Aquaponics Fish Breeding
To keep your system simple, you can just purchase new young fish after each harvest to keep your population going. But to maximize your production, you should try to allow your fish to breed. That's a constant supply of truly free fish. It's the more self-sufficient approach as well as being more cost-effective.
Tilapia are known to be very easy breeders for the novice, and would be a good place to start. You'll have to do further research into your specific species to see their requirements for successful breeding. Bluegill, for example, need substrate materials to build a kind of nest for their eggs.
Once your school starts to multiply, you will have to remove the fry and fingerlings to their own tank if you are keeping anything but herbivorous fish. Carnivores and even some omnivores will happy devour any young that catch their eye.
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