While she’s occupied, the male sidles across and impregnates her with his sperm. Unlike many other fish, which shoot sperm and eggs into the water, characins fertilise each other internally, just like ...

Swordtail characins (Corynopoma riisei) that live in the rivers of Trinidad feast mostly on hapless bugs that plop into the water from surrounding vegetation. In areas where streams flow mostly ...

image: Talk about a bait-and-switch. Male representatives of the tropical fish known as swordtail characins have flag-like sex ornaments that catch mates just like the bait on a fishing rod would.