Browsing Discussion papers (FOR) by Author "Ni, Yuanming"
Now showing items 1-4 of 4
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Greed is good: from super-harvest to recovery in a stochastic predator-prey system
Ni, Yuanming; Sandal, Leif K.; Kvamsdal, Sturla F.; Poudel, Diwakar (Discussion paper;5/19, Working paper, 2019-09-04)This paper demonstrates a predator-prey system of cod and capelin that confronts a possible scenario of prey extinction under the first-best policy in a stochastic world. We discover a novel ‘super-harvest’ phenomenon that ... -
Optimal fishing mortalities with age-structured bioeconomic model - a case of NEA mackerel
Ni, Yuanming; Steinshamn, Stein I. (Discussion paper;9/16, Working paper, 2016-05-31)The effects of random environmental impacts on optimal exploitation of a fish population are investigated using both optimization and simulation, based on a discrete-time age-structured bioeconomic model. The optimization ... -
Optimization of age-structured bioeconomic model: recruitment, weight gain and environmental effects
Ni, Yuanming (Discussion paper;4/19, Working paper, 2019-09-03)More and more fishery researchers begin to acknowledge that one-dimensional biomass models may omit key information when generating management guidelines. For the more complicated age-structured models, numerous parameters ... -
Seasonality matters: a multi-season, multi-state dynamic optimization in fishery
Ni, Yuanming; Sandal, Leif K. (Discussion paper;2/18, Working paper, 2018-02-12)Many biological and economic processes in fishery happen seasonally. Most of the extant literature tends to neglect this fact. This work is an initial attempt to treat seasonality in a systematic and proper way. We apply ...