General Questions
What is aquaponics?
Aquaponics is a sustainable food production system that combines aquaculture (raising fish) with hydroponics (growing plants in water). Fish waste provides natural fertilizer for plants, while plants filter and clean the water for the fish. It's a closed-loop ecosystem that uses up to 90% less water than traditional farming.
What's the difference between aquaponics and hydroponics?
Hydroponics grows plants in water with added nutrient solutions (synthetic fertilizers).
Aquaponics uses fish waste as natural fertilizer, eliminating the need for synthetic nutrients. It's a complete ecosystem with fish, beneficial bacteria, and plants working together.
Is aquaponics organic?
Aquaponics is naturally organic since it relies on fish waste rather than synthetic chemicals. However, official "organic" certification depends on your local regulations and may require additional documentation.
Getting Started
How much does it cost to start an aquaponics system?
A basic DIY home system can cost $200-500 for materials. Commercial systems range from $10,000 to $100,000+ depending on scale. Starting small is recommended for beginners.
What fish are best for aquaponics?
Popular choices include:
- Tilapia - Hardy, fast-growing, edible
- Goldfish - Great for beginners, ornamental
- Koi - Cold-tolerant, ornamental
- Catfish - Tolerant of varying conditions
- Trout - For cooler climates
What plants grow best in aquaponics?
Best plants for aquaponics:
- Leafy greens - Lettuce, spinach, kale, Swiss chard, arugula, bok choy
- Herbs - Basil, mint, cilantro, parsley, chives, oregano, dill
- Brassicas - Cabbage, broccoli, cauliflower (in mature systems)
- Fruiting plants - Tomatoes, peppers, cucumbers, beans, peas (need established systems with high nutrient levels)
- Other - Watercress, microgreens, wheatgrass, strawberries
Tip: Start with leafy greens - they're the most forgiving and grow fastest. Once your system is mature (6+ months), try fruiting plants.
What plants should I avoid in aquaponics?
Plants NOT suitable for aquaponics:
- Root vegetables - Potatoes, carrots, beets, turnips (roots rot in constantly wet media)
- Acid-loving plants - Blueberries, azaleas, rhododendrons (need pH 4.5-5.5, aquaponics runs 6.8-7.2)
- Large trees - Fruit trees are too large and heavy for grow beds
- Corn - Requires too much space and nutrients relative to yield
- Melons & squash - Possible but need lots of space and support, better suited for soil
Why these don't work: Aquaponics maintains a near-neutral pH (6.8-7.2) for fish health. Plants requiring acidic soil won't thrive. Root vegetables need dry periods that flood-and-drain systems don't provide.
What pH level should my aquaponics system be?
The ideal pH for aquaponics is 6.8 to 7.2. This is a compromise between:
- Fish: Prefer pH 7.0-8.0
- Plants: Prefer pH 5.5-6.5
- Bacteria: Work best at pH 6.0-8.0
Test pH daily when starting out, then weekly once stable. Use pH Up (potassium hydroxide) or pH Down (phosphoric acid) to adjust.
How long does it take to grow vegetables in aquaponics?
Plants typically grow 25-50% faster in aquaponics compared to soil. Approximate times:
- Lettuce: 30-45 days
- Basil: 28-35 days
- Spinach: 40-50 days
- Kale: 55-65 days
- Tomatoes: 60-80 days (to first harvest)
- Peppers: 70-90 days
Can I grow indoors year-round?
Yes! Indoor aquaponics with grow lights allows year-round production regardless of climate. You'll need:
- LED grow lights - 12-16 hours per day for most vegetables
- Temperature control - Keep water 65-85°F depending on fish species
- Ventilation - Prevent humidity buildup and ensure CO2 circulation
Indoor systems are popular for apartments, schools, and cold climates.
How often should I feed my fish?
Feed fish 2-3 times daily, only what they can consume in 5 minutes. Uneaten food pollutes water and harms fish.
Rule of thumb: Feed fish approximately 1-2% of their body weight per day, split into multiple feedings.
Important: More fish waste = more nutrients for plants. Balance your fish/plant ratio - typically 1 pound of fish per 5-10 gallons of grow bed.
Troubleshooting
Why are my plants turning yellow?
Yellow leaves usually indicate nutrient deficiency:
- Nitrogen deficiency - Older leaves yellow first (add more fish or feed more)
- Iron deficiency - New leaves yellow with green veins (add chelated iron)
- Potassium deficiency - Leaf edges brown and curl
Check your fish population - you may need more fish to supply nutrients, or your system may be too new.
My fish are dying - what's wrong?
Common causes of fish death:
- Ammonia spike - Test water immediately. Above 1 ppm is toxic
- Low oxygen - Add more air stones or surface agitation
- Temperature shock - Sudden changes stress fish
- Chlorine - Always dechlorinate tap water before adding
- Overfeeding - Uneaten food rots and pollutes water
Do a 25% water change immediately if fish are stressed, and test your water parameters.
About This Website
Are you the original Endless Food Systems company?
No. Endless Food is an educational resource. We acquired this domain to provide free educational content about sustainable growing.
Do you sell aquaponics systems?
No, we don't sell products. We provide free educational articles to help you learn about and build your own systems. Check our DIY Guides section.
Can you help with my old Endless Food Systems kit?
Unfortunately, we cannot provide support for products sold by the original company. However, our articles cover general aquaponics maintenance that may help with troubleshooting.