koi fry rearing
koi fry rearing
A concrete pond 30 centimetres deep is sufficient for the fry. It is necessary to grow Daphnia in the pond before the fry are put in it. The day when the fry begins to eat daphnia and the day when Daphnia begins to grow are to be the same. Preparation for growing Daphnia should begin two weeks before the expected day of spawning.
The preparation is as follows.
Dry the pond under the sun and sprinkle lime to disinfect the pond. After two days fill the pond with water put dried fowl droppings wrapped with a straw mat under water. Fix it with a heavy stone in the corner of the pond. Infusoria, vegetable plankton such as chlorella and other bacteria will breed first in ten days Daphnia will begin to grow. If not, put some Daphnia starter culture they will increase rapidly.
When fowl droppings are put in the water it becomes brownish red, but it gradually gets transparent. Then Daphnia increases. It is the time to put the fry in the pond.
10 kilogrammes of fowl droppings per 7square meter is sufficient. If they are put too much, Daphnia does not begin growing soon, but they continue to increase long. If they are too little, Daphnia begins to grow shortly but disappear soon.
Recently yeast is used for growing Daphnia instead of fowl droppings. 3 to 4 kilogrammes of yeast per 1 is sufficient. In this case, Daphnia comes out in two days but do not increase for a long time. So yeast should be supplied little by little. Yeast. can be added to fowl droppings, when Daphnia do not increase much.
After being hatched. the fry begins to eat vegetable plankton, Infusoria and fresh Daphnia to grow up. When they get larger, they eat imagoes of Daphnia. After a month of feeding them Daphnia, it is all right to begin artificial food.
In case Daphnia never grows, artificial feed, fine boiled egg yolk, is useful. Dried Daphnia, powdered shrimps, milk or dry milk powder and powdered feeds too. It is necessary to take care not to decompose water on giving them to koi