Boids

Boids

Boids simulation for flocking fish 🐟

by
3.3M Downloads
fabricmobs
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Screenshots

Fish
Fish

About this Mod

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:

Available Versions

2.0.0+26.2release
MC 26.2fabric
July 18, 2026
2.0.0+26.1release
MC 26.1, 26.1.1, 26.1.2fabric
March 29, 2026
2.0.1+1.21.11release
MC 1.21.11fabric
February 20, 2026
2.0.3+1.21.2release
MC 1.21.2, 1.21.3, 1.21.4, 1.21.5, 1.21.6, 1.21.7, 1.21.8fabric
February 20, 2026
2.0.4+1.21release
MC 1.21, 1.21.1fabric
February 20, 2026

How to Install Boids on Your Server

1

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

2

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (26.2).

3

Install Mod

Open the mod browser in the dashboard and search for "Boids". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

fabric

Minecraft Versions

26.2, 26.1.2, 26.1.1 (+21 more)

Server-side

Required

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

Boids server crashes on startup – what to do?

Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (26.2). You can switch loaders with one click in the panel.

Is Boids compatible with fabric?

Boids officially supports fabric for Minecraft 26.2, 26.1.2, 26.1.1. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with Boids – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Boids consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.

Rent Modded Server

Install Boids with just one click on your server.

Recommended RAM
4 GBfrom €5.2/mo
Minimum 3 GB | per 8 players
Create Server Now
1-Click Mod Install
NVMe SSD Storage
DDoS Protection included

Details

License
MIT License
Server-side
Required

Supported Versions

26.226.1.226.1.126.11.21.111.21.101.21.91.21.81.21.71.21.6+14 more