"Look": A look at whether the pro-crab is an authentic Yangtze River water mitten crab, the size of the pro-crab should not be less than 2 to 2.5, to 2.5
Two or more is appropriate. Second, see if the crabs are neat and lively and have no disease. Three to see whether the body color of crab seed is old.
"Catch": Use the net to remove the crabs, grab them by hand, dry the water and dry them. The good crabs do not clump and will immediately spread out from the palm of your hand. Feelings of crawling crabs are powerful, and the response to mouth blowing is sensitive. The juvenile macroscopic larvae identified by this method generally have a period of more than 4 days. They have a strong physique, few impurities, and high survival rates and aquaculture survival rates.
"Measurement": The size of crabs should be about 140,000 per kilogram, and not more than 180,000. 5 when measuring
About gram of crabs draw water and then weigh on the balance. Crabs that meet the specifications generally have fewer fake seeds and become young crabs.
"Amount": A quantity of salinity. Crabs are seawater seedlings and freshwater aquaculture. The salinity of water bodies at the time of emergence is not higher than 5%. If the use of specific gravity measurement should be within 1.004. If there is no available taste of the instrument, it is advisable to have substantially no salty taste. Two water temperatures. The temperature difference between the nursery pond water temperature and the aquaculture pond water temperature should be within 2°C, and no more than 5°C. Generally, the seedling emergence temperature is about 21°C.
"Test": For inexperienced farmers, it is best to carry a bottle of water from the culture pond on the day, and put 10 crabs in the bottle (the bottle should be open to violence), if not within 6 hours. Death occurs, generally indicating that the seedlings are robust and the varieties are relatively pure.
Basically adapted to aquaculture water bodies.
National free consultation call to 420874
This 50m distance measuring meter is made of two parts: the laser distance outside unit and the sole part laser measure module. Great distance range is from 3cm to 50 meters with ±1.5mm high accuracy. Digital distance measuring device is quick and reliable measure with one hand pushing the button. It is designed for hand helding, very convenient to put in your jacket pocket or trouser pocket.
1>. Easy to Use. It is very easy to learn how to use a Laser Distance Meter, it can measure distance with pressing a single button.
2>. Safety. Using a laser distance meter to measure is much safer than using a measure tape, for users do not need to climb up and down.
50M Laser Distance Measurer,Mini Laser Measurer, Laser Measure 50M,50M Laser Distance Meter
Chengdu JRT Meter Technology Co., Ltd , https://www.cdlaserdistancemodule.com