What is the connection?

- The bitterling fish
- Unio bivalve
- A pregnant woman

Unio sucks in the bitterling fish eggs via siphons. The eggs mature whilst similarly the Unio itself breeds. Unio releases the larvea, which symbiotically sticks to the fish. The bitterling fish can then be used as a pregnancy test. If a woman is pregnant, the ovipositors of the bitterling fish protude.

Learn something new every day!

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