What if your garden became a mini-ecological farm ? Thanks to greenhouses and outdoor aquaponics kits, you can produce your own sustainable food, completely independently.
Aquaponics is attracting more and more curious people looking for healthy food and environmentally friendly production. However, not all installations have the same purpose : an outdoor aquaponics kit generally allows for small-scale production and is primarily educational and fun, while an aquaponic greenhouse opens the way to much more ambitious food self-sufficiency. These two approaches offer different experiences and are worth exploring to determine which best suits your needs.
An outdoor aquaponics kit is a compact, turnkey solution designed for those looking to easily get started with this sustainable growing method. Installed in a garden, on a terrace, or on a spacious balcony, it transforms a simple pond into a truly productive ecosystem, where fish and plants coexist. More fun than truly agricultural, it appeals to hobbyists and curious gardeners who want to discover aquaponics by producing some fresh vegetables while livening up their outdoor space.
The aquaponic greenhouse is an installation designed to go far beyond the simple discovery of aquaponics. Larger and more comprehensive than a kit, it is aimed at those who wish to move towards true food self-sufficiency. In a greenhouse, fish and plants thrive in a protected environment, sheltered from bad weather, frost, or excessive rain. This ensures much more regular and predictable production. Thanks to the heat accumulated during the day and retained by the structure, it is possible to extend growing cycles and even grow crops in winter in some regions.
An aquaponic greenhouse isn't just about growing salads or herbs : it opens the door to growing a variety of vegetables, even small fruits, while also allowing for the breeding of fish in sufficient quantities to truly contribute to a family's diet. This dimension makes it a more ambitious and demanding project, requiring space, careful planning, and a larger initial investment. But in return, it offers more complete food independence and an immersive experience in a complete ecosystem.
An aquaponics kit installed outdoors doesn't have the same purpose as a greenhouse. Its strength lies in its simplicity and accessibility. Easy to install and maintain, these small systems allow you to discover the principles of aquaponics without becoming overly complex. They transform a garden, a terrace, or even a large balcony into a vibrant and interactive space, where you can observe fish, grow a few vegetables, and learn about the functioning of an ecosystem.
These kits are particularly interesting for hobbyists looking for a compromise between aesthetics and production. Unlike a purely decorative pond, they add a nutritional dimension to the outdoor space. Even if the harvests remain modest, the pleasure of watching your own plants grow and raising a few fish makes it both an educational and fun experience. They also allow you to familiarize yourself with the basics of water management, biological balance, and the nitrogen cycle, which is an ideal first step before possibly considering a more ambitious project.
The benefits of an aquaponic greenhouse go far beyond the simple pleasure of growing. It offers a large production area, protected from the vagaries of the weather, and guarantees greater stability of the parameters essential to aquaponics. Thanks to this controlled environment, plants grow faster and fish thrive in safer conditions. This allows for significantly higher productivity than an outdoor kit.
Additionally, the greenhouse offers true continuity in cultivation. While an outdoor kit remains dependent on the seasons and can be slowed down in winter, the greenhouse ensures regular production for much of the year. It thus becomes a powerful tool for moving towards food self-sufficiency, reducing dependence on traditional distribution channels, and engaging in a more sustainable approach. By carefully choosing fish species and vegetable varieties, it is possible to diversify production and ensure a healthy, local diet for an entire family.
Investing in aquaponics requires adapting your budget to your ambitions. An outdoor aquaponics kit generally costs between €1,500 and €6,500 depending on the size of the pond, the materials used, and the options offered. Some simpler models can be rented, which reduces costs, and it is also possible to build your own system from spare parts.
Aquaponic greenhouses represent a more substantial investment, ranging from €4,000 for basic models to over €20,000 for larger structures. This higher cost is explained by the acquisition of more substantial equipment and its capacity to ensure diversified and continuous production. The budget therefore remains very variable !
One of the major advantages of outdoor aquaponics is the diversity of possible crops. In a kit, easy-to-grow, fast-growing plants like lettuce, herbs, or cherry tomatoes are often preferred. However, it's also possible to grow strawberries, which are particularly well-suited to this type of system.
In an aquaponic greenhouse, the possibilities expand : you can grow more demanding vegetables such as eggplants, melons, cucumbers or even large tomatoes.
When it comes to fish, the choice depends on the climate and available volume. Carp, trout, perch, pikeperch, and even catfish can be raised using aquaponics, offering a wide range of options.
Getting started with outdoor aquaponics comes with challenges that must be anticipated to ensure the system's success. Temperature fluctuations are one of the main challenges : a small kit will be more sensitive to rapid changes, while a greenhouse better protects crops by creating a more stable microclimate. Water balance also requires regular monitoring, particularly of pH, oxygenation, and nutrient concentration.
Outdoors, pests can also be a problem : birds, insects, rodents, or even cats and herons attracted to the fish. Simple protections like netting, polytunnels, or reinforced shelters can limit these risks. Finally, keep in mind that aquaponics relies on a fragile ecosystem, which takes time to stabilize. Patience, consistency, and careful monitoring are therefore essential to transform the experience into a lasting success.
Greenhouses and outdoor aquaponics kits serve different purposes. The kit, simple and fun, allows you to discover aquaponics and produce a little for fun. The greenhouse, more ambitious, paves the way for real and sustainable food self-sufficiency.
The choice will depend on budget, available time, and individual expectations. Between the diversity of cultivated species and the challenges of maintaining the system's balance, outdoor aquaponics remains, above all, an enriching experience that brings you closer to nature and restores meaning to the act of producing your own food.
Sources
ITAVI et APIVA, Réglementation et aquaponie, Aurélien Tocqueville, Salon Aquaponie 2020, Declaration and authorisation thresholds in France, and exclusion of the recirculated circuit from organic certification.
SMIDAP, Étude de la faisabilité technico-économique d'un pilote d'aquaponie dans les Pays de la Loire, 2018, Feedback from a 120 m2 unheated tunnel, run with alternating trout and pike-perch.
Virginia Tech, Calculating and Using Daily Light Integral (DLI): An Introductory Guide (SPES-720), Eric Stallknecht, Daily light requirement for lettuce and the supplementary lighting duration needed.
Barbosa et al., Comparison of Land, Water, and Energy Requirements of Lettuce Grown Using Hydroponic vs. Conventional Agricultural Methods, IJERPH 12(6), 2015, Measured energy cost of soilless greenhouse cultivation compared with open-ground growing.
Oklahoma State University Extension, Recirculating Aquaculture Tank Production Systems: Aquaponics, Integrating Fish and Plant Culture, Feed rate per square metre and the volume ratio between pond and grow medium bed, for sizing an expansion.
Rarely. The pond must remain frost-free to a sufficient depth, and the pump as well as any exposed pipes will crack after just one prolonged overnight frost.
Light often matters more than heat. The SPES-720 guide from Virginia Tech puts a lettuce plant's requirement at around 12 to 17 moles of light per square metre per day, and shows that a supplementary light set to 200 µmol per square metre per second needs to run for roughly eleven hours to reach fifteen moles. In December at our latitudes, an unlit greenhouse falls well below this threshold, which explains crops that don't die but simply stop growing.
Adding heating and lighting comes with an energy cost that must be faced squarely. A study by Barbosa et al. published in IJERPH in 2015 measured, for lettuce, 90,000 kJ per kilogram per year in hydroponic greenhouse production against 1,100 kJ in open-field growing — a factor of around 82. The gains in water use and yield come at the price of electricity.
An alternative exists and is well documented. The Loire Valley pilot project monitored by the SMIDAP was run in a 120 m2 plastic tunnel with no heating or ventilation equipment whatsoever, by matching species to the season — rainbow trout for the winter cycle and pike-perch for the summer cycle. Fitting species to the climate costs far less than forcing the climate.
Product data sheets tend to highlight footprint and plant count — rarely the factors that actually determine success. Five points are worth asking the supplier about in writing.
A kit that is properly documented on these five points is straightforward to manage. One that only gives you a litre count and attractive photographs will leave you improvising the moment something goes wrong.
Aurélien Tocqueville's presentation for the ITAVI notes that there is no regulatory framework specific to aquaponics and that the fish farming framework is used instead. An installation with a production capacity below twenty tonnes falls under a declaration requirement under water law; above that threshold, ICPE authorisation applies. A domestic system is well below these thresholds, but any project intended for sale must address the question from the outset.
Two points often come as a surprise. Water abstraction has its own thresholds, and organic certification is closed to recirculating aquaculture systems, with the exception of hatcheries and nurseries. It is also worth noting that our shop does not sell live fish; stocking is done through licensed fish farms.
Yes, provided you expand the growing area and the filtration at the same time as the pond, not the pond alone. Oklahoma State University's extension programme gives the benchmark that underpins any expansion: roughly 60 to 100 grams of feed per square metre of growing area per day in deep water culture, and approximately one quarter of that level for a gravel bed or an NFT gutter. It also offers a simple volume ratio for gravel beds: one volume of fish tank to two volumes of grow medium.
In practice, doubling the number of fish without doubling the growing area produces excess nitrates, cloudy water, and plants unable to absorb the load. A system should be scaled up in stages, allowing several weeks for the bacterial colony to catch up.
A net stretched a few centimetres above the water remains the most effective protection, but only if it is kept taut — a slack net simply becomes a trap. Above all, provide a deep zone and a submerged shelter: tiles, large-diameter pipes or floating plants, because a fish that has somewhere to hide is rarely taken. Wires stretched around the perimeter deter the heron, which lands on the ground and walks towards the edge.
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