koi pond is a specially designed water feature built to house koi fish. It requires adequate depth, robust biological filtration, and good water circulation to maintain the health of the fish. Koi ponds can be formal or naturalistic in style and are a striking centrepiece in any garden.
Koi ponds should be a minimum of 1.2 to 1.5 metres deep. Greater depth – up to 2 metres – provides better temperature stability, more swimming space for the fish, and protection from predators such as herons. Shallow ponds are not suitable for koi long-term.
Koi ponds require a combination of mechanical filtration (to remove solid waste), biological filtration (to process ammonia through beneficial bacteria), and UV clarification (to control algae and pathogens). The system must be sized correctly for your pond’s volume and fish load.
The cost of a koi pond in Portugal varies based on size, depth, filtration complexity, materials, and added features such as waterfalls or lighting. We provide transparent, itemised quotes following an initial consultation. Contact us to discuss your project and receive a personalised estimate.
Yes, koi thrive in Portugal’s climate with proper pond design. Adequate depth prevents overheating in summer, and our filtration systems are specified to maintain water quality year-round. We have extensive experience building koi ponds across Portugal’s diverse regions.
Lisboa | Cascais | Comporta | Algarve | Porto | Sintra | Braga | Setúbal | Alentejo | and more.
Need help now? Call us at +351 934 679 342 or send an email to geral@oasisbiosistema.com / comercial@oasisbiosistema.com
