fish2eggs: Generate eggs from fish

In remi-daigle/BESTMPA:

Description

Generates eggs from fish, eggs remain in parents' cell Number of eggs produced is based on the age to length to weight relationships, the age at maturity, and fecundity levels.

Usage

fish2eggs(fish, fecundity = 0.5 * 10^6, age_mat_steepness = 2.5,
  age_mat_sigmoid = 4, l_to_w_int = 1.1e-05, l_to_w_power = 2.91,
  Linf_mean = 112.03, Linf_SD = 10.46/1.96, k_mean = 0.13,
  k_SD = 0.021/196, t0 = 0.18)

Arguments

fish	a matrix of fish numbers by site (rows) and by age (columns). Can easily be generated by initpop
fecundity	Size dependent fecundity (eggs per kg of female)
age_mat_steepness	Steepness of the logistic curve for age at sexual maturity. By default, fish begin maturing at 2 y, 50% at 4 y and all are mature at 6y
age_mat_sigmoid	Sigmoid of the logistic curve for age at sexual maturity. By default, fish begin maturing at 2 y, 50% at 4 y and all are mature at 6y
l_to_w_int	The intercept in the Length-weight relationship
l_to_w_power	The power in the Length-weight relationship
Linf_mean	Von Bertalanffy growth model parameter - mean asymptotic length (cm)
Linf_SD	Von Bertalanffy growth model parameter - standard deviation asymptotic length (cm)
k_mean	Von Bertalanffy growth model parameters - mean growth coefficient (1/year)
k_SD	Von Bertalanffy growth model parameters - standard deviation growth coefficient (1/year)
t0	Von Bertalanffy growth model parameters - x intercept (year)

Examples

# create a fish matrix
fish <- initpop(initial_abun=250*10^6,cells=length(BESTMPA_domain),maxage=50,rate=0.7)
# create eggs
eggs <- fish2eggs(fish,fecundity=0.5*10^6,age_mat_steepness=2.5,age_mat_sigmoid=4,l_to_w_int=0.000011,l_to_w_power=2.91,Linf_mean=112.03,Linf_SD=10.46/1.96,k_mean=0.13,k_SD=0.021/196,t0=0.18)

remi-daigle/BESTMPA documentation built on May 27, 2019, 4:55 a.m.