Build a Fish Farm That Can Keep Running

A tank full of fish needs more than a place on your counter. This Probably Stolen fish farming guide follows the aquaculture system added to the playable demo on October 19, 2026: acquire equipment from the Retired Aquafarmer, maintain the tank environment, then grow and harvest fish. Keeping that system healthy matters before expanding into more valuable species.

The developer describes aquaculture as slower paced and easier to maintain than rat ranching. That makes it an appealing business to learn, although it still depends on water management, food and energy rather than generating stock without upkeep.

Get the Equipment and Start With Tilapia

The Retired Aquafarmer sells equipment for raising fish. The official starter setup consists of a basic water circulation system, tilapia and fish food. Start by understanding that combination instead of buying unfamiliar species simply because their eventual products look valuable.

The announced Aquafarmer starting scenario for version 1.0 also begins with tilapia and recirculating aquaculture systems. That launch scenario and the aquaculture feature already added to the demo are related, but they are separate pieces of version information.

For the developer's description of the demo feature, see the official Aquafarmer update.

Maintain Water, Filtration and Energy

The developer identifies three connected requirements: the tank's water quality, filtration and energy cell. Maintain those so that the water keeps circulating and the fish remain healthy. Fish food and each species' habitat requirements also matter.

Use this as a practical inspection order:

  • Check that the circulation setup has energy available.
  • Check the tank's water quality and filtration.
  • Keep appropriate food available for the fish you are raising.
  • Recheck habitat requirements before moving into a different species.

The announcement does not supply a universal purity percentage, food allowance or battery capacity for every fish. Follow the requirements shown for your actual stock rather than assuming that every species can share the same conditions.

Grow Fish, Then Choose a Product

Under suitable conditions, fish may reproduce by laying and fertilizing roe. Those eggs eventually hatch into fry, and the fry grow into mature fish. The official description does not promise that a newly stocked tank will immediately produce a new generation.

Tilapia comes first, with eels and sturgeons among the more valuable species discussed by the developer. Tanks can also be upgraded with suitable materials. Before expanding, consider whether you can maintain the new stock's environment and keep the circulation powered.

A knife is the confirmed tool for slaughtering and butchering fish into meat. Sturgeons have another documented use: Surgery Tools can harvest caviar from them. These are different processing actions, so choose the product you want before reaching for a tool.

Fish Farming FAQ

Where do I get fish farming equipment?

The October 19 demo update introduces the Retired Aquafarmer as the merchant who sells the equipment. The described starter stock includes tilapia, food and a basic circulation system.

How do fish reproduce?

The official explanation connects reproduction to suitable habitat conditions. Fish lay and fertilize roe, which later becomes fry and then mature fish.

Can I use the announcement's screenshots as a demo UI guide?

The developer explicitly says its GIFs show the updated interface coming with the full release. The feature is in the demo, but the displayed UI was not yet its demo interface.

Is meat the only fish product?

No. The developer specifically confirms caviar from sturgeons using Surgery Tools, in addition to knife-based meat harvesting.