calc.WatZ: Convert Tanner crab size to weight using the current (2015)...

In wStockhausen/tcsamFunctions: Functions related to the BSAI Tanner crab stock assessment (2015+)

Convert Tanner crab size to weight using the current (2015) relationships

Description

Power-law functions for Tanner crab weight-at-size (g) by sex and maturity based on 2015 NMFS survey.

Usage

calc.WatZ(
  z,
  sex,
  maturity,
  male = list(immature = list(a = 0.00027, b = 3.022134), mature = list(a = 0.00027, b =
    3.022134), undetermined = list(a = 0.00027, b = 3.022134)),
  female = list(immature = list(a = 0.000562, b = 2.816928), mature = list(a = 0.000441,
    b = 2.898686))
)

Arguments

z	: vector of sizes (mm CW)
sex	: vector of sexes ('MALE' or 'FEMALE')
maturity	: vector of maturity states ('IMMATURE', 'MATURE', or 'UNDETERMINED')
male	: list of regression coefficients for immature, mature crab (see details)
female	: list of regression coefficients for immature, mature crab (see details)

Details

'male' and 'female' are lists with named elements 'a' and 'b', whose values reflect the parameters in the eq: w = a \cdot z^b

Value

a vector of weights in g corresponding to the input sizes, sexes, and maturity states

wStockhausen/tcsamFunctions documentation built on Jan. 28, 2024, 9:01 a.m.