Index Catalog // ScholarsArchive@OSU

Creator:: Ekerhovd, Nils-Arne and Steinshamn, Stein Ivar
Abstract:: The Northeast Atlantic sustains a number of pelagic fish stocks, the most important of which are Norwegian Spring Spawning (NSS) herring, Northeast Atlantic blue whiting and Northeast Atlantic mackerel. The stocks are located in Russian, Norwegian, Icelandic, Faroese and EU waters, but the large scale distribution pattern varies and is...
Resource Type:: Presentation

Creator:: Steinshamn, Stein Ivar
Abstract:: A two-species bioeconomic model is analyzed, but in contrast to most similar models, there is no biological interaction between the species, only economic. The interaction takes place in the market where the quantity of either species may affect the price of the other. Both the sole-owner and the open access...
Resource Type:: Presentation

Creator:: Ekerhovd, Nils-Arne and Steinshamn, Stein Ivar
Abstract:: Optimal management of herring, mackerel, and blue whiting in the North East Atlantic is analyzed. The main motivation is to quantify the potential gain from implementing multi-species management compared to traditional single-species management. The objective is to maximize discounted net revenue; in other words a sole-owner perspective. The results are...
Resource Type:: Presentation

Creator:: Poudel, Diwakar and Steinshamn, Stein Ivar
Abstract:: This study investigates optimal catch of Barents Sea stocks, namely Northeast Arctic Cod and Capelin in multispecies ecosystem. We solve a multispecies age structured bioeconomic model for predator-prey interaction. Barents Sea stock data from ICES are employed for model application. Among others, we also include sustainability constraint in the model...
Resource Type:: Presentation

Creator:: Hannesson, Rognvaldur and Steinshamn, Stein Ivar
Abstract:: Present resource rents in Norway's fisheries were compared for different fleet structures. Alternative values of TACs were assumed, which is consistent with how most fisheries in Norwegian waters are managed. Total allowable catches (TACs) are set on the basis of advice by fisheries biologists where the economics of the industry...
Resource Type:: Research Paper

Creator:: Steinshamn, Stein Ivar
Abstract:: A generalization of the harvesting functions and the stock updating functions in age-structured bioeconomic models is outlined. Using this generalization everything from completely uniformly distributed fish to extreme schooling is taken care of. The classical Beverton-Holt model comes out as a special case of the generalized model. Both the theoretical...
Resource Type:: Research Paper

Creator:: Zimmermann, Fabian, Heino, Mikko, and Steinshamn, Stein Ivar
Abstract:: The individual size of fish as a proxy for life-history traits and market value displays an important, yet in bioeconomic modelling often ignored biological and economic parameter. This raises the question if and to what extent the consideration of a pricing related to the individual size influences optimal harvest strategies....
Resource Type:: Other

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