Tag Archives: aquaponics

This Rotating Solar House Grows Fish and Plants Entirely on Its Own

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Aquaponic gardening has been getting a lot of attention as a more sustainable way to grow food, especially in urban settings where arable land isn’t exactly plentiful. The concept pairs fish and plants in a closed-loop system where each supports the other, cutting out synthetic fertilizers and reducing water waste. Most implementations, though, tend to be utilitarian and aren’t built to handle seasonal changes without significant supplemental energy input.

That’s the problem Michael Jantzen’s Eco-Aquaponic House was designed to tackle. Built as a public exhibit for a botanical garden, it functions more like a machine than a greenhouse, engineered to grow fish and plants together in an energy-efficient and largely self-sustaining way. Jantzen, whose work merges art, architecture, technology, and sustainable design, has been experimenting with this kind of thinking for over 50 years.

Designer: Michael Jantzen

The system works on a simple but elegant biological loop. Fish waste is cycled through the roots of the surrounding plants as a natural fertilizer. The plants filter the water, which then returns to the fish tank. The cycle repeats continuously with minimal outside input, keeping both fish and plants alive. It’s the kind of closed-loop food production that makes conventional growing methods look rather wasteful by comparison.

What makes the structure particularly clever is how it manages growing conditions year-round without demanding much energy. Six sections rotate around a central pivot point, each serving a different climate function. Two insulated panels wrap around the interior during cold nights to retain heat. Two shade screen sections shield the plants on hot days. Two glass sections open to let in outside air when conditions allow.

The passive thermal management doesn’t stop there. Built around the perimeter of the stationary base are large tubes filled with a heat-retention material that absorbs solar energy during the day and releases it slowly at night, helping keep the fish and plants warm through winter without relying on active heating systems. Those same tubes also moderate daytime temperatures, preventing the interior from overheating when the sun is strong.

On top sits a sun-tracking solar cell array that follows the sun throughout the day, supplying most of the structure’s electrical needs, including the large lamp hung over the central fish tank. Small windows built into the glass sections allow for additional ventilation control when the glass is in the closed position, letting you fine-tune interior conditions depending on what the fish and plants need at any given time.

Inside, plant trays are built into the perimeter of the structure, forming a ring of greenery around the central cylindrical fish tank. Visitors to the botanical garden can get a sense of the system from the outside, or arrange private tours for a closer look from inside through the rear entry door. As a public exhibit, it’s designed as much to teach people about aquaponic gardening as it is to actually grow. It’s a growing facility that takes care of itself season after season, with very little outside intervention required.

The post This Rotating Solar House Grows Fish and Plants Entirely on Its Own first appeared on Yanko Design.

A Living Sphere: Japan’s Self-Contained Food Ecosystem Points to Urban Agriculture’s Future

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Perched at the Osaka Health Pavilion during Expo 2025, a translucent dome hums with life. Inside, tomatoes ripen above brackish water while pufferfish swim below, their waste feeding the plants that clean their home. This is “Inochi no Izumi,” or “Source of Life,” a 21-foot-high sphere that reimagines how cities might feed themselves. The dome’s genius lies in its vertical arrangement. Four water compartments form the base: seawater, brackish water, and two freshwater tanks. Each supports aquatic species matched to its salinity, from marine groupers to freshwater sturgeon. Above each tank rises a corresponding tier of hydroponic crops, creating four parallel ecosystems stacked inside a single structure.

The nutrient cycle starts underwater. Fish excrete ammonia-rich waste that specialized microbes convert into nitrites, then nitrates. Pumps lift this nutrient-loaded water to feed the plants directly overhead. As roots absorb nitrogen compounds, they return purified water to the tanks below. Nothing leaves the system. Nature’s wetland cycling becomes an engine for food production. The broader the range of compatible species, the more resilient and self-sufficient the ecosystem becomes. That diversity mirrors natural systems but remains optimized for human consumption.

Designer: VikingDome, Osaka Metropolitan University’s Plant Factory R&D Center & Tokyo University of Marine Science & Technology

Each layer hosts plants suited to its water source. Salt-tolerant halophytes like sea asparagus and sea purslane grow above the seawater tank housing red seabream and black porgy. Sea grapes flourish in the saltwater itself. Move up a tier, and semi-tolerant tomatoes thrive on brackish water where Japanese pufferfish and ornamental carp glide. The freshwater zones support functional vegetables—nutrient-dense herbs and lettuces—while edible flowers, including nasturtium and marigold crown the top tier, their beds rotating via built-in motors to optimize light exposure.

The dome’s outer skin consists of transparent ETFE panels stretched across 245 steel structural bars connected by 76 joints. This geodesic framework, built using VikingDome’s T-STAR system, covers 1,378 square feet while weighing just over two tons. The entire structure arrived at Yumeshima Island on three pallets. Its design maximizes sunlight penetration while maintaining stable internal temperatures, creating a microclimate where multiple growing zones coexist.

Developed with Osaka Metropolitan University’s Plant Factory R&D Center and Tokyo University of Marine Science and Technology, this system demonstrates agricultural biodiversity at work. The practical applications extend beyond exhibition. Dense urban centers with limited ground space could host these modular systems on rooftops or in narrow lots. Land-poor regions where traditional farming struggles could gain food independence. Disaster-prone areas might deploy closed-loop domes for decentralized production unaffected by soil contamination or water scarcity.

What makes Source of Life compelling isn’t revolutionary technology. The core principle—aquaponics—has existed for decades. Rather, it’s the elegant integration of ecological understanding with space-efficient design. Commercial agriculture often chases yield through inputs: fertilizers, pesticides, energy. This dome inverts that logic, asking what happens when we design with nature’s cycles instead of against them. As cities grow and climate pressures mount, feeding urban populations sustainably demands fresh thinking. This geodesic greenhouse suggests one path forward: upward, inward, and circular.

The post A Living Sphere: Japan’s Self-Contained Food Ecosystem Points to Urban Agriculture’s Future first appeared on Yanko Design.