Atlantic Wolffish: Creepy-Looking But Amazingly Affectionate

Wolffish pair up and fertilize the female’s eggs internally
Also, while most fish species “broadcast spawn” (with females releasing thousands of eggs into the water, and males competing to fertilize them externally), wolffish pair up and fertilize the female’s eggs internally, which means they mate much in the same way mammals mate. In addition to that, depending on the water temperature, the female incubates the eggs for four to nine months and then lays them in large clusters. After that, the male aggressively protects the eggs for about four months until they hatch.