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(b) The cultivation of fingerlings for fingerling cultivation should adopt monoculture and the water depth can be maintained at 80 cm. For each 0.067 hectare, it is advisable to put 6000 - 8,000 tails of 3 - 4 cm in length. During the cultivation, the fish feed compounded feed (broken pellets) is mainly used, and the vegetable feedstuffs such as pudding, bean cake or bean dregs are auxiliary-fed. According to the season, weather and other conditions, they are fed 3 to 4 times a day, and the amount of fish fed is within 10 to 15 minutes. The pool water management should be stepped up in peacetime to make the pool water clean and fresh, and take precautions against disease and damage.
(C) The selection of young fish is generally started when the juvenile grows to 3--6 cm, and proceeds three to four times successively. Due to different breeds, the speed of growth and the timing of the appearance of markings vary from time to time. For example, the Showa tricolor Koi carp is selected when it is hatched for more than two weeks; the Koi system of the gold system is selected for 50 days; and the Koi carp of the red-white system and the Taisho three-color system are selected for about 60 days.
The point of selection: First remove the deformed, colorless fish. According to the growth pattern of the pattern and the standard of good or bad quality, the red and white koi, the red stripe color should be eliminated; the golden koi's head is dull, the scales are not well covered, the fish body has many spots, and the pectoral fins If you do not grow well, you must eliminate them. The elimination rate of Koi in the feeding process is relatively high. Generally, one broodstock fish lays 200,000-400,000 eggs. After hatching, it is selected several times. Finally, approximately 5,000 finished products are available. Koi is a large-scale fish and has edible value. The fry that has been selected and culled several times can be reared for food fish.
The selected Koi fish fry have the excellent characteristics of Koi fish and can be sold as ornamental fish to the market. To develop large-scale fish, the farms can be cultured in ponds, and families can use aquaculture for viewing.
(Agricultural Bureau, Heshan District, Yiyang City, Hunan Province, China. 2 Lanxi Town Secondary School, Heshan District, Yiyang City, Hunan Province, China Postcode: 413002)
(Bears into 1 Yuan Weixian 2)
Breeding and juvenile selection techniques for Koi carp
(1) Fry seedlings The newly hatched fingerlings are soaked in the wall or in the fish's nest. They do not eat, and they rely on the absorption of the yolk of the abdomen as a nutrient. After 3-4 days, the fry began to swim freely and feed. At this time, live rotifers such as rotifers, paramecium, amoebae, and unicellular algae should be fed. In the absence of live baits, cooked egg yolks can be fed. When the larvae grow to more than 1 cm after 7-10 days, the fish nests are removed, and small fish worms, big rotifers, etc. are fed. The fish fry pools should constantly keep fresh bait. When the fry grows to 2 to 3 cm, clean up and change the water every 5 to 7 days. When water is added, add slowly along the wall of the container to avoid damaging the seedlings. The bait may be mixed with leeks, yellow mealworms and palatable pellets. .