How to use the survival from fishing and natural mortality calculator
Find the annual survival of a fish or animal population from fishing and natural mortality rates. Enter fishing mortality rate per year, natural mortality rate per year in the fields above; the total mortality z, annual survival are computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “survival from mortality”, “total mortality Z”, “annual survival rate”, “calculate survival from fishing and natural mortality”, “find total mortality z”.
Formula
Variables
- F — Fishing mortality rate per year
- M — Natural mortality rate per year
Worked example
With fishing mortality rate per year = 0.2, natural mortality rate per year = 0.1, the calculator gives total mortality z ≈ 0.3 per year; annual survival ≈ 74.08182 %.
Frequently asked questions
What is the survival from fishing and natural mortality calculator used for?
Find the annual survival of a fish or animal population from fishing and natural mortality rates. It helps with questions such as “survival from mortality”, “total mortality Z”, “annual survival rate”.
What is the formula for the survival from fishing and natural mortality calculation?
Total mortality Z (per year) = F+M. Annual survival (%) = 100 × exp(-(F+M)). Here F is fishing mortality rate per year, M is natural mortality rate per year.
What inputs do I need for the survival from fishing and natural mortality calculator?
You need fishing mortality rate per year, natural mortality rate per year. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the survival from fishing and natural mortality calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the survival from fishing and natural mortality result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.