Caressing activity in internally fertilized fish

Among internally fertilized cartilaginous fishes, mating behavior is diverse. When cat sharks mate, the male's body curls up around the middle of the female's body, and he usually uses one flipper to fertilize her. Tiger sharks engage in vigorous caressing activities before mating, and then the male presses the ventral surface of the female, swings its tail rhythmically, and uses its right flipper to fertilize. The mating takes about half an hour.

When ray fishes mate, they stick close to the ventral surface, twist the tails together, and roll up the pectoral fins toward the ventral surface. The male fish uses the spines of the pectoral fins to hug the female fish, and uses both fins and feet together when ejaculating. When stingrays are mating, the male and female swim slowly in the water. The male covers one-third of the female's back. When the body is turned, you can see the male's pelvic fins bending forward, covering the female's abdomen and excreting. Fine activities.

Hao Min's killifish also undergoes internal fertilization. During mating, the male fish arranges sperm spores near the female's reproductive pore. Before fertilization, the end of the sperm spores ruptures and the sperm enters the female fish's body.

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