Mnemonic

You cast a hook into a flooded field, but the water is boiling — Flames beneath are heating it like a giant soup pot! A Fish leaps out of the scalding field, and your hook snags it midair. One perfectly cooked fish straight off the flames!
Additional thoughts
Picture a rice paddy turned into a boiling cauldron: flames roar underneath, the field bubbles, and a desperate fish launches skyward right onto your dangling hook. The layered image mirrors the kanji's stacked structure — hook on top, field in the middle, flames at the bottom.
Quick recall
A hook over a boiling field heated by flames snags a leaping fish.

Details

The keyword for 魚 is fish. This kanji represents fish in a general sense, referring to any aquatic creature that swims in water, has scales, fins, and gills. It is one of the most commonly used kanji in Japanese, appearing frequently in contexts related to seafood, marine life, and fishing. It also serves as a classifier for many specific types of fish when combined with other characters.
On'yomi
ぎょ
Kun'yomi
うお、さかな、-ざかな