Anglerfish
David, Peter. “National Geopraghic.” National Geopraghic, www.nationalgeographic.com/magazine/2016/12/basic-instincts-ceratioid-anglerfish/#/anglerfish-3x2.jpg.
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The image you see to the left is that of a female anglerfish. The things attached to her side? Those are the males anglerfish, which live on the sides of their mates. As you can see, a female can keep multiple males at one time. "His mouth fuses with her skin, and the bloodstreams of the two fishes become connected."(Britannica). The male anglerfish becomes a sperm-producing parasite, fertilizing her eggs as she produces them.
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Clownfish
https://www.aquarium.co.za/species/entry/western_clownfish
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According to Encyclopedia Britannica, "all clownfish are born with immature male and female reproductive organs", meaning they can change their sex according to the needs of their group. Clownfish live in schools. The largest fish is the leader of the group and only one with mature female reproductive organs. The second-largest is the only one with mature male reproductive organs, and the only fish allowed to mate with the female. When the female dies, the male becomes the largest and changes to a female. The third-largest becomes the second-largest, and develops its male reproductive organs.
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Citations
1.)Edmonds, Patricia. “Anglerfish, Taking Romantic Attachment to a Whole New Level.” National Geographic, 15 Nov. 2016, www.nationalgeographic.com/magazine/2016/12/basic-instincts-ceratioid-anglerfish/.
2.) Rafferty, John P. “Common clown fish.” Encyclopædia Britannica, Encyclopædia Britannica, inc., 17 Oct. 2017, www.britannica.com/animal/common-clown-fish#toc308089.
3.) The Editors of Encyclopædia Britannica. “Anglerfish.” Encyclopædia Britannica, Encyclopædia Britannica, inc., 12 Apr. 2017, www.britannica.com/animal/anglerfish.
2.) Rafferty, John P. “Common clown fish.” Encyclopædia Britannica, Encyclopædia Britannica, inc., 17 Oct. 2017, www.britannica.com/animal/common-clown-fish#toc308089.
3.) The Editors of Encyclopædia Britannica. “Anglerfish.” Encyclopædia Britannica, Encyclopædia Britannica, inc., 12 Apr. 2017, www.britannica.com/animal/anglerfish.