How do I simulate a fish population?

Open this page and use the live Genetic Drift tool below — set your inputs and the simulation runs instantly in your browser using real numerics. No install, no account needed.

Yes. The simulation runs free in your browser. A one-time unlock or a Pro plan adds advanced parameters, saved presets, data import, and clean exports.

Can I use my own numbers?

Absolutely — every input is adjustable, and with data import you can drive a fish population from your own measurements.

Use case · powered by Genetic Drift

Genetic Drift for a fish population

Simulate a fish population live in your browser. This runs the real Genetic Drift solver — adjust the inputs, watch it respond instantly, and export the result. No install, no account.

For:Students Researchers Educators Engineers Hobbyists & Makers K-12 Students First Responders

Genetic Drift (Wright-Fisher)Live

chance changes allele frequencies

Controls

Presets

Population size N

Initial frequency p₀

Replicate populations

Even with no selection, allele frequencies wander purely by chance as each generation is randomly sampled from the last. In small populations this genetic drift is fast and alleles quickly fix or vanish; in large populations it is slow. Each colored line is an independent population starting from the same frequency.

▶ Run in Python

Data Inspector

Fixed (reached 1)0

Lost (reached 0)0

Population size50

Governing equation

Var (p) = \frac{p _{0} ( 1 - p _{0} )}{2 N} = \frac{0.5 ( 1 - 0.5 )}{2 \cdot 50} = 0.0025

Reading this result: Over many replicates the fraction that fix an allele converges on its starting frequency p₀=0.5 — drift is directionless, but the odds of fixation equal where you began.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

or unlock everything with Pro →

About this simulation

The full Genetic Drift tool models a fish population with the same numerics engineers and scientists use — running entirely client-side. Change any parameter and the result updates in real time, so you can build intuition, check a design, or teach the concept without spreadsheets or installs.

More you can do with Genetic Drift

Genetic Drift for a bacterial growth Genetic Drift for a predator-prey cycle Genetic Drift for a neuron firing Genetic Drift for a heartbeat Genetic Drift for a virus spread Genetic Drift for a gene expression Genetic Drift for a protein fold Genetic Drift for a muscle contraction

Other ways to simulate a fish population

Dynamical Systems for a fish population Epidemic Network for a fish population Spatial Predator–Prey for a fish population SIR Epidemic for a fish population Hodgkin-Huxley Neuron for a fish population Lotka-Volterra for a fish population

Frequently asked questions

How do I simulate a fish population?: Open this page and use the live Genetic Drift tool below — set your inputs and the simulation runs instantly in your browser using real numerics. No install, no account needed.
Is it free?: Yes. The simulation runs free in your browser. A one-time unlock or a Pro plan adds advanced parameters, saved presets, data import, and clean exports.
Can I use my own numbers?: Absolutely — every input is adjustable, and with data import you can drive a fish population from your own measurements.