Sandponics (iAVs)

Integrated Aqua-Vegeculture Systems (iAVS) are a sustainable and efficient way to grow fish and vegetables in a closed-loop system. Building an iAVS system requires careful planning and attention to detail. Here are some steps to follow when building an iAVS system:

1. Site Selection: When building an iAVS system, the first step is to select a suitable site.

While the ideal conditions include access to a reliable source of water, level ground, and good drainage, iAVS systems are adaptable to different environments and can be built in a variety of settings. For example, if you do not have access to a large plot of land, you can still build an iAVS system using buckets or other containers.

These smaller systems can be placed on balconies or other small spaces and still provide a productive growing environment. In addition, if you do not have access to a reliable source of water, you can still build an iAVS system using manual methods such as bailing with a bucket or calabash.

Alternatively, electric pumps operated by automated timers can be used for larger systems.

When selecting a site for your iAVS system, it is important to consider factors such as sunlight exposure and wind protection. Plants require adequate sunlight for photosynthesis and growth, so it is important to choose a site that receives at least 6 hours of direct sunlight per day.

Wind protection is also important as strong winds can damage plants and disrupt water flow in the system.

2. Design: Once the site has been selected, the next step is to design the iAVS system. The design should take into account factors such as climate, water source, species selection, system size, energy source, maintenance requirements, and cost.

3. Construction: After the design has been finalized, construction can begin. The first step is to excavate the site and create the fish tank and grow bed areas. The tank should be lined with a waterproof material such as EPDM rubber or PVC liner.

4. Plumbing: Once the tank and grow bed areas have been constructed, plumbing can be installed to circulate water between the two areas. A pump is used to move water from the fish tank to the grow beds where it is filtered by plants before returning to the fish tank.

5. Planting: After plumbing has been installed, plants can be added to the grow beds. Plants such as lettuce, herbs, and tomatoes are commonly grown in iAVS systems.

6. Fish Stocking: Once plants have been added to the grow beds, fish can be stocked in the tank area of the system. Fish such as tilapia or catfish are commonly raised in iAVS systems.

7. Monitoring: After construction is complete and plants and fish have been added to the system, it is important to monitor water quality parameters such as pH levels and ammonia levels on a regular basis. This will help ensure the health of both the fish and plants.

Building an iAVS system requires careful planning and attention to detail, but can be a rewarding way to grow fish and vegetables in a sustainable and efficient manner. By following these steps, growers can create a productive and sustainable iAVS system.

iAVS systems are relatively simple to build and require only a few basic materials. However, careful consideration should be given to the design of the system to ensure optimal performance.

Here are some of the materials needed to build an iAVS system, along with design considerations and other important factors to keep in mind.

1. Sand Bed Material

The primary material needed for an iAVS system is a medium-coarse sand bed material. This sand should be free of contaminants and have a particle size between 0.5mm and 2mm. The sand bed should be at least 30cm deep, but can be deeper depending on the size of the system.

2. Water Source

An iAVS system requires a reliable source of water for irrigation and fish tank replenishment. This can be from a municipal water supply or from a well or other natural source.

3. Fish Tank

A fish tank is required for an iAVS system as it provides nutrients for plant growth through fish waste. The size of the fish tank will depend on the size of the system, but should be large enough to support a healthy population of fish.

4. Piping and Valves

Piping and valves are used to transfer water between the fish tank and sand bed, as well as for drainage purposes. These components should be made from durable materials such as PVC or ABS plastic.

Design Considerations:

- Site selection: Choose a site that has access to a reliable source of water, is level, has good drainage, receives adequate sunlight, and is protected from strong winds.

- System size: Determine how much space you have available for your iAVS system and choose an appropriate size based on your needs.

- Plant selection: Choose plants that are suitable for growing in sand beds such as leafy greens, herbs, tomatoes, and peppers.

- Fish selection: Choose fish that are suitable for aquaponics such as tilapia, catfish, or trout.

Other Important Factors:

- Maintenance:

Regular maintenance is required to keep the system running smoothly. This includes monitoring water quality, checking for clogs in the sand bed, and maintaining proper fish health.

- Cost: While iAVS systems are relatively inexpensive to build compared to other growing systems, there are still costs associated with materials and ongoing maintenance.

- Community: Joining an iAVS community can provide valuable support and advice from experienced growers.