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Many different kinds of fish work well. For small growers, and possibly large as well, one of the most popular species is tilapia. Tilapia are not perfect, because they need to be kept a little warm, but they are very hardy otherwise, they can be bred easily, and they grow very fast.
Some people grow goldfish in aquaponics systems. Most often these people are not interested in eating the fish, but keep them for the nutrients they put into the water. Goldfish are very hardy, and can take very cold water, even water that is icing over. They also breed rather easily.
Other fish work as well. I know people who keep minnows, which can be used for bait. I know people who have eaten them. Many of them are very like goldfish in their care.
I would definitely not start with trout, which require a lot of high-protein food and will not tolerate warm water. Commercial growers might raise tilapia in the summer and trout in the winter.
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Is aquaponics better than hydroponics?
Whether hydroponics or aquaponics is better depends on what you want to do, and how much time and effort you want to be involved in. Hydroponics is easier to learn about and requires less equipment. It cannot grow as much food, because the aquaponics system grows about the same amount of vegetables and adds fish to that. Also, if you want to grow your own organic vegetables, it is hard to do it with hydroponics. Aquaponics requires more knowledge, and more care. In addition to tending vegetables, it is necessary to keep track of fish, making sure their living conditions suit them. Fish tanks, plumbing, pumps, and so on, are likely to be included in the design. The amount of fish you get can be about half of the amount, in weight, you get in vegetables, if you are set up right. You have excellent control over the quality of the food as well, and if you want it to be organic, that is not particularly hard to do.
What volume of water is necessary to provide a stable aquaponics system?
I have seen aquaponic systems with as few as ten gallons. The important thing is not the size, but the balance between the volume of fish water and growbed, though there is latitude here, depending on what fish and vegetables are involved. I think the smallest volume that could be used might be for very small fish - perhaps someone could set a system up for guppies in two or three gallons.
How are fish fed in aquaculture?
First of all, it removes fertilizer and chemicals from the agricultural process. The fish waste acts as a natural fertilizer for the crops, instead. Second of all, it saves water because the water is recycled within the tanks rather than sprayed across a field of crops with abandon. Thirdly, an aquaponics environment can be set up anywhere, so it reduces the need for local communities to import fish and crops from other countries.
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