Nutritional reasons. The original ecological red mouth ao fish glue resources are basically depleted, nutrition can not be supplemented, so it affects the appearance, not good-looking. Red mouth ao fish glue fishermen self-tanning appearance is not good-looking nutritional reasons. Red-mouthed slate is a kind of deep-sea fish, living in the deep-water ocean from not polluted, mainly distributed in the western North Pacific Ocean, Guangdong Nan'ao Island around the sea, belongs to the precious fish species.