There are male and female fish glue, respectively, from the male and female swim bladder, Hong Kong people prefer to eat male glue, coveted for the thin body of the soft and slippery, not easy to melt in the mouth, on the contrary, the domestic people are fond of eating the female glue, that the thicker body of the more viscous, in a word, each has its own good. In short, each is better than the other. From the shape, the male is longer and thinner, and the female is more round and thicker; from the taste, the same kind of rubber male is more refreshing, and the female is more gelatinous, so it is more viscous; from the stewing time, the male is more resistant to stewing than the female; from the efficacy, the male is better than the female, and the price is more expensive than the male than the female.