Line Art Drawing of a Fish

Depletion Corrected Average Catch


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Version 2.1.1 (October 2012)

Research Model


The Depletion-Corrected Average Catch is a method for estimating sustainable yields for data-poor fisheries.  Based on the idea that the average catch has been sustainable if abundance has not changed, DCAC makes a correction to that average if abundance has increased or decreased (which may be the subject of an educated guess based on subjective impressions).  The magnitude of the correction depends on the approximate natural mortality rate, which should be about 0.2 or smaller to apply this model.  Uncertainty is recognized in all of the parameters in the model, and is reflected in the output probability distribution.

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Alverson, D., and W. Pereyra. 1969. Demersal fish explorations in the northeastern Pacific Ocean – an evaluation of exploratory fishing methods and analytical approaches to stock size and yield forecasts. J. Fish Res. Board Can. 26:1985-2001.

Deriso, R. 1982. Relationship of fishing mortality to natural mortality and growth at the level of maximum sustainable yield. Can. J. Fish. Aquat. Sci. 39:1054-1-58.

Gulland, J. 1970. Preface. In: J. Gulland (ed.) The fish resources of the oceans. FAO Fish. Tech. Pap. 97, p.1-4.

He, X., D, Pearson, E. Dick, J. Field, S. Ralston, and A. MacCall. 2007. Status of the widow rockfish resource in 2007, an update. Pacific Fishery Management Council, Portland OR.


MacCall, A. 2007. Depletion-adjusted average catch. pp. 27-31 In: Rosenberg, A., Agnew, D., Babcock, E., Mogensen, C., O’Boyle, R., Powers, J., Stefansson, G., Swasey, J. 2007. Setting annual catch limits for U.S. fisheries: An expert working group report. Lenfest Ocean Program, 1025 F Street NW, Suite 900, Washington, D.C. 

Walters, C., and S. Martell. 2004. Fisheries ecology and management. Princeton University Press. 399 p.

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Version History


DCAC Version 2.1 (February 2011) 

DCAC Version 1.2 (January 2009) 

DCAC Version 1.1 (January 2009) 

DCAC Versions through were Beta version with various technical improvements.


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Older Version Changes 



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NOAA Fisheries Toolbox Version 3.1

website last modified May 16, 2016