Cultivation of White-tailed Shrimp in Autumn and Winter

Cultivation of White-tailed Shrimp in Autumn and Winter

Pond conditions Ponds belong to the high level pool and require water to be pumped into the pool for a total of two acres. Each has an area of ​​4 mu. There is a sluice gate and the bottom of the pond is flat. The pond is inclined to the outlet with an average water depth of 1.5 meters and a salinity of 6.2 水. Shrimp ponds are ready for dry ponds on September 4th and are sterilized with 5 kg bleaching powder per acre. September 8 water injection 0.6 meters deep, with 0.2 grams of dibromohydantoin water per cubic meter of water disinfection, the next day, 2.5 kg of urea per acre, phosphate 0.5 kg of fertilizer water quality. Holding Eggs on Shrimp Restocking On September 18, 13 kilograms of broodstock were placed in two ponds on average. Water quality management During the incubation and cultivation of shrimps, the water color should be light yellowish green or light yellowish brown. Transparency is controlled at about 30 cm. Fertilizer concentration is controlled by putting 1 gram of nitrogen fertilizer and 0.1 gram of phosphate fertilizer per cubic meter of water body. After dissolution, it is splashed with water. Afterwards, fertilizer is applied at any time depending on the color of the water. When the body length of the shrimp reaches 1.5 cm, it is gradually added to the water to gradually deepen the water level. During the growing period of the ridge tailed white shrimp, each time it encounters tidal water, it enters and drains once. When draining, the bottom gate is pumped out to allow the sewage to flow out from the bottom. Each time it is discharged 30 to 40 centimeters, and then it is injected with fresh water to promote shelling of the ridge tailed white shrimp. After feeding the shrimps with an average body length of 1.5 cm, artificial feeding must be performed. The materials of No. 0 and No. 1 of Penaeus vannamei can be used. The whole pond is sprinkled in the early stage. Afterwards, the whole pond is evenly fed on the surface of the pond every day. Every morning and afternoon, once the water temperature is lowered, the feed amount should be reduced or Basically do not vote, generally in the water temperature above 5 °C, when the weather is fine, feed once at noon.

Roughness Profilometer

Roughness Profile Measuring Instruments 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