This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
鯥 combines 魚 (fish) with 坴, which likely contributes the sound. The exact historical development is uncertain.
The left side is a fish 魚, and the right side 坴 suggests a sound. Since the meaning is unclear, picture a rare fish with a name that sounds like リク.
For リク, imagine a rare fish that licks its lips: lick -> リク, and the fish 魚 is the one doing the licking.