1, shrimp head blackened or belong to a relatively normal phenomenon, not because the shrimp is bad.

2, at the same time, if the meat of the body of the shrimp also began to turn black, it must be thrown away, because it is likely to be because of the performance of the shrimp's meat is bad, do not eat it, it is likely to cause harm to the human body.

Shrimp hair black shrimp must not be fresh

1, if stored at room temperature, over time, the shrimp head will become black, which to a certain extent can reflect the freshness of shrimp. However, the blackening of shrimp is mainly the role of enzymes, and microorganisms have little to do.

2, even under frozen or refrigerated conditions, tyrosinase is still active, so blackening will still occur.

3, the shrimp head is also where the internal organs of the shrimp, if the shrimp eat a lot of dark-colored algae, such as brown algae right before fishing, may also appear shrimp hair black.

4, in addition, breeding shrimp undigested feed may also appear black.

Shrimp head black has a variety of reasons, some are normal phenomena, but also because of the quality of the shrimp itself, so, according to the shrimp head black this phenomenon to determine whether the shrimp is fresh must be cautious. Of course, if you are still very uneasy, then choose to buy a little more expensive live shrimp, live shrimp taste better, but also more reassuring