This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 鮔 is uncertain. It visually combines 魚 (fish) with 巨, but the original semantic and phonetic roles are unclear.
A fish 魚 beside a giant 巨 shape: perhaps a giant fish, but its true meaning is unknown.
For キョ, imagine a giant fish letting out a surprised 'kyo!' sound: kyo -> キョ.