image courtesy - The Online Zoo
One species of South American catfish has an unusual mating technique whereby the female drinks the male's sperm. When fish release their eggs and sperm into the water for external fertilization, they face a common problem: turbulent water washes many away. By attaching her mouth to the male's genital area, the female cattish ensures that fewer sperm are wasted. While attached, the female will simultaneously release her eggs into a pouch she forms with her ventral fins.
The female's gill-covers remain tightly shut as though she is drinking. She Swallows the sperm, with a little water, and passes it quickly through her intestine and out with the eggs.
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