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Newly hatched baby fish are called fry and when they are finger size they are called fingerlings. With a little extra time and care you can have fingerlings to put in your rice paddies and to sell to other farmers. Here is a way to produce common carp (Cyprinus carpio). You will need two ponds, a spawning pond and a nursery pond. Spawning is when adult fish breed and lay their eggs. A spawning pond is a pond where fish can breed and lay eggs. The spawning pond is also where the eggs will hatch into fish fry.
In the wild, lakes and ponds go through climate changes. Koi carp can exist in freezing waters but prefer warmer water between 82F and 84F degrees. If you put a heater in your pond, koi carp will be active all year long. Water in the koi carp's natural environment should be a hard water, with high levels of minerals and slightly alkaline with the PH of 7 to 8.5. In the wild, carp like dirty water but for water gardeners and koi keepers, clearer water is preferred in order to see the fish. It is difficult and expensive to keep pond water crystal clear.
The common carp is an omnivorous feeder, which means that it eats pretty well everything – both plant and animal-based. There are some that say the carp is in fact the "pig of the pond" because it digs around on the bottom of the pond in the mud looking for anything it can find to eat. It also gobbles whatever is floating about in or on the water. Carp will devour anything from microscopic plankton and oxygenating water weeds, to worms and the larvae of insects.
Originally posted by Evolutionsend