catchability: This function calculates the probability of entry into the...

In vpourfaraj/lobsterCatch: Models capture processes in American lobster fishery

This function calculates the probability of entry into the trap, also known as catchability. It includes the parameters described in Addison and Bell (1997), and can incorporate the length of the catch while calculating the catchability.

Description

This function calculates the probability of entry into the trap, also known as catchability. It includes the parameters described in Addison and Bell (1997), and can incorporate the length of the catch while calculating the catchability.

Usage

catchability(
  q0,
  qmin,
  saturationThreshold,
  Ct,
  lengthBased,
  lobLengthThreshold,
  lobSize = NA,
  sexBased,
  lobSex
)

Arguments

q0	is the initial probability of entry into an empty trap (i.e. 0.5). It must be a number between 0 and 1.
qmin	is the asymptotic minimum probability of entry (i.e. 0).
saturationThreshold	represents the maximum number of lobsters that a trap can hold before the likelihood of another lobster entering the trap decreases to qmin.
Ct	is the number of caught lobster
lengthBased	is a binary value (TRUE/FALSE) which determines whether the length of the lobster in simulation matters or not.
lobLengthThreshold	is a length threshold (i.e. CL in centimeters) beyond which there is no chance of catching another lobster
lobSize	is a size frequency dataset (maybe add some details here?). The default value is NA.
sexBased	is a binary value (TRUE/FALSE) which determines whether the sex of lobster needs too be considered.
lobSex	is the sex of the lobster.

Value

Returns the probability of entry to trap.

References

Julian T. Addison and Michael C. Bell (1997), Simulation modelling of capture processes in trap fisheries for clawed lobsters, Marine Freshwater Research, 48(8), 1035-1044, https://www.publish.csiro.au/MF/MF97169

vpourfaraj/lobsterCatch documentation built on May 17, 2023, 1:37 p.m.