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 General

 Model List

ASPIC Model

Line Art Drawing of a Fish

A Stock Production Model Incorporating Covariates
(ASPIC)

 

|  About  |  Downloads  |  References  |  Version History  |

 

About

Version 5.34.9 (February 2011)

Core Application

 

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.

 

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References

 

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.

 

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Version History

 


Aspic Version 5.34.6 (June 2009)

Includes Aspic calculation engine version 5.34.6 and  the Graphical User Interface has been updated to the .Net framework.  No changes to the Aspic Projection calculation engine version 3.16 (January 2007).


Aspic Version 5.33 (February 2009)

Includes Aspic calculation engine version 5.33 and minor updates to the Graphical User Interface.  No changes to the Aspic Projection calculation engine version 3.16 (January 2007).


Aspic Version 5.16 (September 2007)

Includes Aspic calculation engine version 5.16 (January 2007) and Aspic Projection calculation engine version 3.16 (January 2007).

 

Changes to the Aspic calculation engine include since the previous Toolbox version:

  • Added an option to output an R or S compatible .RDAT file.

  • Fixed a bug in which some biomass index series were handled wrong and estimation failed completely.

 

No changes to Aspic Projection since the previous Toolbox version.

 

Aspic Version 5.10.3 and Aspic Projection Version 3.16.4 (April 2007)

 

  • A graphic interface update only; no changes to the calculation engine

  • New spreadsheet-like grid editing capability

  • Allows spaces in the file name or directory

  • Updated plotting package to fix a conflict introduced by a recent Windows update

  

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Older Version Changes 

 

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.

  

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website last modified May 16, 2016

 
 

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