Breeding of lobster seedlings in autumn will be a good harvest in the coming year
The spring and autumn season is a good season for the artificial breeding of lobster. From September to October, you can choose broodstock, and you can also choose broodstock in the next March or March. The broodstock requires a weight of 30-50 grams, complete appendages, health and disease-free, strong activity, male to female ratio of 2-3:1. Male and female lobsters have obvious features in appearance and are easy to distinguish.
Physical characteristics of mature lobster, male individuals significantly larger than females. Male lobsters have large feet, and there are bright red mollusks on both sides of the lobster legs. Female lobsters have relatively small feet, and most of the females have no red soft palate. Even the colors are pale. The male gonopore opening is at the base of the fifth pair of stepped feet, and the female gonopore is open at the base of the third pair of stepping feet. Sexually mature females have enlarged abdomens and the male stomach is relatively narrow.
The broodstock breeding broodstock pool area should be about 1200 cubic meters, the bottom soil should be loam soil, the water depth should be about 1 meter, and the pond width should be more than 1.5 meters. There should be sufficient and good water sources, and the injection and drainage ports should be well established. Use plastic film or calcium plastic plates to prevent escape, and use 50-60 kilograms of quicklime to disinfect ponds per acre for 7-10 days before stocking. After disinfection, the water is filtered to a depth of about 1 meter (to prevent wild fish from entering the pond), and 500-800 kg of decomposed livestock manure is applied per acre of water. Into the pond, concealed objects such as branches, roots, bamboo tubes, etc., are provided for shrimp climbing and some plants are transplanted.
The broodstock pool can be used to put broodstock 40-60 kilograms per acre of water. Before stocking, it should be bathed with 3% saline for 10 minutes to kill pathogens. In order to make full use of the water body and regulate water quality, 50-100 tails of cockroaches and squid can be mixed in each mu of water. During the cultivation period, fresh water grass, bean cake, wheat bran or compound feed can be fed and a part of animal feed can be added. Such as chopped snail meat, livestock slaughtered leftovers and so on. Daily feeding amount: In March, it is 2%-3% of broiler weight, 4%-5% in April, 6%-8% after May, and 1 feeding each morning and evening, mainly in the evening. It accounts for 70% of the amount of bait. At the same time strengthen the management of water quality, change the new water once every 10-15 days, change the water for 1/3 each time; every 10 days, every cubic meter of water surface will be splashed with quick lime 10-25g water once to maintain good water quality, promote pro Shrimp gonadal development.
The broodstock breeds from April to May. When the water temperature is above 20°C, broodstock begin to mate. Fertilized eggs hatch into juvenile shrimp in the female's abdomen, and incubation takes 40-70 days. After juvenile hatching, the growth and development of juveniles are completed under maternal protection. When young shrimp leave the mother, they can take food and live independently. When a large number of juvenile shrimps are found in the breeding ponds, the seedlings should be harvested in time for the cultivation of shrimps.
The lowest survival temperature of the broodstock lobster was 5°C. However, when the water temperature is lower than 9°C, the mortality rate is high during the overwintering period for shrimps of about 3 cm in size, and although adult shrimps can survive, there are also many deaths after 2-3 months. Therefore, do a good job wintering work of broodstock, ensure that the water temperature during the winter is in the 16 °C -18 °C, but also an important part of the entire breeding work.
The method of overwintering of broodstock is the same as that of Macrobrachium rosenbergii. Commonly used wintering methods include plastic film-covered pool insulation method, electric heater heating method, hot spring water overwinter method, factory residual hot water overwinter method and glass room overwinter method, etc. The safe wintering effect of broodstock.
Although the lobster of the nursery technology is small, the fertilization rate can be over 98%, and the hatching rate can reach 80%-85%. The problem is that post-emergence growth of clams is frequent and susceptible to environmental conditions that affect seedlings. To improve the seedling raising rate, the following points must be made:
Water quality requirements. During lobster breeding, it is necessary to keep the water body relatively stable, the water quality is fresh, the pH value is between 6.5-8, and the water temperature difference between day and night is prevented; the dissolved oxygen in the water should be kept above 5.6 mg/L.
Water environment. The surface of the water must have a water lotus (1/3), the bottom of the water is best to have plants, and there are hidden caves to increase the attachment of shrimp seedling clam shell, but also easy to grasp the seedling time and shrimp growing situation. The water inlet is equipped with a fence and a filter to prevent the entry of predators into the pond, while preventing frogs from entering the pool and spawning eggs to avoid sturgeon. At the same time, it is necessary to prevent the brooding shrimps from climbing.
40m Laser Distance Meter is a functional and advanced measuring tools, no need climbing up and down, which is the engineers' best friends. No matter you have your own brand or not, JRT can help you to start with laser range finder business. JRT sold more than 1 million OEM laser distance meter modules last year, and we will triple or fifth times of that quantity.
We accept OEM/ODM and customized product.
>1. Logo printed customized: at the back of the instruments etc.
>2. Distance customized: 40m, 60m, 100m, 150m.
>3. Package box customized
Distance Measure Meter,40M Laser Distance Measure,Laser Distance Meter 40M,40M Laser Distance Meter
Chengdu JRT Meter Technology Co., Ltd , https://www.infrareddistancesensor.com