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Mallard ducks spread carp around the world

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Digging a reservoir

Whether it’s raining or not

When water is filled

There are cases where fish appear ‘spontaneously’.

Where did this fish come from?

There is no waterway.

One of the reasons is

birds eat fish eggs

Come to the reservoir and defecate

There are surviving eggs

Hatching…

Of course, this only applies to fish eggs of strong survival types…

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Spawning carp (left) and black horse. Mallard ducks enjoy skimming and eating carp eggs on black horses.

https://www.hani.co.kr/arti/animalpeople/ecology_evolution/950582.html

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