InstaneousMortalityRate: Instantaneous mortality rate (Z)

In nmfs-fish-tools/data_dictionary: Collaborative tool to improve consistency in terminology and develop a framework of tools for fisheries science.

Instantaneous mortality rate (Z)

Description

The sum of instantaneous natural mortality (M) and fishing mortality (F) rates or the fraction of the population that dies in a very short, i.e., instantaneous, period of time. Instantaneous rates are sometimes more easily interpreted as an annual rate, which can be done using the following formula: A = 1 - e^{-x}.

Usage

InstaneousMortalityRate

Format

Examples

An instantaneous mortality rate of 0.0 means that all individual survive and the resulting annual survival rate is 100%.

Rationale

Standardizing notation for instantaneous rates of mortality is easy because Z appears to be one of the most well-adopted acronyms across a great number of disciplines.

Alternatives

Range of possible values

0–Inf

Units

time^{-1}

nmfs-fish-tools/data_dictionary documentation built on July 27, 2024, 12:20 p.m.