This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
鱎 combines 魚 (fish) with 喬, which likely contributes the sound キョウ. The exact historical development is uncertain.
The left side is 魚 (fish), and the right side is 喬 (a tall structure). Imagine a tall, elegant fish, but its exact meaning remains a mystery.
For キョウ, picture a fish leaping high like a 京 (きょう) tower: 京 -> キョウ, and the fish jumps tall.