Angelfish (Pterophyllum eimekei), also known as frogfish, finfish, angelfish, etc., belongs to the genus Cichliidae and Angelfish. It originally lived in the Amazon Basin and is a tropical fish with high ornamental value. Queen's name. The author made a preliminary exploration of the breeding and breeding methods of the red-eye angelfish of the Goldeneye, and it is summarized as follows. First, the conditions and methods 1. Broiler sources Angelfish broodstock need to "children" since childhood pairing. The author purchased angelfish broodstock from a family of amateur fish lovers in Beibei District of Chongqing Municipality. It was 15 cm in length and 17 cm in height. It had complete body surface, strong swimming ability and good growth. 2. The broodstock female and male identify the mature female's head to be smooth and the abdomen expands; and the mature male's head is raised and the abdomen is normal. Before laying eggs, the angelfish come out of the ovulation tube or ejaculatory tube (also known as milk tube), and the size and shape of the male and female angelfish milk tube also differ greatly. 3. Broodstock Breeding The breeding and spawning facilities in this experiment are the same aquarium with a size of 65 cm, 40 cm and 35 cm. The water temperature is controlled at 25-27°C, pH 6.6-7.1. A small amount of round-leafed black algae and valerian are planted on the bottom of the box to beautify the environment inside the box and facilitate the habitat of fish. The bait is mainly made up of fresh leeches, supplemented by copepods and horns, and fed regularly three times a day. Feeding quantity is based on "seven-point fullness", and the input of leeches is completed within ten minutes. One-fourth of the water is changed daily, and the bottom dung and food residue are sucked out with a straw. The newly added water is tap water that has been aerated for more than three days. 4. Breeding of broodstock (1) Egg-laying Angelfish has a strong breeding ability, spawning once every two weeks or so, and spawning itself does not require oxytocin production. When broodstock are found to have ovipositing precursors, such as when the abdomen of the female fish is swollen and even extends out of the milk tube, the spawning board (green thin plastic material) is laid down. The broodstock is quickly found after the laying of the spawning board, and is positively brushed with the mouth. On the surface, at the same time, the broodstock's milk tube continues to grow. When it reaches the status of labor, the female milk tube is about 2 mm, and the male fish is about 1.5 mm. The females produce a row of eggs on the spawning board. The males are inseminated immediately after the females are bred. This repeats until the end of production and each spawns 200 to 1200 eggs. (2) The hatching of fish eggs can adopt natural hatching and artificial hatching. The natural hatching is relatively simple, that is, the eggs are left in the hatchery box to hatch. The broodstock will take care of the eggs. In the process of hatching, male and female fish take turns to use the pectoral fins to feed eggs, and the fish eggs move around to promote the exchange of water, so that the fertilized eggs have enough oxygen to meet the needs of embryonic development. If you find that the white eggs that are not fertilized eggs will be eaten with your mouth. When the juveniles hatch out of the membrane, the broodstock can be fished out. Artificial hatching is a more commonly used method. When the broodstock spawning behavior ends, the spawning board is moved to the incubator. The water temperature of the incubator and the spawning box were the same and were pre-sterilized with a 25 mg/L malachite green solution. At the same time in the incubator set a small oxygenation pump, play the role of brooding fish. During hatching, if there is a whitish dead egg, it should immediately be sucked out with a straw to avoid infecting the water mold. At the same time, the temperature should be kept constant. Second, the test results Spawning from March 1, 2000 to May 22, a total of 5 eggs, an average of 15 days spawning time, using artificial gasification hatch. When the water temperature was between 27 and 30 °C, the angelfish could hatch eggs. However, from the comprehensive analysis of the two indicators of fertilization rate and hatching rate, the water temperature was better at 28.5 to 29.5°C. Third, the discussion 1. Comparison of two hatching methods are currently more artificial inflatable hatching method, because it has the following advantages compared to natural hatching. First, it keeps the broodstock in good condition. Because the natural hatching of broodstock takes care of the development of fertilized eggs, it consumes a part of energy and does not like to eat. Secondly, fertilized eggs are not easily infected with water mold, and the fertilization rate is higher than natural hatching. Finally, natural incubation requires that the surrounding environment is absolutely quiet, otherwise the broodstock will be frightened and will eat the eggs, but this will not happen if the hatched broodstock and eggs are isolated. 2. Incubation conditions Angelfish are different from other tropical fish and require stricter incubation conditions. The discomforts of indicators such as water temperature, pH, hardness, disinfectant, and inflation conditions may all cause the entire process to fail. The author through several tests to get the following parameters indicators: water temperature 28 ~ 30 °C, pH 6.7 ~ 7.0, hardness 7 ~ 9; disinfectant can be 1% ~ 2% of salt solution or 0.3 ~ 0.7 mg / l malachite green Pool spilled. If the disinfection dose is too low, it is very easy to infect the water mold and cause a large number of dead eggs or even all deaths. If the disinfection dose is too high, the juveniles will be deformed. The diet of larvae and juveniles was mainly paramecium, rotifer, copepods, nauplii, small branches, large branches, and copepods. Its open bait has a small particle size, and its dietary conversion is faster. Artificially cultivated live bait often causes dead fish due to unsynchronized diet. In particular, paramecium and rotifers are quite critical. The fish is very immature, and too much or too little bait is not acceptable. Many experimental larvae died at this stage. In this regard, further research is needed.
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