1. Feeding the newly hatched fish fry, body length 0.2 ~ 0.3 cm, by absorbing the yolk sac in the nutrient life. Two to three days after hatching, the nutrients in the yolk sac are absorbed and the digestive system of the fish has been fully developed. The fish gills are full of gas and the fry begin to swim in all directions and feed. For these newly hatched fry, zooplankton, which are rotifers and ciliates, should be fed in a dosed manner. If there is no “drip,†you can feed cooked egg yolks by wrapping the yolks with 1 or 2 layers of gauze and squeezing them. After that, place the gauze on the surface of the water, tap it and move it to make the egg yolk evenly suspended. Water, for fish consumption. Feed twice a day, and the amount fed should be within 1 hour. After feeding for 7 to 10 days in this way, the fry is getting bigger and you can stop feeding the egg yolk and change it to feed live leeches. When the fry grows to more than 1 cm, it can be fed with various rotifers.
2. After the hatching fish fry hatches, the daily food leftovers accumulate in the water. Corruption will affect the life of the fry, so it is necessary to change the water. Change the water to use dehydration method, that is, when changing the water, pour the fish into the new water together with the clear old water. The first dehydration is performed approximately 10 to half months after hatching, and once every other half month thereafter. After three dehydration fry, the total length has reached 2 centimeters, and the water should be changed. Since the fish's resistance is weak, it is advisable to change the water temperature to keep it within 4°C.
3. Fish selection and sub-pooling In the growth process of fry, according to the characteristics of various farmed fish, we should continue to select superior and inferior to ensure the development of superior varieties. In general, one species of broodstock is retained, and it takes approximately 4 to 5 selections to meet the requirements. The criteria and methods of selection are as follows:
The first selection of fish, hatching for 10 days to half a month, fish body length of about 1.5 cm, you can start to choose, mainly out of single-tailed, malformed tail and caudal handle who are not correct. After the fish is selected, the good fish left are stocked at a density of about 150 fish per square metre.
In the second fish selection, caudal fins were formed when the fry grew to more than 2 cm. All fish that do not have 3 tails and 4 tails will be eliminated.
The third fish was selected to eliminate fish with underdeveloped dorsal fins. The fish left behind were stocked at a density of about 120 fish per square metre.
In the 4th and 5th fish selections, the fry have grown into juvenile fish, which can be selected based on the characteristics of the variety and the main form. Such as the dragon's eye, the left and right eyeballs should be the same size; bubble eye bubble should be large, left and right symmetry and so on.
2. After the hatching fish fry hatches, the daily food leftovers accumulate in the water. Corruption will affect the life of the fry, so it is necessary to change the water. Change the water to use dehydration method, that is, when changing the water, pour the fish into the new water together with the clear old water. The first dehydration is performed approximately 10 to half months after hatching, and once every other half month thereafter. After three dehydration fry, the total length has reached 2 centimeters, and the water should be changed. Since the fish's resistance is weak, it is advisable to change the water temperature to keep it within 4°C.
3. Fish selection and sub-pooling In the growth process of fry, according to the characteristics of various farmed fish, we should continue to select superior and inferior to ensure the development of superior varieties. In general, one species of broodstock is retained, and it takes approximately 4 to 5 selections to meet the requirements. The criteria and methods of selection are as follows:
The first selection of fish, hatching for 10 days to half a month, fish body length of about 1.5 cm, you can start to choose, mainly out of single-tailed, malformed tail and caudal handle who are not correct. After the fish is selected, the good fish left are stocked at a density of about 150 fish per square metre.
In the second fish selection, caudal fins were formed when the fry grew to more than 2 cm. All fish that do not have 3 tails and 4 tails will be eliminated.
The third fish was selected to eliminate fish with underdeveloped dorsal fins. The fish left behind were stocked at a density of about 120 fish per square metre.
In the 4th and 5th fish selections, the fry have grown into juvenile fish, which can be selected based on the characteristics of the variety and the main form. Such as the dragon's eye, the left and right eyeballs should be the same size; bubble eye bubble should be large, left and right symmetry and so on.
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