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Preliminary Study on Breeding of American Carp Seedlings
Due to environmental deterioration and overfishing in the Yangtze River squid in China, it has been difficult to see wild populations since the late 1980s. In order to explore the possibility of cultivation of this valuable species of bonito, in June 2003, we introduced 30,000 fertilized hatchlings from the same latitude for incubation and breeding experiments, and achieved certain test and production results. By January 2004, Squid grows well and individuals have reached 15 centimeters. The current situation of aquaculture and testing is described as follows: 1. Carp fertilized egg transport and hatching 1. Fertilized eggs transported Carp fertilized eggs from North America are transported by air to Shanghai, using a bag of oxygenated oxygen and ice, respectively. On June 7, 2003 and June 23, 2003, two fertilized eggs were returned from the sea and 30,000 eggs were fertilized with 5,000 eggs per bag. At that time, the maximum temperature was around 30°C. The air-conditioned vehicle was cooled down to 22°C on the way. When it was transported for more than two hours, only a small amount of fertilized eggs died. 2. Fertilized egg hatching Fertilized egg hatching adopts two forms of cone-shaped hatching tank aerated oxygen and hydrostatic hatching. The static water hatching adopts indoor cement pool and outdoor soil pool. The cement tank size is 25 meters and 10 meters, and the earth pool is 110 meters and 60 meters, hatching tanks and cement tanks each placed a bag of fertilized eggs, soil pool put four bags, the results were successful. On the third day after the return of the fertilized eggs, the eel fry began to form a film, which basically came out on the fifth day, and then the fry in the hatchery was transferred to a cement pool for cultivation. Due to the long transportation time and the ice on the way, the hatching rate of fertilized eggs is not high, averaging about 30%. There is no significant difference in the hatching rate of the three methods. Second, seedlings Breeding carp seedlings are cultivated at the same time indoors and outdoors. The indoor uses 250 square meters of cement pool, water depth is about 1 meter, outdoor in 10 acres of earthen ponds, water depth 3-5 meters. Both areas have undergone a rigorous clear pond treatment, and then the water of the Yangtze River has been introduced for early water quality cultivation. The indoor pool has 3,000 seedlings and the outdoor pool has about 6,000 seedlings. On the second day after the fish is released from the membrane, it is fed with 60 mesh sieve-filtered egg yolk. After one week, it is replaced with homemade microgranules. It is fed once a day in the morning and once in the afternoon, each time 100 grams, and then it is filled with squid puffed buoyancy. Expected to increase by 200 grams per month until 1 kg per feeding at winter. At ordinary times, the aquaculture water body will be replaced with oxygen and water, changing water by 1/3 a week to keep the water fresh. In the indoor cement pool feeding site, irregular suction was performed depending on the actual situation, and no drugs were used during the entire first-year carp breeding period. By the end of December, when the carp entered the greenhouse, nearly 4,000 of the pots had survived and the survival rate was 65%, while the survival rate of the seedlings in cement pots was above 90%. Third, during the winter period, the first-year-old carp fingerlings are cultured until late December. When the water temperature is 2-4°C, the scale-finishing death phenomenon occurs in the carp fingerlings in outdoor earthen ponds, ranging from one-to-one at the end of the day to as many as several dozen. In order to suffer from frostbite after frostbite. We will pull the nets and dry ponds for fishing. Discard the remaining carp fingerlings with salt water and transfer them to the overwintering greenhouse. First introduce cold water outside to avoid excessive temperature difference when the carp enters the pond. Then use the method of directly heating the water. Gradually raise the temperature to 18-19°C. One week later, the carp stopped dying and grew well and started to eat. The carcasses in the original indoor cement pool did not suffer freezing deaths, but there were bruises. IV. Results and Discussion 1. The carp fingerlings were about 13-15 cm long before they were overwinter and weighed 30-50 grams, with a few individuals. It is more than 100 grams, indicating that North American salmon can fully grow normally from June to December in Jiangyin area, but it should be moved into the greenhouse for winter in mid-December each year to ensure the survival rate of American salmon species. 2. Keep fresh water and sufficient dissolved oxygen in carp culture. The early breeding of carp should not use sink feed, and it is better to use buoyant puffed grain feed. As the fish grows, the particle size gradually increases. 3, squid swiftness, swimming fast food speed, should try to avoid changing the pool and pull the net operation, the pool should be set up as few obstacles to prevent squid descaled due to bruises, and then cause death. The early culture should be suitable for breeding at normal temperature. In the winter, winter can be used to directly seal the facilities on the surface of the pool to reduce the operation of the squid exchange, in order to improve the survival rate of the squid culture.
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