Evanna Lynch received the salmon as her Patronus when she took the quiz on Pottermore for the second time.

What does it mean if your Patronus is a salmon?

By receiving the salmon as your Patronus, your witch or wizard subconscious is telling you to trust your instincts, and keep going. ... This fish has a natural strength that can travel up waterfalls without needing limbs, and so you need to stay determined in times of strife and sorrow.

What is the rarest Patronus list?

The albatross is the rarest Patronus on our list; the one belonging to the lowest number of Wizarding World fans. With the longest wingspan of any bird – up to 11 feet – the albatross surfs the ocean winds for hours, hardly even needing to flap.