A Stock
Production Model Incorporating Covariates (ASPIC) is a
non-equilibrium implementation of the well-known surplus production
model of Schaefer (1954, 1957). ASPIC also fits the
generalized stock production model of Pella and Tomlinson (1969) using
the alternative parameterization of Fletcher (1978).
The analytic engine for the ASPIC model, written by Dr.
Michael Prager of the Southeast Fisheries Science Center, NMFS,
incorporates several extensions to the classical stock-production
models. ASPIC can fit data from up to 10 data series of
fishery-dependent or fishery-independent indices, and uses
bootstrapping to construct approximate nonparametric confidence
intervals and to correct for bias. In addition, ASPIC can fit
the model by varying the relative importance placed on yield versus
measures of effort or indices of abundance.
The model has been extensively reviewed and tested
in the context of various applications to tuna stocks via the
International Commission for the Conservation of Atlantic Tunas (ICCAT)
by Prager (1992 a, b). The model is more formally described
in Prager (1994) and Quinn and Deriso (1999). Version 5.0 of ASPIC
allows the user to estimate
parameters by direct optimization, by grid search for model shape and
by fixing model shape to fit the Fox (1970) model.
ASPIC has been used as an assessment tool for
swordfish (ICCAT), bluefin tuna (ICCAT), yellowtail
flounder (NEFSC, NAFO), and fluke (NEFSC)
among others.
Fox, W. W., Jr. 1971. Random variability
and parameter estimation for the generalized production model. Fish.
Bull. (U.S.) 69: 569–580.
Pella, J. J. and P. K. Tomlinson 1969. A
generalized stock production model. Bull. Inter-Am. Trop. Tuna Comm.
13: 419–496.
Prager, M. H. 1992. ASPIC: A
Surplus-Production Model Incorporating Covariates. Coll. Vol. Sci.
Pap., Int. Comm. Conserv. Atl. Tunas (ICCAT) 28: 218–229.
Prager, M. H. 1994. A suite of extensions
to a nonequilibrium surplus-production model. Fish. Bull. (U.S.) 92:
374–389.
Prager, M. H., C. Phillip Goodyear, and
G. P. Scott. 1996. Application of a surplus-production model to a
swordfish-like simulated stock with time-changing selectivity. Trans.
AFS 125:729-740.
Schaefer, M. B. 1957. A study of the
dynamics of the fishery for yellowfin tuna in the eastern tropical
Pacific Ocean. Inter-Am. Trop. Tuna Comm. Bull. 2: 247–268.
Aspic
Version 5.10.2 and Aspic Projection Version 3.16.3 (July 2006)
A
graphic interface update only; no changes to the calculation engine
Allow
international users to use "," as the decimal symbol and "." as
the digit grouping symbol (i.e., thousands separator)
Upgraded
version of the plotting package
Aspic
Version 5.10.1 and Aspic Projection Version 3.16.2 (October 2005)
A
graphic interface update only; no changes to the calculation engine
Fixed
a graphic interface bug in Aspic Projection which wrote the
option for smoothing in the input file incorrectly
Fixed
a
bug that didn't open the PDF manual correctly if using the full version
of Adobe Acrobat
Added ability
to copy data from Quattro Pro
or from a text file into the series grids
Enhanced
ability
to read in as much input data as possible if data is mis-specified in
some way
Aspic
Projection Version 3.16.1
(August
2005)
A
graphic interface update, primarily fixing
a bug that wrote the specification for whether to use the Yield or
Relative F Rate in the input file incorrectly
Aspic
Version 5.10 and Aspic Projection Version 3.16 (May 2005)
Eliminated
printing of AIC and Ftest for Fox model to Aspic output file
Added
printing of revised bounds on MSY and K during generalized fit to
Aspic output file
Changed Aspic
calculation engine logic to
restore the user’s bounds on MSY and K before bootstrapping a
generalized fit
In Aspic
Projection, incorporation of either
Bias-Corrected or Percentile confidence intervals with or without
smoothing
In Aspic Projection,
output an additional file
(*.PRB)
Revised PDF Reference
Manual and Using Aspic help
files
Fixed a graphic interface
bug that sometimes won't
allow a file to be saved if the series data type is Biomass or Biomass
Index
Minor graphic interface
updates and bug fixes
Aspic
Version 5.08 (March 2005)
Incorporates several updates
to the graphical user interface.
For changes to the calculation engine since Version 5.05
see the PDF documentation included with the application.
Aspic Version 5.05 (June
2004)
Version 5.05 replaces Version 3.93 (March 2003).
Version 5.05 includes a completely redesigned graphic
interface.
For changes to the calculation engine since Version 3.93
see the PDF documentation included with the application.
