Second, little seafood's temporary support methods:
1. Use circulating water for a long time to exchange cool and clean seawater to water dishes with less seafood;
2, the water temperature is controlled within 65438 08 degrees Celsius; The water depth does not exceed 2 cm;
It's best to find some clean sand and bury little seafood in it for a long time.
Be careful not to use strong light or be exposed to the sun.
3. Calibration of seawater salinity. Salt content of seawater is an important characteristic of seawater, which, together with temperature and pressure, is a basic parameter for studying the physical and chemical processes of seawater. Many phenomena and processes in the ocean are often related to the distribution and change of salinity, so the research on the distribution and change of salinity in the ocean plays an important role in marine science.
4. The surface seawater of the world's oceans is affected by evaporation, precipitation, icing, melting ice and land runoff, and the salinity distribution is uneven: the salinity near the poles, equatorial regions and sea areas affected by land runoff is relatively small; In the sea area of 20 degrees north and south latitude, the salinity of seawater is relatively high. The salinity of deep seawater has little change, which is mainly controlled by physical processes such as circulation and turbulent mixing.
5. According to the characteristics of salinity distribution in the ocean, water masses can be identified and their movement can be understood. The influence of salinity should be considered when studying the interaction and equilibrium relationship between ions in seawater, exploring the migration law of elements in seawater and determining some components dissolved in seawater. In addition, because it is often difficult to measure the density of seawater directly and accurately in the field, countries usually measure salinity, temperature and pressure, and then calculate the density according to the equation of state of seawater.
Extended data?
First of all, the shape of shrimp reptiles
1, Shrimp Creeper It looks very strange, with a flat body, about 15 cm long and 2 ~ 4 cm wide. Its chest has a pair of big knife legs like mantis, and the hard shell on its back is evenly divided into 10 knots, which is under and around the whole shrimp body.
2. They are all soft and hard, with long and short manes and strange legs. They are very dense. When swimming, those bristles keep flapping, and the tail is like a small dustpan.
Second, the choice of shrimp and crayfish.
1, the best month to eat shrimp and crayfish is April-June every year, when the meat is the most full. Generally speaking, female crayfish are not as big as male crayfish, and another way to distinguish between males and females is that, under normal circumstances, female crayfish have a white "king" around their necks, while male crayfish have a thin claw under their big claws.
2. Like picking fish, if the color of shrimp is bright blue, it is fresh shrimp. If the color is dark but not bright, it is stale shrimp. In addition, you can also look at the shrimp head. If the shrimp has soft hair and seems to fall off, it is not fresh shrimp.
3. It can also be seen from the claws of the shrimp that the red claws are not fresh, and the blue ones are good shrimps.
Although the dead crayfish can still be eaten, it is best not to buy it if the Pippi shrimp has softened and turned red at the time of purchase.
Baidu Encyclopedia-Shrimp Crawl