How to Do It
- Get Electric Eel.
- Locate the boss.
- Bite them, and every time their mouth is near, stun them. This is quite easy if they're near the waterfall, and can get stuck on a branch. You can do this at level 1, too, which is what I did.
- Win!
Source: https://gameplay.tips/guides/4028-feed-and-grow-fish.html
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