Habitat habit

Tail-tailed white shrimp lived in the nearshore and shallow sea, and has strong adaptability to the environment. The suitable range is 2°C-39°C. The salinity ranged from 3°C to 30°C, and it can adapt to the growth in brackish water. However, the tolerance to hypoxia is poor. Below 1 mg/l, it will die due to lack of oxygen.

Diet and growth

The tail-tailed white shrimp has a wide range of dietary habits and can feed on both animal and plant foods. The growth cycle is short, 2 months to 3 months can grow into commercial shrimp. In Sanmen, Zhejiang, you can raise 3 times a year.

Breeding habits

The white-tailed white lobster has a good ability to reproduce, and it holds egg-bearing shrimp almost all the year round. For a mature female, there are 300 to 400 capsules, and more than 2000 to 2500 capsules. The breeding season usually occurs in the spring, summer, and autumn, and it can be propagated about 10 times a year.

Tail-tail white shrimp breeding technique

(a) shrimp pond conditions

The general seawater ponds can be cultured, but it is especially suitable for the middle and bottom of the harbor. The seawater salinity is low, and the ponds rich in natural white shrimp resources in the nearby sea area are the best. Aquaculture ponds should be selected to be free of pollution in the surrounding environment, with less silt in the ponds, with an area of ​​15 mu - 25 mu. It is advisable to separate the pond into the drainage system, and it is better to enter the drainage when the tide is small. There is a ring ditch in the pond, the water depth of the pond beach is 0.5-0.8 meters, and the water depth of the ring ditch is about 1.5 meters.

(b) Seedlings: natural seedlings or artificial seedlings (earth ponds).

1. Natural nursery can take the following methods according to different situations:

(1) After catching prawn in a seawater pond, attention should be paid to keeping the white shrimp in the pond. At the time of catching, the shrimps must firstly exit the gate and finally a large number of white shrimps should be hatched. At this time, they must close the gates in time, and repeatedly put the shrimps. The shrimps can be released and the white shrimps can be kept.

(2) Pay close attention to the situation of white shrimp seedlings in the sea, and adopt the method of draining water through the dense mesh of the vegetable net into the white shrimp seedlings.

2. Artificial seedlings: The most widely adopted method is to use fertilizer and water to breed white shrimp seedlings. The main measures are:

(1) To increase the density of shrimp seedlings in ponds by using fertilizer and water to breed white shrimps. Every time the white shrimp is caught in the pond, leave enough mature shrimp species (1kg - 3kg per mu), especially for the winter season. Leave the parents in the late August of the lunar calendar. At this time, stop the drainage and raise the diet and fertilize the bait. The density of algae in the pond is properly fed with fish and shrimp, egg yolk, and soy milk. The yolks to be fed are wrapped in 120-mesh sieves and crushed into egg yolk suspension. Just like the milk, Quanchiposa, egg yolk and The daily amount of soybean milk is 10ppm-20ppm. White shrimp have enough feed after hatching to increase the survival rate of shrimp seedlings.

(2) If there are not enough eggs in the pond, they can be collected from the sea area and add about 200 mu. Especially in winter and spring, due to the seasons of collecting and harvesting of various products of Tong Pond, the white shrimps are severely deficient, and rely on parental breeding to meet the needs of the ponds.

3. Farming mode:

Sanmen Bay cultured white tailed prawn is mainly polyculture, with mixed crabs (blue crabs) and shellfish (fry or loach) as the mainstream. The output value of white-tailed white prawn accounts for one-third of the whole pond. More than 100 kilograms; followed by polyculture of shrimp, crabs, and shellfish. At this time, the white tailed prawn is a by-product. Due to the differences in harvesting methods between shrimp and white tailed prawn, and the fact that the white prawn is not subject to seasonal restrictions, it can improve the comprehensive benefits of the pond.

4. Feed the bait:

Adhere to feeding every day, shrimp can be used with food, fresh small fish, shrimp, wheat bran No. 4 powder, according to the season, weather, water temperature, tides, water quality and other environmental factors, combined with the actual feeding conditions, reasonably determined. According to the density of shrimp in the pond, the shrimp body water and feeding conditions determine the amount of feeding, which is less in the early period and gradually increases in the middle period. In the later period, as the water temperature decreases, the feeding amount or basically does not vote. Within 3 cm, 8% -10% of the weight of white-tailed shrimp, 3 cm or more in terms of 5% -8% of weight, 0.5 kg - 1 kg of bait per acre, winter water temperature dropped below 5°C, white shrimp Do not eat, at this time began to stop feeding.

5. Clear the enemy:

It mainly removes fish that are predatory to the enemy. It must remove fish in time, use tea cakes in early stages, and combine fishing and catching and cage trapping in the middle and later stages. To clean up.

6. Daily management:

Each morning and evening, the pool is visited once. The patrol pool should pay attention to the observation of shrimp feeding, growth, water color, embankments, inlet and outlet gates, gate nets, etc., and find that problems are solved in time. When encountering adverse weather conditions, it is particularly necessary to observe and take timely measures to ensure the safety of shrimp ponds and the healthy growth of white shrimp. Regularly measure physical and chemical indicators such as water temperature, salinity, and pH, and growth indicators such as body weight and body length of white shrimp, and do a good job in production log records.

7. Timely arrest:

After the white shrimp grows to 5 cm to 6 cm, it can be caught and listed. There are two types of catch: one is to use a shrimp cage for catching, and the other is to collect water to catch, that is, to install a conical sleeve on the drainage gate. The gate opens and the shrimp enters the net with water.

Profile Measuring Instruments

Roughness profiler all-in-one machine is an all-in-one machine for measuring profile shape and surface roughness, which has the powerful function of analyzing and measuring profile shape and surface roughness. Realize accurate measurement of dimensions, shape and roughness. It is mainly used to measure the parameters of the surface micro-geometry and macro-geometry of mechanical parts such as straightness, inclination, angle treatment, roundness treatment, double-groove treatment, double-arc treatment, etc.

Performance characteristics
1. High accuracy, high stability and high repeatability: meet the measurement accuracy requirements of the measured part.
1) Select high-precision grating measurement system and high-precision inductance measurement system, with high measurement accuracy;
2) Independently researched and developed high-precision grinding guide rail system, which has good wear resistance of guide rail materials and ensures stable and reliable operation of the system;
3) High-performance linear motor drive system ensures high measurement stability and good repeatability.
2. Intelligent management and detection software system:
The operation interface of the instrument is friendly, the operator can easily master the operation of the instrument, and the use is very simple.
1) The company has accumulated many years of practical measurement software design experience to provide customers with simple, practical and fast operation experience;
2) The company has invested many years of human resources in the development of instrument software, with special software copyright;
3) With powerful functions, it can automatically process data, print reports in various formats, and automatically display, print, save and query measurement records;
The data can be archived or printed in a centralized manner, which does not take up the verification operation time;
4) The measurement range is wide, which can meet almost all types of workpiece profile measurement, including special measurement functions of special workpiece screw, bearing, thread and other profiles;
5) The measured section can be selected automatically and manually for evaluation, and software functions can be customized according to customer requirements;
6) Powerful CNC automatic measurement and automatic labeling analysis function;
For large quantities of the same type of workpiece, it can carry out CNC measurement, automatically analyze and process the data, and carry out SPC statistics on the data, and can carry out statistical analysis in various ways to give quality control guidance;
7) It can automatically record and save all verification results by using computer large-capacity database storage.
3. It can also measure surface roughness and contour shape
With the same main body, you can only switch different modules to measure the profile shape and microroughness of the product.
4. Multi-parameter evaluation
The roughness can be automatically evaluated according to different standards, including Ra, Rp, Rv, Rz, Rt, Rmax, Rq, Rsk, Rku, RSm, RPc, Rdq, Rdc, Rmr and P parameters, W parameters, Motif parameters, Rcore parameters and other multi-parameter evaluation.
5. Thickness parameter measurement
When measuring the roughness parameters, the height and thickness of some film steps within 600 microns can be measured simultaneously. The measurement is convenient, and the accuracy is controlled within 2% H (H, the total height of measurement). It is especially suitable for high-precision measurement occasions without scratches.
6. Measuring force system:
With the voice coil motor force measuring system, the force measurement can be continuously adjustable from 10 to 150 mN, and the force measurement resolution can reach 0.2 mN; It avoids the force measurement error caused by the vibration of the surrounding environment when the old weight is loaded, and reduces the measurement error caused by the change of the force measurement.
7. Intelligent protection system:
The instrument is protected by hardware and software in all directions, which can effectively protect the instrument host and probe, and reduce the probe and instrument damage caused by personnel's operation errors.
8. Flexible manual control:
The instrument is equipped with a special separating operating rod, which can be placed at any position to control the operation when the instrument is operated and moved, and the measuring needle can be roughly positioned before measuring the workpiece; In the case of leaving the computer, the operating rod has the functions of moving the measuring needle left and right/up and down, emergency stop, the angle swing of the measuring rod up and down, and multi-level speed adjustment.

Profile Measuring Instruments,Profilometer Accuracy,Profile Measuring Machine,Surface Profile Measurement

Zhejiang dexun instrument technology co., ltd , https://www.dexunmeasuring.com