This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
魡 combines 魚 (fish) with 勺, which may have contributed a sound. The exact historical development is uncertain, and the character is rare.
The left side is a fish 魚, and the right side is 勺, which looks like a ladle or a hook. Picture a fish being caught with a ladle-shaped tool, but the meaning is uncertain.
For テキ, imagine a fish being hooked by a technique: technique -> テキ, and the fish is caught by the 勺-shaped hook.