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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.

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  • 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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    1. Ruppert,David & Wand,M. P. & Carroll,R. J., 2003. "Semiparametric Regression," Cambridge Books, Cambridge University Press, number 9780521785167, May.
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    7. Ruppert,David & Wand,M. P. & Carroll,R. J., 2003. "Semiparametric Regression," Cambridge Books, Cambridge University Press, number 9780521780506, May.
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    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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