The first reason why green gills appear on crabs is that there is a lot of green algae in the water where the crabs grow. The respiratory function of the gills of some crabs is not good, allowing green algae to adhere to the gills.

Another reason may be that the crab's growth environment is harsh, the genes have changed, and the chromosomes in the body have changed. If the hairy crabs you buy have green gills, it is best not to eat them.

Extended information:

Avoid eating the four organs of crabs. These four organs are the crab stomach (a small triangular-like bony package in the center of the front edge of the crab shell), the crab intestine (a black line from the stomach to the navel), the crab heart (commonly known as the hexagonal plate), and the crab gills (the eyebrows on the abdomen). Two rows of soft things in the shape of two). Among these four kinds of organs, bacteria and harmful substances are the most numerous, so they must be removed when eating.

Hairy crabs are rich in protein, several times higher than ordinary fish, and are also rich in trace elements. Hairy crabs are salty in taste and cold in nature, and have the functions of clearing away heat, nourishing yin, activating blood circulation and removing blood stasis. The amount of hairy crabs eaten at a time should be kept within 2. Crabs have high cholesterol and protein, and excessive amounts will increase the burden on digestion.

People's Daily Online - Yangcheng Lake hairy crabs are on sale? Transform from a foodie to a crab-eating expert in just a few steps

China Economic Net - Green gills appear on hairy crabs. Expert advice: Don't eat them or they may have genetic mutations.