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Optimal harvesting time in a size-heterogeneous population

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  • Gasca-Leyva, Eucario
  • Hernández, Juan M.
  • Veliov, Vladimir M.

Abstract

This paper analyzes the optimal harvesting time for husbanded biological assets consisting of individuals of different sizes. In contrast to previous works which include a random variable in the growth function, it is assumed that the heterogeneity is caused by differences in the initial sizes of the planted culture. Therefore, the evolution of the population with a given growth pattern is described by a size-structured dynamic model. An optimality condition is obtained and compared with the one known in the size-homogeneous case. If the size heterogeneity is taken into account, then under appropriate natural conditions for the biological and economic factors, the resource should be maintained longer compared with the recommendations obtained from the homogeneous models of the same culture. The theoretical findings are confirmed by numerical experiments with a hypothetical culture, and an application to the tilapia farming in Mexico.

Suggested Citation

  • Gasca-Leyva, Eucario & Hernández, Juan M. & Veliov, Vladimir M., 2008. "Optimal harvesting time in a size-heterogeneous population," Ecological Modelling, Elsevier, vol. 210(1), pages 161-168.
    • Handle: RePEc:eee:ecomod:v:210:y:2008:i:1:p:161-168
    DOI: 10.1016/j.ecolmodel.2007.07.018
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    References listed on IDEAS

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    1. Chang, Fwu-Ranq, 2005. "On the elasticities of harvesting rules," Journal of Economic Dynamics and Control, Elsevier, vol. 29(3), pages 469-485, March.
    2. Willassen, Yngve, 1998. "The stochastic rotation problem: A generalization of Faustmann's formula to stochastic forest growth," Journal of Economic Dynamics and Control, Elsevier, vol. 22(4), pages 573-596, April.
    3. Reed, William J & Clarke, Harry R, 1990. "Harvest Decisions and Asset Valuation for Biological Resources Exhibiting Size-Dependent Stochastic Growth," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 31(1), pages 147-169, February.
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    1. Domínguez-May, Roger & Poot-López, Gaspar R. & Hernández, Juan & Gasca-Leyva, Eucario, 2020. "Dynamic optimal ration size in tilapia culture: Economic and environmental considerations," Ecological Modelling, Elsevier, vol. 420(C).

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