LatA {MQMF}

LatA Simulated length-at-age for 358 female fish

Description

A data.frame containing the simulated age for an array of different lengths based upon the properties of an extensive collection of redfish (Centroberyx affinis) length-at-age data from eastern Australia sampled in the 1990's.

Format

A data.frame with 358 rows and 2 variables:

age

simulated ages in years

length

consequent simulated fork length of the fish, in cms

Subjects

• Estimating individual growth from length-at-age data

• von Bertalanffy growth curve

• Gompertz growth curve

• Michaelis-Menton curve used as a growth curve

Source

The data this simulation is based upon is from length-at-age data for one species collected over many years by the many excellent people running the Integrated Stock Monitoring Program in the Australian South East Fishery over the years of its existence. The simulation is based on a characterization of redfish properties and includes random error in the hypothetical measurements as well as the processes of growth (i.e. both measurement and process error). The other inputs were a selected set of growth parameters and the relative frequency of different ages vs lengths.

Examples

  data(LatA)
  pars <- c(27.0,0.15,-2.0) # von Bertalanffy
  bestvB <- nlm(f=ssq,funk=vB,observed=LatA$length,p=pars,
                ages=LatA$age,typsize=magnitude(pars))
  outfit(bestvB,backtran=FALSE,title="vB")