"Autumn pheasant" refers to the artificial breeding of squid in autumn. Under normal circumstances, squid will naturally spawn and hatch in the spring and summer seasons without having to use drugs to stimulate. However, in order to meet production and management needs and to make full use of paddy fields and shallow ponds in winter season, “Autumn Grasshopper†has gradually become a popular production variety. The main points of artificial propagation technology and its precautions are briefly described as follows:
First, the choice and cultivation of pro-species. Unlike other domestic fish, carp varies in surface color from male to female. People in some places like the "light red" or "yellowish" squid to show "red wang", then broodstock should be selected in full red, no other variegated species; some people like the "green" squid to reduce If the natural enemies infringe, then the broodstock should be matched with the female and male species. Specific measures should be made according to local conditions. With fast growth and few diseases, the people like to choose for the starting point. However, the pro-species must require long, robust, disease-free, female body weight more than 2 kilograms, male weight 0.75 kilograms or more.
After the selection of the parent species, the male and female broodstock should be reared and reared in separate ponds (preferably kept in a fry pool). The female broth is fed with appropriate grain buds or peanut bran (about 4% of the fish's weight) every day. Female fish ponds should flush water once every 3 to 5 days to promote their gonads to mature.
Second, antenatal preparations. In addition to cultivating broodstock before hatching, “Autumn Grasshopper†also needs to do the following tasks.
1. The fry cultivation pool should be cleaned and disinfected first to ensure that the fish eggs (fish flowers) are innocent and innocuous when ponds fall.
2, oxytocin should be ready, including pituitary (PG) LRH-A2, or DOM and other oxytocin drugs.
3. Spawning grounds and fish nests should be ready. Spawning grounds can be used for spawning ponds or small tanks for convenient drainage and irrigation. They can be used after being cleaned. Fish nests can be made of water-trees or browns of branches, branches, or roots, as long as they can stick to fish eggs but are non-toxic and easy to handle, but they should be exposed to light or disinfected before use.
Third, artificial hatching. The so-called "artificial hatching" is the whole process of artificially spawning and ejaculating the broodstock, and then incubating the fertilized egg to make it into a fish flower. When the “Autumn Sea†hatches, the broodstock should first be inspected, and milky white semen should be shed when the abdomen is lightly pressed; the abdomen of the female fish is plump, the anus is micro-infrared convex, and the egg size is uniform and yellow-green. Glossy, not clumpy, easy to separate, such broodstock can choose to use production. Secondly, the ratio of male to female should be 1:3. The fertilization rate and the emergence rate can be adapted to the physiological requirements. In addition, an appropriate amount of hormones is produced. Incubation "Qiu Qi" can be used twice injection or one injection method. In general, if the maturation of the female broodstock is slightly poor, the use of the second injection method is better; the first needle male and female can use the LRH-A220 international unit/tail, every 6-8 hours, and then the second injection, female Each kilogram of fish used 1 (grain) PG + 40 micrograms LRH-A2 + 2 milligrams of DOM, male fish each endnotes 50 micrograms of LRH-A2, when the water temperature 28-30 °C, after 6-8 hours can spawn. One injection method is to inject the above-mentioned two-needle medicines at one time. The better ones are bred, and the desired results can also be achieved. Fourth, timely transfer of fish nests. When the eel's spawning is completed, its nest should be transferred in time so that the pro-fish can not eat and cause loss. Fish nests should be placed in fresh water, unpolluted pond water incubating, or catch broodstock in the original spawning pond, and inject 80-100 cm deep water to produce seedlings in situ. The method can be selected.
Fourth, anti-violent protection against predators. As the water temperature in autumn is high (the pond water temperature is sometimes as high as 34°C or more), quail eggs are liable to suffocate and die, resulting in a low hatching rate. Therefore, the best choice for hatching “Autumn Grasshopper†is in rainy weather or a shaded summer resort where the water temperature is low. Water blisters, otters, etc. are the main predators of the autumn cricket and eat many young fry every day, resulting in a low survival rate. The prevention method is: Disinfect the pond prepared to cultivate the fry, and after the seedling emergence, spray the 0.1-0.2ppm solution of trichlorfon to the pond for 3-4 days, which can also achieve the purpose of prevention.
First, the choice and cultivation of pro-species. Unlike other domestic fish, carp varies in surface color from male to female. People in some places like the "light red" or "yellowish" squid to show "red wang", then broodstock should be selected in full red, no other variegated species; some people like the "green" squid to reduce If the natural enemies infringe, then the broodstock should be matched with the female and male species. Specific measures should be made according to local conditions. With fast growth and few diseases, the people like to choose for the starting point. However, the pro-species must require long, robust, disease-free, female body weight more than 2 kilograms, male weight 0.75 kilograms or more.
After the selection of the parent species, the male and female broodstock should be reared and reared in separate ponds (preferably kept in a fry pool). The female broth is fed with appropriate grain buds or peanut bran (about 4% of the fish's weight) every day. Female fish ponds should flush water once every 3 to 5 days to promote their gonads to mature.
Second, antenatal preparations. In addition to cultivating broodstock before hatching, “Autumn Grasshopper†also needs to do the following tasks.
1. The fry cultivation pool should be cleaned and disinfected first to ensure that the fish eggs (fish flowers) are innocent and innocuous when ponds fall.
2, oxytocin should be ready, including pituitary (PG) LRH-A2, or DOM and other oxytocin drugs.
3. Spawning grounds and fish nests should be ready. Spawning grounds can be used for spawning ponds or small tanks for convenient drainage and irrigation. They can be used after being cleaned. Fish nests can be made of water-trees or browns of branches, branches, or roots, as long as they can stick to fish eggs but are non-toxic and easy to handle, but they should be exposed to light or disinfected before use.
Third, artificial hatching. The so-called "artificial hatching" is the whole process of artificially spawning and ejaculating the broodstock, and then incubating the fertilized egg to make it into a fish flower. When the “Autumn Sea†hatches, the broodstock should first be inspected, and milky white semen should be shed when the abdomen is lightly pressed; the abdomen of the female fish is plump, the anus is micro-infrared convex, and the egg size is uniform and yellow-green. Glossy, not clumpy, easy to separate, such broodstock can choose to use production. Secondly, the ratio of male to female should be 1:3. The fertilization rate and the emergence rate can be adapted to the physiological requirements. In addition, an appropriate amount of hormones is produced. Incubation "Qiu Qi" can be used twice injection or one injection method. In general, if the maturation of the female broodstock is slightly poor, the use of the second injection method is better; the first needle male and female can use the LRH-A220 international unit/tail, every 6-8 hours, and then the second injection, female Each kilogram of fish used 1 (grain) PG + 40 micrograms LRH-A2 + 2 milligrams of DOM, male fish each endnotes 50 micrograms of LRH-A2, when the water temperature 28-30 °C, after 6-8 hours can spawn. One injection method is to inject the above-mentioned two-needle medicines at one time. The better ones are bred, and the desired results can also be achieved. Fourth, timely transfer of fish nests. When the eel's spawning is completed, its nest should be transferred in time so that the pro-fish can not eat and cause loss. Fish nests should be placed in fresh water, unpolluted pond water incubating, or catch broodstock in the original spawning pond, and inject 80-100 cm deep water to produce seedlings in situ. The method can be selected.
Fourth, anti-violent protection against predators. As the water temperature in autumn is high (the pond water temperature is sometimes as high as 34°C or more), quail eggs are liable to suffocate and die, resulting in a low hatching rate. Therefore, the best choice for hatching “Autumn Grasshopper†is in rainy weather or a shaded summer resort where the water temperature is low. Water blisters, otters, etc. are the main predators of the autumn cricket and eat many young fry every day, resulting in a low survival rate. The prevention method is: Disinfect the pond prepared to cultivate the fry, and after the seedling emergence, spray the 0.1-0.2ppm solution of trichlorfon to the pond for 3-4 days, which can also achieve the purpose of prevention.