Is the crab active or alive? Generally speaking, as long as the antennae and eyes are active, they are basically alive.
Live crabs contract when they touch their eyes, while dead crabs usually stick their eyes out. If the live crab is energetic, it will spit out small white bubbles, while the crab with poor spirit may not have this feature. So observe the difference between death and life.
If there is no response when touching your eyes, you can untie the rope tied to the crab and put it on the table to see if it can crawl or extend its claws. Without this feature, it means that it is dead and must be discarded.
Does the crab have only a little kinetic energy to eat? Crabs can usually turn their eyes to eat.
The eyes of living hairy crabs will move automatically when they are touched, while the eyes of dead crabs will not.
Crabs mainly feed on dead fish, dead shrimp and other animal carcasses in the water, so there will be a lot of bacteria in crabs. Live crabs can excrete bacteria from their bodies through their own metabolism, but bacteria in dead crabs will accumulate in crabs and produce toxins. Eating dead crabs will lead to poisoning.
Does the crab look alive or dead? 1. Smell it
The most direct way to judge whether a crab is alive or dead is to smell it. Sea crabs and river crabs generally smell fishy, which is inevitable. But the dead crab has begun to rot, so it smells a little smelly. This smell cannot be concealed, so it is easy to smell.
2. Look at your eyes
A dying crab may not have much strength, or it can't move because its body is tied, but its eyes can move. Observe its eye stalk or touch it directly. Live crabs can move on their own, but dead crabs can't move their eyes. This judgment method is more accurate.
Step 3 pour some water
Crabs breathe through gills, which may not be obvious in the air, but they are easy to see as long as there is water. Pour some water into its mouth. If it is still alive, it will open automatically. If it is a dead crab, it will not respond. In addition, live crabs spit out bubbles when they breathe.
Step 4 untie the rope
Generally, crabs are tied with ropes. In this case, its activities are limited. In addition, low-temperature storage can make them fall asleep. Therefore, it is hard to say whether to die or not. You can put it at room temperature, untie the rope and wait for a while to see if it can climb. The living usually move.