Farfish DLMtool

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Glossary

Code

Name

Type

Description

INPUT CONTROLS

curE

Current effort

Effort

A reference input control that maintains current effort (subject to fishing efficiency changes)

curE75

75% of Current effort

Effort

A reference input control that maintains 75% of current effort

DDe

Delay-Difference- effort control

Effort

Effort control version of DD - Delay - Difference Stock Assessment with UMSY and MSY leading

DDe75

Delay-Difference- effort control 75%

Effort

Effort control version of DD - Delay - Difference Stock Assessment with UMSY and MSY leading that fishes at 75 per cent of FMSY

DDess

Delay-Difference- effort control 75% effort searching

Effort

Effort searching version of DD - Delay - Difference Stock Assessment with UMSY and MSY leading that fishes at 75 per cent of FMSY

ItargetE1

Effort adjusted target CPUE

Effort

Both of these management procedure incrementally adjusts the effort to reach a target CPUE / relative abundance index.

ItargetE4

Effort adjusted target CPUE

Effort

LstepCE1

Effort adjusted to recent mean length version 1

Effort

Management procedures that incrementally adjusts the effort according to the mean length of recent catches.

LstepCE2

Effort adjusted to recent mean length version 2

Effort

Ltarget1

Effort adjusted to rmean length version 1

Effort

A management procedure that incrementally adjusts the TAC to reach a target mean length in catches.

Ltarget1

Effort adjusted to mean length version 2

Effort

matlenlim

Length selectivity equal to maturity

Sel.

Fishing selectivity is set according to the maturity curve

matlenlim2

Length selectivity higher than maturity

Sel.

fishing selectivity is set slightly higher than the maturity curve

matagelim

Age selectivity matches the maturity curve

Sel.

Fishing selectivity at age is the same as fraction mature at age

MRreal

Area 1 Marine Reserve with reallocation

MPA

Sets a marine reserve in Area 1 and reallocates fishing effort to area 2

MRnoreal

Area 1 Marine Reserve with no reallocation

MPA

Sets a marine reserve in Area 1 with no reallocation of fishing effort to area 2

slotlim

Slot limit

Sel.

Sets a slot limit to control effort.

OUTPUT CONTROLS

AvC

Average Catch

Catch

Sets TAC as average historical catch

BK

Beddington and Kirkwood life-history

LH

Sets an OFL according to current abundance and an approximation of FMSY based on length at first capture.

BK_CC

BK linked to a catch curve

LH

Catch-curve analysis is used to estimate current abundance that is linked to BK FMSY estimate to give the OFL

BK_ML

BK linked to a mean length

LH

Mean length estimate of current F (abundance) is linked to BK FMSY estimate to provide the OFL

CC1

Constant catch linked to average catches

Catch

TAC is a average historical catches

CC4

Constant catch linked to average catches

Catch

TAC is 70% of average historical catches

CompSRA

Age Composition - Stock Reduction Analysis

F

What constant F creates the current composition, what is FMSY? OFL = FMSY x F / C

CompSRA4010

CompSRA linked to a 40-10 rule

F

A 40-10 harvest control rule is added to the CompSRA MP

DAAC

Depletion Adjusted Average Catch

Catch

DCAC multiplied by 2*depletion and divided by BMSY/B0 (Bpeak)

HDAAC

Hybrid Depletion Adjusted Average Catch

Catch

DCAC multiplied by 2*depletion and divided by BMSY/B0 (Bpeak) when below BMSY, and DCAC above BMSY.

DBSRA

Depletion-Based Stock Reduction Analysis

Catch

The OFL is M x (FMSY/M) x depletion x unfished biomass (the first three factors are user defined, the fourth is determined by historical catches and stock reduction analysis)

DBSRA_40

DBSRA assuming current depletion is 40%

Catch

DBSRA where stock depletion is fixed at 40%

DBSRA_ML

DBSRA using mean length to estimate depletion

Catch

Mean length estimate of depletion is used to inform DBSRA depletion

DBSRA4010

DBSRA linked to a 40-10 rule

Catch

A 40-10 harvest control rule is added to the DBSRA MP

DCAC

Depletion-Corrected Average Catch

Catch

An MSY proxy that accounts for catches occuring whilst dropping to productive stock sizes

DCAC_ML

DCAC using mean length to estimate depletion

Catch

Mean length estimate of depletion is used to inform DCAC depletion

DCAC40

DCAC assuming depletion is 40%

Catch

DCAC where stock depletion is fixed at 40%

DCAC4010

DCAC linked to a 40-10 rule

Catch

A 40-10 harvest control rule is added to the DCAC MP

EDCAC

Extra DCAC

Catch

DCAC * 2 * depletion * B0 / BMSY

DD

Delay-Difference assessment

Pop.D

A delay difference model is fitted to historical abundance indices and catches. The model does not estimate process error.

DD4010

DD linked to a 40-10 rule

Pop.D

A 40-10 harvest control rule is added to the DD MP

DepF

Fratio linked to a production curve control rule

EmInd

Below BMSY, the OFL is mulitplied by a production curve ie. dep x (1-dep) x 4

DynF

Dynamic Fratio MP

PopDy

Inferred derivative of surplus production with biomass is used to adjust F in relation to M

Fadapt

Adaptive F MP

PopDy

Inferred derivative of surplus production with biomass is used to adjust F between bounds FMSY/2 and 2FMSY

Fdem

Demographic FMSY method

LH

FMSY is calculated as r/2 where r is calculated from a demographic approach (inc steepness). Coupled with an estimate of current abundance that gives you the OFL.

Fdem_CC

Fdem linked to a catch curve

LH

Current abundance estimates from a catch curve are linked to Fdem estimate of FMSY

Fdem_ML

Fdem using mean length to estimate depletion

LH

Mean length estimate of current abundance is lined to Fdem estimate of FMSY

FMSYref

FMSY ref

LH

A reference FMSY method (uses perfect information about FMSY)

FMSYref50

Half of FMSY ref

LH

50% of true simulated OFL

FMSYref75

75% of FMSY ref

LH

75% of true simulated OFL

Fratio

Fixed FMSY to M ratio

LH

FMSY is a fixed fraction of natural mortality rate

Fratio4010

Fratio with 40-10 rule

LH

Calculates the OFL based on a fixed FMSY/M multiplied by a current estimate of abundance. In this method DBSRA is paired with the 40-10 rule; OFL = 0 at B10%.

Fratio_CC

Fratio linked to a catch curve

LH

Current abundance estimates from a catch curve are linked to the Fratio MP

Fratio_ML

Fratio using mean length to estimate depletion

Length

Mean length estimate of depletion is used to inform Fratio abundance

Fratio4010

Fratio linked to a 40-10 rule

LH

A 40-10 harvest control rule is added to the Fratio MP

GB_CC

Geromont and Butterworth constant catch

Catch

MSY seeking rule that uses average historical catch as a proxy for MSY

GB_slope

Geromont and Butterworth CPUE slope

EmInd

TAC recommendations to stabilize CPUE

GB_target

Geromont and Butterworth target CPUE and catch

EmInd

TAC recommendations to achieve target CPUE and target catch

Gcontrol

G-control MP

PopDy

Inferred derivative of surplus production with biomass is used to alter the TAC

Islope1

CPUE slope MP

EmInd

TAC is adjusted to maintain constant CPUE

Islope4

CPUE slope MP (more biologically precautionary)

EmInd

TAC is adjusted to maintain constant CPUE

Itarget1

CPUE target MP

EmInd

TAC is adjusted to achieve a target CPUE

Itarget4

CPUE target MP (more biologically precautionary)

EmInd

TAC is adjusted to achieve a target CPUE

LstepCC1

Mean length MP

Length

Mean length relative to historical levels is used to alter the TAC

LstepCC4

Mean length MP (more biologically precautionary)

Length

Mean length relative to historical levels is used to alter the TAC

Ltarget1

Length target MP

Length

TAC is adjusted to reach a target mean length

Ltarget4

Length target MP (more biologically precautionary)

Length

TAC is adjusted to reach a target mean length

MCD

Mean Catch Depletion MP

Catch

MP to demonstrate high information content of depletion OFL = mean catches x 2 x dep

MCD4010

MCD linked to a 40-10 rule

Catch

A 40-10 harvest control rule is added to the MCD MP

Nref

No reference point

Catch

Sets catch = 0.

Rcontrol

R-control MP

LH

A demographic prior for intrinsic rate of increase is used to firm up surplus production calculation of G-control

Rcontrol2

Rcontrol with quadratic SP-B relationship

LH

As Rcontrol but fits a quadratic relationship to the derivative of SP with stock biomass

SBT1

Southern Bluefin Tuna 1

EmInd

An MP that adjusts TACs according to apparent trend in CPUE

SBT2

Southern Bluefin Tuna 2

EmInd

An MP that adjusts TACs according to achieve target CPUE and catch

SPmod

Surplus production based TAC modifier

PopDy

Inferred derivative of surplus production with biomass is used to adjust the TAC

SPMSY

Catch-trend MSY MP

Catch

Catch trends reflect depletion and combined with catches can be used to find viable r-K pairs. The OFL is dep x (1-dep) x 2 x r x K

SPslope

Slope in surplus production MP

PopDy

Inferred derivative of surplus production with biomass is used to adjust the TAC

SPSRA

Surplus Production Stock Reduction Analysis

PopDy

Like DBSRA but uses a surplus prodcution model and a prior for intrinisic rate of increase

SPSRA_ML

SPSRA using mean length to estimate depletion

Length

mean length estimate of depletion is used to inform SPSRA depletion

YPR

Yield Per Recruit

LH

Yield Per Recruit estimate of F0.1 (FMSY proxy) multiplied by estimate of current stock biomass

YPR_CC

YPR linked to a catch-curve

LH

Current abundance estimates of a catch curve analysis is linked to the YPR MP

YPR_ML

YPR using mean lenth to estimate current abundance

LH;Lt

Mean length estimate of current abundance is used to inform YPR abundance

Glossary

Code

Name

Type

Description

INPUT CONTROLS

curE

Current effort

Effort

A reference input control that maintains current effort (subject to fishing efficiency changes)

curE75

75% of Current effort

Effort

A reference input control that maintains 75% of current effort

DDe

Delay-Difference- effort control

Effort

Effort control version of DD - Delay - Difference Stock Assessment with UMSY and MSY leading

DDe75

Delay-Difference- effort control 75%

Effort

Effort control version of DD - Delay - Difference Stock Assessment with UMSY and MSY leading that fishes at 75 per cent of FMSY

DDess

Delay-Difference- effort control 75% effort searching

Effort

Effort searching version of DD - Delay - Difference Stock Assessment with UMSY and MSY leading that fishes at 75 per cent of FMSY

ItargetE1

Effort adjusted target CPUE

Effort

Both of these management procedure incrementally adjusts the effort to reach a target CPUE / relative abundance index.

ItargetE4

Effort adjusted target CPUE

Effort

LstepCE1

Effort adjusted to recent mean length version 1

Effort

Management procedures that incrementally adjusts the effort according to the mean length of recent catches.

LstepCE2

Effort adjusted to recent mean length version 2

Effort

Ltarget1

Effort adjusted to rmean length version 1

Effort

A management procedure that incrementally adjusts the TAC to reach a target mean length in catches.

Ltarget1

Effort adjusted to mean length version 2

Effort

matlenlim

Length selectivity equal to maturity

Sel.

Fishing selectivity is set according to the maturity curve

matlenlim2

Length selectivity higher than maturity

Sel.

fishing selectivity is set slightly higher than the maturity curve

matagelim

Age selectivity matches the maturity curve

Sel.

Fishing selectivity at age is the same as fraction mature at age

MRreal

Area 1 Marine Reserve with reallocation

MPA

Sets a marine reserve in Area 1 and reallocates fishing effort to area 2

MRnoreal

Area 1 Marine Reserve with no reallocation

MPA

Sets a marine reserve in Area 1 with no reallocation of fishing effort to area 2

slotlim

Slot limit

Sel.

Sets a slot limit to control effort.

OUTPUT CONTROLS

AvC

Average Catch

Catch

Sets TAC as average historical catch

BK

Beddington and Kirkwood life-history

LH

Sets an OFL according to current abundance and an approximation of FMSY based on length at first capture.

BK_CC

BK linked to a catch curve

LH

Catch-curve analysis is used to estimate current abundance that is linked to BK FMSY estimate to give the OFL

BK_ML

BK linked to a mean length

LH

Mean length estimate of current F (abundance) is linked to BK FMSY estimate to provide the OFL

CC1

Constant catch linked to average catches

Catch

TAC is a average historical catches

CC4

Constant catch linked to average catches

Catch

TAC is 70% of average historical catches

CompSRA

Age Composition - Stock Reduction Analysis

F

What constant F creates the current composition, what is FMSY? OFL = FMSY x F / C

CompSRA4010

CompSRA linked to a 40-10 rule

F

A 40-10 harvest control rule is added to the CompSRA MP

DAAC

Depletion Adjusted Average Catch

Catch

DCAC multiplied by 2*depletion and divided by BMSY/B0 (Bpeak)

HDAAC

Hybrid Depletion Adjusted Average Catch

Catch

DCAC multiplied by 2*depletion and divided by BMSY/B0 (Bpeak) when below BMSY, and DCAC above BMSY.

DBSRA

Depletion-Based Stock Reduction Analysis

Catch

The OFL is M x (FMSY/M) x depletion x unfished biomass (the first three factors are user defined, the fourth is determined by historical catches and stock reduction analysis)

DBSRA_40

DBSRA assuming current depletion is 40%

Catch

DBSRA where stock depletion is fixed at 40%

DBSRA_ML

DBSRA using mean length to estimate depletion

Catch

Mean length estimate of depletion is used to inform DBSRA depletion

DBSRA4010

DBSRA linked to a 40-10 rule

Catch

A 40-10 harvest control rule is added to the DBSRA MP

DCAC

Depletion-Corrected Average Catch

Catch

An MSY proxy that accounts for catches occuring whilst dropping to productive stock sizes

DCAC_ML

DCAC using mean length to estimate depletion

Catch

Mean length estimate of depletion is used to inform DCAC depletion

DCAC40

DCAC assuming depletion is 40%

Catch

DCAC where stock depletion is fixed at 40%

DCAC4010

DCAC linked to a 40-10 rule

Catch

A 40-10 harvest control rule is added to the DCAC MP

EDCAC

Extra DCAC

Catch

DCAC * 2 * depletion * B0 / BMSY

DD

Delay-Difference assessment

Pop.D

A delay difference model is fitted to historical abundance indices and catches. The model does not estimate process error.

DD4010

DD linked to a 40-10 rule

Pop.D

A 40-10 harvest control rule is added to the DD MP

DepF

Fratio linked to a production curve control rule

EmInd

Below BMSY, the OFL is mulitplied by a production curve ie. dep x (1-dep) x 4

DynF

Dynamic Fratio MP

PopDy

Inferred derivative of surplus production with biomass is used to adjust F in relation to M

Fadapt

Adaptive F MP

PopDy

Inferred derivative of surplus production with biomass is used to adjust F between bounds FMSY/2 and 2FMSY

Fdem

Demographic FMSY method

LH

FMSY is calculated as r/2 where r is calculated from a demographic approach (inc steepness). Coupled with an estimate of current abundance that gives you the OFL.

Fdem_CC

Fdem linked to a catch curve

LH

Current abundance estimates from a catch curve are linked to Fdem estimate of FMSY

Fdem_ML

Fdem using mean length to estimate depletion

LH

Mean length estimate of current abundance is lined to Fdem estimate of FMSY

FMSYref

FMSY ref

LH

A reference FMSY method (uses perfect information about FMSY)

FMSYref50

Half of FMSY ref

LH

50% of true simulated OFL

FMSYref75

75% of FMSY ref

LH

75% of true simulated OFL

Fratio

Fixed FMSY to M ratio

LH

FMSY is a fixed fraction of natural mortality rate

Fratio4010

Fratio with 40-10 rule

LH

Calculates the OFL based on a fixed FMSY/M multiplied by a current estimate of abundance. In this method DBSRA is paired with the 40-10 rule; OFL = 0 at B10%.

Fratio_CC

Fratio linked to a catch curve

LH

Current abundance estimates from a catch curve are linked to the Fratio MP

Fratio_ML

Fratio using mean length to estimate depletion

Length

Mean length estimate of depletion is used to inform Fratio abundance

Fratio4010

Fratio linked to a 40-10 rule

LH

A 40-10 harvest control rule is added to the Fratio MP

GB_CC

Geromont and Butterworth constant catch

Catch

MSY seeking rule that uses average historical catch as a proxy for MSY

GB_slope

Geromont and Butterworth CPUE slope

EmInd

TAC recommendations to stabilize CPUE

GB_target

Geromont and Butterworth target CPUE and catch

EmInd

TAC recommendations to achieve target CPUE and target catch

Gcontrol

G-control MP

PopDy

Inferred derivative of surplus production with biomass is used to alter the TAC

Islope1

CPUE slope MP

EmInd

TAC is adjusted to maintain constant CPUE

Islope4

CPUE slope MP (more biologically precautionary)

EmInd

TAC is adjusted to maintain constant CPUE

Itarget1

CPUE target MP

EmInd

TAC is adjusted to achieve a target CPUE

Itarget4

CPUE target MP (more biologically precautionary)

EmInd

TAC is adjusted to achieve a target CPUE

LstepCC1

Mean length MP

Length

Mean length relative to historical levels is used to alter the TAC

LstepCC4

Mean length MP (more biologically precautionary)

Length

Mean length relative to historical levels is used to alter the TAC

Ltarget1

Length target MP

Length

TAC is adjusted to reach a target mean length

Ltarget4

Length target MP (more biologically precautionary)

Length

TAC is adjusted to reach a target mean length

MCD

Mean Catch Depletion MP

Catch

MP to demonstrate high information content of depletion OFL = mean catches x 2 x dep

MCD4010

MCD linked to a 40-10 rule

Catch

A 40-10 harvest control rule is added to the MCD MP

Nref

No reference point

Catch

Sets catch = 0.

Rcontrol

R-control MP

LH

A demographic prior for intrinsic rate of increase is used to firm up surplus production calculation of G-control

Rcontrol2

Rcontrol with quadratic SP-B relationship

LH

As Rcontrol but fits a quadratic relationship to the derivative of SP with stock biomass

SBT1

Southern Bluefin Tuna 1

EmInd

An MP that adjusts TACs according to apparent trend in CPUE

SBT2

Southern Bluefin Tuna 2

EmInd

An MP that adjusts TACs according to achieve target CPUE and catch

SPmod

Surplus production based TAC modifier

PopDy

Inferred derivative of surplus production with biomass is used to adjust the TAC

SPMSY

Catch-trend MSY MP

Catch

Catch trends reflect depletion and combined with catches can be used to find viable r-K pairs. The OFL is dep x (1-dep) x 2 x r x K

SPslope

Slope in surplus production MP

PopDy

Inferred derivative of surplus production with biomass is used to adjust the TAC

SPSRA

Surplus Production Stock Reduction Analysis

PopDy

Like DBSRA but uses a surplus prodcution model and a prior for intrinisic rate of increase

SPSRA_ML

SPSRA using mean length to estimate depletion

Length

mean length estimate of depletion is used to inform SPSRA depletion

YPR

Yield Per Recruit

LH

Yield Per Recruit estimate of F0.1 (FMSY proxy) multiplied by estimate of current stock biomass

YPR_CC

YPR linked to a catch-curve

LH

Current abundance estimates of a catch curve analysis is linked to the YPR MP

YPR_ML

YPR using mean lenth to estimate current abundance

LH;Lt

Mean length estimate of current abundance is used to inform YPR abundance