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Boids

Boids simulation for flocking fish 🐟

Fabric
Loaders
Fabric
Downloads on Modrinth
3.6M
Followers on Modrinth
755
versions
30
Updated
September 16, 2026Sep 16
Published
in 2023
Fish — A flock of fish in front of a white concrete wall · swipe

At a glance

Runs on Fabric
For Minecraft 1.20–26.3
Server only — players don't need to install it
Latest version — 2.0.0+26.3 from September 16, 2026
Requires Fabric API
License MIT — free
Where it's needed
In gamenot neededOn serverrequired

Install on the server only; players don't need it

Game versions1.20–26.3

Boids

This mod replaces the vanilla fish behavior of flocking fish with a boids simulation.

A flock of fish in front of a white concrete wall

ModFest 1.20

What's a Boids Simulation?

A "boids simulation" refers to a computer model that simulates the flocking or herding behavior observed in nature, like the coordinated movement of birds or fish. In the context of this mod, it means fish will exhibit more realistic and dynamic group movements, making your aquatic environments come to life.

In particular, each fish will follow these three rules:

  • Separation: steer to avoid crowding local flockmates
  • Alignment: steer towards the average heading of local flockmates
  • Cohesion: steer to move towards the average position (center of mass) of local flockmates

Additional Resources

You can learn more about boids simulations here:

FAQ

How to install Boids?

Install Fabric for your Minecraft version, download Boids for the same version and loader, put the file into the mods folder and launch the game with the loader profile.

Which Minecraft versions does Boids support?

Boids has builds for Minecraft 1.20–26.3.

Is Boids needed on the server?

Server only — players don't need to install it

License and source
MIT Licensefree to use and share with credit to the author
Original — Modrinth↗Files unchanged, verified with SHA-512Is this your mod? For rights holders

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