Of the 160 deep-sea anglerfish species, only about 25 have the behavior of male fish parasitic on females, namely sexual parasitism. Among these species, males are small in size, without the huge squats and iconic fishing rods of females, which look like another completely different species.
The anglerfish is slow and not gregarious. It is hard to find a woman in a vast ocean. Therefore, once the male fish encounters the female fish, it immediately bites the female fish with its mouth, and it is not loose for a lifetime. From then on, the bite of the female and male fish will be connected by blood, and the nutrition of the male fish will be continuously supplied by the female, while the male is degraded and only the genitals are left. Sometimes, even a male fish will have several male fish adsorbed. Female fish generally grow to more than half a meter, some up to one meter, and the male anglerfish does not exceed twenty centimeters.