Question 2: how many river shrimp seedlings can be reproduced in an acre 1, bi-seasonal culture: before the end of February mu stocked with autumn propagation of shrimp species (specifications 1000-1600 tails / kg) 10-15 kilograms, June-July dry ponds to harvest the end of the dry pond; dry pond clearing acres of green shrimp seedlings 35-45,000 tails (or 0.75-1.0 kilograms of shrimp holding eggs).
2, a one-time stocking anniversary farming (choose one):
(1) stocking shrimp seedlings, each put 5-6 million tails, scale 1.5 cm or more, the time is appropriate in June-July;
(2) stocking shrimp seeds, mu put 20-25 kg, scale 1000-1600 tails / kg, the time is appropriate in December-February;
(3) Stocking of spawning shrimp, mu put spawning shrimp 2-3 kilograms.
Question 3: How to artificially raise river shrimp? River shrimp that is the green shrimp, the scientific name of the Japanese marsh shrimp. Now introduces the relevant technology. First, artificial nursery technology. 1, the selection of parent shrimp. Parent shrimp can be caught in natural water bodies, but also in the breeding of shrimp in the selection of individuals who have reached sexual maturity. Selected shrimp should be limb sound, disease-free, injury-free, strong vigor, gonadal development and full, body length of 4 cm or more. 2, shrimp overwintering management. December each year to March of the following year is the overwintering period of green shrimp, available ponds or net box overwintering: pond area of 1 to 2 acres, to maintain a water depth of 1.5 meters or more; net box area of 50 to 100 square meters, depth of 1.2 meters, pond ponds within the water peanuts, water hyacinth and other aquatic grasses, nets can be put in some of the brown pieces, willow roots or other aquatic grasses. Stocking density: 5 to 10 tails per square meter in the pool, 15 to 20 tails in the running water or aerated pool. Overwintering shrimp rarely active, occasionally out of feeding, can be put some concentrate feed from time to time. The key is to maintain water quality and prevent hostile. 3, incubation. (1) pond incubation: pond area of 0.5 to 2 acres, water depth of 1 to 1.5 meters, the substrate to mud and sand is good, floating mud should not be too much. Pool planting some fertilizer-resistant submerged plants, accounting for about 1/4 of the surface of the pool, April and May per mu stocking of female shrimp 500 to 800 tails, male shrimp 300 to 500 tails: every 2 days according to the body weight of 5% of the 1 time to throw concentrate feed. In the water temperature of 20 ℃, pregnant shrimp in the pool about 10 days after the first batch of juvenile shrimp hatch. (2) net box hatching: first with a mesh of 196 mesh per square centimeter mesh cloth made of an area of about 70 square meters, 1.7 meters high specifications of the large net box, put 2 to 3 square meters of water plants. In the large box set in two 2 cubic meters of water in the small net box. The mesh is 9 meshes per square centimeter, and a small amount of water plants are placed inside the box. Each net box put holding eggs female shrimp 200 to 300 tails, about 1 week, the larvae hatch out of the small box removed, the large box of larvae with soybean milk 2 times a day, half a month after the addition of a small amount of bran, peanut cake, etc., about 25 days after the seedlings can be produced. (3) indoor pool incubation: cement pool pool depth of 0.8 ~ 1 m, well water is preferred, to maintain dissolved oxygen at 8 mg / l or so, will be a parent shrimp side of the eyestalk from the base of the excision, the cut is sterilized with 70% of alcohol and put into the spawning pool, each cubic meter of water body to put 8 to 10 pairs of shrimp, feed some concentrate feed every day, to be mated spawning in a timely manner after the fish out of the male shrimp. Let hold eggs female shrimp still stay in the pool incubation, until more than 80% of the eggs hatch and then fish out the female shrimp. Splash with soybean milk to fertilize the water, the larvae metamorphosis into young shrimp, put a small amount of rice bran, peanut cake or soybean cake powder, about 1 month cultivation, the shrimp seedlings reach 1.5 ~ 2 cm can be raised out of the pool. Second, feeding management. Green shrimp for crustaceans, intolerant of low oxygen environment, like to live in fresh water, dissolved oxygen-rich waters. When the waters of dissolved oxygen in more than 5 mg / l, the feeding intensity of the shrimp increased, metabolism, rapid growth, and when the dissolved oxygen is less than 2.5 mg / l, the shrimp gradually stop feeding, and even floating head caused by death. Therefore, good water quality management for shrimp ponds, the growth of shrimp to provide a good ecological environment in the waters is critical. Improve water quality management, one is to regularly inject fresh water, generally 1 time per week, each time the water 1 / 3, so that the water transparency of the shrimp pond to maintain more than 40 centimeters. Usually should adhere to the daily dawn patrol pond, carefully observed, found crawling shrimp shore, it should be immediately refilled with fresh water or open the oxygenator oxygen, to prevent floating head dead shrimp. Second, the water should be appropriate and reasonable fertilization. In order to cultivate rich natural bait, shrimp ponds are usually fertilized regularly. Fertilizer is best to apply some lasting and stable organic fertilizers, such as stable manure, compost, mixed compost, etc.. Quick-acting fertilizers such as chemical fertilizers, manure, etc. generally should not be used to keep the water quality fat, live, cool, and promote the growth of shrimp. Clear the pool of green shrimp hostile, is also an important management work. First, before stocking to thoroughly clear the pond, eliminate harmful organisms. Second, to set up in the water intake ditches to stop fish facilities to prevent wild fish from entering. Third, once a month with the summer flower fish species of netting the whole pond trapping 1 time, remove all kinds of fish species. Fourth, we must find ways to kill water snakes, water rats, drive away the water crows, do everything possible to improve the survival rate of shrimp. Prawns are particularly sensitive to pesticides. It is best to change the water to improve the ecological conditions of the pool water to prevent the occurrence of fish and shrimp disease. The implementation of mixed fish and shrimp disease, such as must be treated with drugs, the drug should be particularly cautious, strictly grasp the amount of drug physics, to ensure safety. Third, feeding mode. There are pond farming, fish and shrimp mixed culture, net box and paddy fields and other ways. (1) pond specialization. Shrimp seed stocking in summer and fall. Summer from March to April stocking specifications for 1,000 to 3,000 only/kg ...... >>
Question 4: Question. River shrimp how to reproduce, can be raised Some varieties of river shrimp can be fertilized once to produce multiple fertilized eggs, the shrimp to a shrimp breeding shrimp is possible. Water temperature requirements, specific requirements depending on the species of river shrimp, but since it has been holding eggs, do not change the current water temperature is the best choice.
Question 5: how to raise river shrimp? River shrimp is omnivorous shrimp, environmental conditions are not demanding, is widely saline, into the water, freshwater, high and low temperature environment can adapt. Whether large lakes, or ponds, swamps can grow; feeding cycle is short, usually 3-4 months of farming can be caught on the market, and fast turnover of funds; shrimp farming cost is low, high profit high nutrient content, delicious flavor, edible variety, loved by consumers. Adult shrimp aquaculture pond farming, rice paddy farming, net tank farming, large water surface farming.
What should be done in the pond before stocking shrimp fry: river shrimp farming into no special requirements for ponds, as long as you can raise fish can raise shrimp. Area to
2 to 5 acres is good, the water depth of 1 to 2 meters is appropriate, convenient drainage and irrigation, abundant water, non-toxic. Pond substrate to sandy bottom or hard mud bottom is good, the silt should not exceed 20 centimeters. River shrimp culture pond clearing and conventional freshwater pond clearing is basically the same, just need to dig a cross at the bottom of the pool
type of set of shrimp ditch, 70 to 80 cm wide, 30 to 40 cm deep, in order to prepare for the fall river shrimp harvest to let the shrimp set in the ditch, easy to pick up. Lime clearing 100 to 150 kilograms of lime per mu. Pit can be dug in the pond, lime in the pit, to be dissolved, the whole pond evenly splashed
Sprinkle. Stir the bottom of the pond the next morning to prevent the ash from being deposited on the bottom of the water. Thoroughly clear the pond after 3 to 5 days of irrigation, irrigation water should be strictly filtered to prevent hostile organisms with the water flow people, shrimp should be pulled before the empty net.
In the 10 days before the release of seedlings, per mu put cow dung or pig manure 300-500 kg piled up on the foot of the pond beach, every 3 to 5 days to turn the fertilizer, cultivate zooplankton, when the shrimp seedlings in the pond just when the peak of the breeding of zooplankton in the pond, adequate bait can promote the performance of seedlings grow rapidly.
In order to provide river shrimp habitat, hiding places and moulting ecological environment, to prevent fratricide, in the center of this breeding pond planting submerged plants, mainly rotunda black algae, polygrass, eyedropper, usually planted 4 per square meter, planting will be rooted inserted into the pond mud.
Question 6: how to reproduce shrimp offspring There are many types of shrimp, now called Australian freshwater lobster as an example, say its reproduction process:
1, parent shrimp cultivation
Select robust, disease-free, injury-free, specifications for the 20-50 grams, the male and female ratio of 1:1 100 pairs of shrimp as the pro-shrimp, the selection of pro-shrimp rearing in the Covered with fiberglass tiles and heating and cooling system of 6 × 8 × l meters in the cement pool, daily feeding in the pool 10% of the body weight of shrimp freshly cut "lobster" head. The red crayfish has a red, brightly colored anterior exterior, and the length of its chelae exceeds its body length; the female shrimp's chelae are basically blue, and their length is less than the body length. In mature males, the genital protuberance is located at the base of the fifth peduncle and is distinctly rod-shaped; in females, the genital pore opens at the base of the third peduncle. In the rearing of the parent shrimp pool into some washed and sterilized mesh for the parent shrimp hide, daily suction and water change, keep the light 12I: 12D (12 hours of light, 12 hours of darkness).
2, mating and spawning
In late April, the shrimp began to mate and spawn. Red crayfish mating is a soft shell mating, mating before the female shrimp to reproductive molt, in the male division output *** within 12 hours of the female shrimp began to spawn. Eggs produced by females are dark yellow after fertilization and are adherent to the abdominal peduncle as well as to the empty abdomen formed by the inward curling of the tail fan. A weight of 48 grams of holding eggs shrimp carrying a volume of 326 eggs, carrying a high volume of eggs - shrimp holding up to 441 eggs, low only 27.
3, embryonic development
The red crayfish fertilized eggs for the dark yellow, with the development of the embryo gradually changed to yellow-orange, red-orange, light gray. Will hold the egg shrimp is divided into four groups for the embryonic development of comparative tests found that: in 19 ℃ under the conditions of the red crayfish eggs embryonic development is extremely slow; in 21-23 ℃, the incubation of the membrane time of 41 days, 80 days of juvenile shrimp from the mother; 26 ℃ when the fertilized egg 30 days incubation of the membrane, 52 days of juvenile shrimp from the mother; 29-30 ℃, 25 days incubation time of the membrane, 52 days of juvenile shrimp from the mother; 29-30 ℃, 25 days incubation time, 25 days of incubation time, 25 days of incubation time. When, 25 days hatching out of the membrane, 40 days from the mother.
4, larval cultivation
The red crayfish larvae hatching collection put in the pond to feed, the early growth of the larvae are mainly organic debris and chlorella and other single-cell algae for food. Organic debris in the water body, single-cell algae is rich to improve the survival rate of red crayfish larvae is critical, if the number of bait is not enough will happen to kill each other. Through the anatomy of the young shrimp found that the young shrimp gut basically no branchiostoma, copepods and other zooplankton remains, which is mainly due to the poor mobility of the young shrimp on the zooplankton is not easy to obtain. After seven weeks of rearing, the average size of the larvae up to 7.6 cm.
Question 7: how to mate shrimp mating and spawning
In late April, the shrimp began to mate and spawn. Red crayfish mating Chuan soft shell mating, mating before the female shrimp to reproductive molt, in the male shrimp output *** within 12 hours of the female shrimp began to spawn. Eggs produced by females are dark yellow after fertilization, and adhere to the abdominal feet and the caudal fan curled inward to form an empty abdomen. A 48-gram clutched shrimp held 326 eggs, with the high clutches holding 441 eggs and the low clutches holding only 27 eggs.
Question 8: how to reproduce shrimp out of the ordinary river shrimp, how to hatch out, temperature Some varieties of river shrimp can be fertilized once to produce multiple fertilized eggs, of a shrimp to reproduce shrimp is possible. Water temperature requirements, specific requirements depending on the species of river shrimp, but since it has been holding eggs, do not change the current water temperature is the best choice.
Question 9: how to culture river shrimp River shrimp is an omnivorous shrimp, the environmental conditions are not demanding, is a wide range of salinity, into the water, fresh water, high and low temperatures can be adapted to the environment. Whether large lakes, or ponds, marshes can grow; feeding cycle is short, usually 3-4 months of farming can be caught on the market, and fast turnover of funds; shrimp farming cost is low, high profit high nutrient content, delicious flavor, edible variety, loved by consumers. Adult shrimp aquaculture pond farming, rice paddy farming, net tank farming, large water surface farming.
What should be done in the pond before stocking shrimp fry: river shrimp farming into no special requirements for ponds, as long as you can raise fish can raise shrimp. Area to
2 to 5 acres is good, the water depth of 1 to 2 meters is appropriate, convenient drainage and irrigation, abundant water, non-toxic. Pond substrate to sandy bottom or hard mud bottom is good, the silt should not exceed 20 centimeters. River shrimp culture pond clearing and conventional freshwater pond clearing is basically the same, just need to dig a cross at the bottom of the pool
type of set of shrimp ditch, 70 to 80 cm wide, 30 to 40 cm deep, in order to prepare for the fall river shrimp harvest to let the shrimp set in the ditch, easy to pick up. Lime clearing 100 to 150 kilograms of lime per mu. Pit can be dug in the pond, lime in the pit, to be dissolved, the whole pond evenly splashed
Sprinkle. Stir the bottom of the pond the next morning to prevent the ash from being deposited on the bottom of the water. Thoroughly clear the pond after 3 to 5 days of irrigation, irrigation water should be strictly filtered to prevent hostile organisms with the water flow people, shrimp should be pulled before the empty net.
In the 10 days before the release of seedlings, per mu put cow dung or pig manure 300-500 kg piled up on the foot of the pond beach, every 3 to 5 days to turn the fertilizer, cultivate zooplankton, when the shrimp seedlings in the pond just when the peak of the breeding of zooplankton in the pond, adequate bait can promote rapid growth of shrimp seedlings.
In order to provide river shrimp habitat, hiding places and moulting ecological environment, to prevent fratricide, in the center of this aquaculture pond planting submerged plants, mainly rotunda black algae, polygrass, eyes of the vegetable, usually planted per square meter of 4, planting the roots inserted into the pond mud. China's organic agriculture network has river shrimp farming technology.