pos: POS: proportion of the SSB made up of older individuals.

In laurieKell/FLCandy: Candidate methods for FLR

POS: proportion of the SSB made up of older individuals.

Description

Older spawners are important for the genetic diversity and resilience of fish populations, as they tend to produce more, and potentially higher quality, eggs. To calculate POS, first identify the older age classes, sum their biomass, then divide by the total spawning stock biomass (SSB). The older age classes can be identified from the maturity ogive mat, for example using the spawnOnce method. This shifts the maturity by 1 age soi that it idenifies the proportion of individuals that have spawned before

Usage

spawnOnce(object, ...)

Arguments

object

An FLQuant object with an ogive with the proportion of older spawners, by default calculated by soawnOnce

Value

Returns the proportion of old spawners by biomass.

Examples

## Not run: 
data(ple4)
pos(ple4)
## End(Not run)

laurieKell/FLCandy documentation built on April 17, 2025, 5:23 p.m.