Discover the secrets to snagging the rare Thornfish in Roblox’s Fisch game. Equip yourself for a successful hunt with our expert tips.

Catching the Thornfish in Fisch is about precision. This secret rarity is one of the trickiest catches in the entire game, locked behind specific weather, time, and seasonal conditions. It only appears in the Second Sea at Pine Shoals when it’s foggy, nighttime, and autumn.
Even if all those stars align, hooking it is no small feat. It cuts your reeling progress speed by 80% and moves unpredictably along the bar. Add to that its requirement for luminous larvae bait, and the Thornfish quickly proves it’s not meant for casual fishing. This guide breaks down everything you need to know to prepare, bait, and finally catch this elusive creature
Catch Thornfish in Fisch Roblox
The Thornfish is a secret rarity fish located only in the Second Sea, specifically at Pine Shoals. This is the only area where it can be caught, so there’s no point casting your line elsewhere. To maximize your chances, you need to meet three exact conditions: it must be night, the weather must be foggy, and the in-game season should be autumn. These aren’t just optional details. Without all three in place, the Thornfish simply won’t appear.
Once the conditions are right, the next step is bait. The Thornfish is only attracted to luminous larvae. Using anything else is a waste of time. Stock up before your fishing session, as the opportunity window can be short, especially if the weather shifts.

After you hook it, the real challenge begins. The Thornfish is highly erratic and reduces your reeling progress speed by 80 percent. It moves unpredictably across the bar, making it significantly harder to catch than standard or even rare fish. If your equipment is outdated or your reflexes are slow, the fish will break free quickly.
When caught, the Thornfish grants 8000 XP and registers as a unique entry in your bestiary. It doesn’t have a known weight or value in C$/Kg, but its main appeal lies in its rarity and the experience reward.
Preparation is essential. Make sure your gear is upgraded, your bait is stocked, and your timing is sharp. Missing the conditions means waiting for the next weather and seasonal cycle, which can take time. Catching the Thornfish is less about chance and more about patience, precision, and planning.
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