How anglerfish find mates and why:When it is mature, the male's digestive system degenerates, making him incapable of feeding independently, which necessitates his quickly finding a female anglerfish or else dying. In lieu of continually seeking the vast abyss for a female, it has evolved into a permanent parasitic mate.
When he finds a female, he bites into her skin, and releases an enzyme that digests the skin of his mouth and her body, fusing the pair down to the blood-vessel level. The male then atrophies into nothing more than a pair of gonads, which release sperm in response to hormones in the female's bloodstream indicating egg release. This extreme sexual dimorphism ensures that, when the female is ready to spawn, she has a mate immediately available.
It's kinda unbelievable, the hideosity, also the remarkable adaptation, but the hideosity too.
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