- Attack - One Foe, Normal Attack
- Sticky Slime - One Foe, Pleasure Attribute, Slime 75%
- Electric Discharge - One Foe, Magical, Lightning Attribute, Shock 10%
- Earthquake - All Foes, Auto-Hit, Earth Attribute
Use Lightning and Earth attacks and you will be fine.
"When I was younger, I used to catch catfish in the nearby pond... ...Of course, I'm lying. The Catfish Girl uses nasty attribute attacks. Thunder, earth, both are troublesome. In particular, Earthquake hurts your whole party. It will be painful if some of your allies are weak to earth. Since she's a sea creature, lightning is effective. Even though she herself can use lightning, it's still effective. Abnormal status effects are also effective. If her magic is painful, then stop her from using it altogether. Now go, oh brave Luka. Bring that catfish out of the water... Though I've heard some have lungs..."