HIGHLIGHTS
- Rocket Fuel is a secret fish in Fisch found in Mushgrove Swamp, and it is easy to catch due to its low Resilience and slower progress speed.
- Players do not need specific conditions, but using Etheral Prism Rod, Weird Algae, daytime, and winter boosts your chances.
- You can expect the Rocket Fuel you catch to weigh about 1.25 kg and sell for an average of 769.2 C$.
Fisch version 1.21, also known as the Egg update, was released on March 8, 2025. It introduces Eggs, Glimmersuit Boots, and a new Bait Shop.
The four eggs added in this update are Megalodon, Kraken, Orca, and Whale eggs, which can be obtained from events.
This version also adds two new boats and three secret fish: Boots, RocketFuel, and Speed Core.
Rocket Fuel In Fisch
Rocket Fuel is a secret fish in Fisch that can be found in Mushgrove Swamp. It is not too hard to catch because it has low Resilience and negative 20% progress speed.

However, the chance of catching it is quite low, so you will need the right setup and a bit of patience.
Catching Rocket Fuel In Fisch
You do not have to worry about specific weather, time, or bait preferences to catch the Rocket Fuel.
Although this fish does not have any preferences, you can use the following alternate conditions to maximize your chances;
- Fishing Rod – Etheral Prism Rod, Heaven’s Rod
- Bait – Weird Algae
- Time – Day
- Weather – Clear, Rain
- Season – Winter
Players have about a 0.2% chance of catching Rocket Fuel, which is not high, but it is the most effective way.

The rods and bait mentioned above strike a good balance, giving you a solid chance to catch this fish without making the process too hard.
While there may be setups that give a slightly higher catch rate, they often use hard-to-obtain rods.
However, if you have access to these rods, you can use them to increase your chances.
Finally, the caught Rocket Fuel usually weighs around 1.25 kg and can be sold for 769.2 C$.