Fleet-class: Class "Fleet"
In DLMtool/DLMtool: Data-Limited Methods Toolkit

Description Slots MPA slot Creating Object Author(s) Examples

The component of the operating model that controls fishing dynamics

Name: Name of the Fleet object. Single value. Character string.
nyears: The number of years for the historical 'spool-up' simulation. Single value. Positive integer
Spat_targ: Distribution of fishing in relation to spatial biomass: fishing distribution is proportional to B^Spat_targ. Uniform distribution lower and upper bounds. Real numbers
EffYears: Years representing join-points (vertices) of time-varying effort. Vector. Non-negative real numbers
EffLower: Lower bound on relative effort corresponding to EffYears. Vector. Non-negative real numbers
EffUpper: Upper bound on relative effort corresponding to EffYears. Vector. Non-negative real numbers
Esd: Additional inter-annual variability in fishing mortality rate. Uniform distribution lower and upper bounds. Non-negative real numbers
qinc: Average percentage change in fishing efficiency (applicable only to forward projection and input controls). Uniform distribution lower and upper bounds. Non-negative real numbers
qcv: Inter-annual variability in fishing efficiency (applicable only to forward projection and input controls). Uniform distribution lower and upper bounds. Non-negative real numbers
L5: Shortest length corresponding to 5 percent vulnerability. Uniform distribution lower and upper bounds. Positive real numbers
LFS: Shortest length that is fully vulnerable to fishing. Uniform distribution lower and upper bounds. Positive real numbers
Vmaxlen: The vulnerability of fish at Stock@Linf. Uniform distribution lower and upper bounds. Fraction
isRel: Selectivity parameters in units of size-of-maturity (or absolute eg cm). Single value. Boolean.
LR5: Shortest length corresponding ot 5 percent retention. Uniform distribution lower and upper bounds. Non-negative real numbers
LFR: Shortest length that is fully retained. Uniform distribution lower and upper bounds. Non-negative real numbers
Rmaxlen: The retention of fish at Stock@Linf. Uniform distribution lower and upper bounds. Non-negative real numbers
DR: Discard rate - the fraction of caught fish that are discarded. Uniform distribution lower and upper bounds. Fraction
SelYears: (Optional) Years representing join-points (vertices) at which historical selectivity pattern changes. Vector. Positive real numbers
AbsSelYears: (Optional) Calendar years corresponding with SelYears (eg 1951, rather than 1), used for plotting only. Vector (of same length as SelYears). Positive real numbers
L5Lower: (Optional) Lower bound of L5 (use ChooseSelect function to set these). Vector. Non-negative real numbers
L5Upper: (Optional) Upper bound of L5 (use ChooseSelect function to set these). Vector. Non-negative real numbers
LFSLower: (Optional) Lower bound of LFS (use ChooseSelect function to set these). Vector. Non-negative real numbers
LFSUpper: (Optional) Upper bound of LFS (use ChooseSelect function to set these). Vector. Non-negative real numbers
VmaxLower: (Optional) Lower bound of Vmaxlen (use ChooseSelect function to set these). Vector. Fraction
VmaxUpper: (Optional) Upper bound of Vmaxlen (use ChooseSelect function to set these). Vector. Fraction
CurrentYr: The current calendar year (final year) of the historical simulations (eg 2011). Single value. Positive integer.
MPA: (Optional) Matrix specifying spatial closures for historical years.

Each row should contain year index (e.g 10 for 10th historical year) followed by fraction of area closed to fishing for each area. i.e. each row represents a change and the number of columns is nareas + 1. The spatial closures are assumed to remain in place for the future projections unless changed by a MP. Default (if left blank) is all areas are open to fishing in historical period.

Objects can be created by calls of the form new('Fleet')

T. Carruthers and A. Hordyk