This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
魭 combines 魚 (fish) with 元, which likely contributes the sound. The exact historical development is uncertain.
The left side is a fish 魚, and the right side is 元. Since the meaning is unclear, picture a mysterious fish with the character 元 on its side, waiting to be identified.
For ゲン, imagine a genie (ゲン) emerging from a fish-shaped lamp: genie -> ゲン, and the fish 魚 is the lamp.