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Detecting the presence of depensation in collapsed fisheries: The case of the Northern cod stock

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  • Maroto, Jose M.
  • Moran, Manuel

Abstract

Motivated by the evidence that many collapsed stocks have failed to recover despite the fact that fishing mortality has been reduced, or even when a moratorium is in effect, we develop a methodological approach using splines to analyze the stochastic population dynamics of fish stocks at low stock levels. Considering the aggregate Northern cod stock by way of illustration, we find that the species’ lack of recovery, despite the moratorium which still remains in force, is consistent with the hypothesis of depensatory population dynamics at low population sizes, as opposed to the compensation estimated by the conventional regression methods used in classic bioeconomic models.

Suggested Citation

  • Maroto, Jose M. & Moran, Manuel, 2014. "Detecting the presence of depensation in collapsed fisheries: The case of the Northern cod stock," Ecological Economics, Elsevier, vol. 97(C), pages 101-109.
    • Handle: RePEc:eee:ecolec:v:97:y:2014:i:c:p:101-109
    DOI: 10.1016/j.ecolecon.2013.11.006
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    References listed on IDEAS

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    1. R. Quentin Grafton & Leif K. Sandal & Stein Ivar Steinshamn, 2000. "How to Improve the Management of Renewable Resources: The Case of Canada's Northern Cod Fishery," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 82(3), pages 570-580.
    2. R. Quentin Grafton & Tom Kompas & Pham Van Ha, 2009. "Cod Today and None Tomorrow: The Economic Value of a Marine Reserve," Land Economics, University of Wisconsin Press, vol. 85(3), pages 454-469.
    3. Ruppert,David & Wand,M. P. & Carroll,R. J., 2003. "Semiparametric Regression," Cambridge Books, Cambridge University Press, number 9780521785167, January.
    4. Reed, William J., 1979. "Optimal escapement levels in stochastic and deterministic harvesting models," Journal of Environmental Economics and Management, Elsevier, vol. 6(4), pages 350-363, December.
    5. Christian N. K. Anderson & Chih-hao Hsieh & Stuart A. Sandin & Roger Hewitt & Anne Hollowed & John Beddington & Robert M. May & George Sugihara, 2008. "Why fishing magnifies fluctuations in fish abundance," Nature, Nature, vol. 452(7189), pages 835-839, April.
    6. Sterner, Thomas, 2007. "Unobserved diversity, depletion and irreversibility The importance of subpopulations for management of cod stocks," Ecological Economics, Elsevier, vol. 61(2-3), pages 566-574, March.
    7. Esben M. Olsen & Mikko Heino & George R. Lilly & M. Joanne Morgan & John Brattey & Bruno Ernande & Ulf Dieckmann, 2004. "Maturation trends indicative of rapid evolution preceded the collapse of northern cod," Nature, Nature, vol. 428(6986), pages 932-935, April.
    8. Ruppert,David & Wand,M. P. & Carroll,R. J., 2003. "Semiparametric Regression," Cambridge Books, Cambridge University Press, number 9780521780506, January.
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    Cited by:

    1. Renato Rosa & João Vaz & Rui Mota & Alexandra Silva, 2018. "Preference for Landings’ Smoothing and Risk of Collapse in Optimal Fishery Policies: The Ibero-Atlantic Sardine Fishery," Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 71(4), pages 875-895, December.
    2. Cuenda, Sara & Llorente, Marta & Capitán, José A., 2020. "Collapse and recovery times in non-linear harvesting with demographic stochasticity," Applied Mathematics and Computation, Elsevier, vol. 380(C).

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