This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
鱝 combines 魚 (fish) with 賁, which likely contributes the sound. The exact historical development is uncertain.
The left side is 魚 (fish), and the right side is 賁. Without a clear meaning, picture a rare, mysterious fish with a name that sounds like the right component.
For フン, imagine a fun, rare fish: fun -> フン, and the fish 魚 is the fun part of this kanji.