Moray Eel
Search the Shallows at night; despite its appearance, the game treats it as a normal-size net-compatible fish.
Best capture method
Net Gun. Catch stars measure quality, not rarity. Bring the target back alive whenever its rules allow it, and reserve Recovery Drone charges for large compatible fish.
Restaurant use
Moray Eel Curry. Enhance this dish only when its ingredient route is repeatable; a stable Fish Farm supply beats a one-night spike.