Now showing items 1-10 of 13
A bioeconomic MPA study based on cellular automata population growth and distribution
(Journal article; Tidsskriftartikkel; Peer reviewed, 2011)
This paper investigates possible biological and economic effects of using marine sanctuaries as a management tool, employing cellular automata techniques to model biological growth and area distribution, assuming open access to the fish stock resources outside the protected area. The cellular automata model incorporates a fish harvest model based on standard assumptions. In agreement with previous ...
Economic Impacts of Global Warming : The Case of the Barents Sea Fisheries
(Journal article; Tidsskriftartikkel; Peer reviewed, 2007)
Regional analyses of possible physical and biological effects of global warming in the Barents Sea area have been carried out recently. Based on such studies possible economic impacts of global warming on the Barents Sea fisheries have been quantified, assuming different types of management regimes. The EconSimp2000 model, consisting of the ecosystem model AggMult and the fleet model EconMult have ...
Optimal Selection and Effort in a Fishery on a Stock with Cannibalistic Behaviour : The Case of the Northeast Arctic Cod Fisheries
(Journal article; Tidsskriftartikkel; Peer reviewed, 2010)
We explore a fishery targeting the mature part of a stock, while bycatching the immature part. Both targeted catch and bycatch may have positive market values. Cost of effort is supposed to be a function of the selection properties of the fishing gears. Mature fish is assumed to cannibalise on the immature part of the stock. A bioeconomic model of the problem is set up and it is shown that the model ...
Fisheries Management and Global Warming. Effects of climate change on fisheries in the Arctic region of the Nordic countries.
(Research report; Forskningsrapport, 2014)
Rebuilding the Northeast Arctic Cod Fisheries - Economic and Social Issues
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014)
The Northeast Arctic cod (NEA cod) fisheries in Norway are now one of the richest cod fisheries in the world. In the past the fishery has experienced several stock declines and low economic returns. In this paper we review management approaches applied over 20 years to address one of the most severe crises in the fishery. Emphasis is on management strategies and the measures carried out to ensure ...
Harvest control rules in modern fisheries management
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-07-20)
Harvest control rules have become an important tool in modern fisheries management, and are increasingly adopted to provide continuity in management practices, to deal with uncertainty and ecosystem considerations, and to relieve management decisions from short-term political pressure. We provide the conceptual and institutional background for harvest control rules, a discussion of the structure of ...
Causes and consequences of fleet diversity in fisheries: The case of the Norwegian Barents Sea cod fishery
(Journal article; Tidsskriftartikkel; Peer reviewed, 2016-05-25)
Fisheries operate under fluctuating environmental conditions, targeting fish stocks that appear in varying densities in different areas, often with abrupt and unexpected local changes. Physical conditions, markets and management regulations constrain vessels in different and varying ways. These factors all contribute to forming the fleet diversity we find in most fisheries. Here, a simulation model ...
Seafood from a changing Arctic
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-10-27)
We review current knowledge about climate change impacts on Arctic seafood production. Large-scale changes in the Arctic marine food web can be expected for the next 40–100 years. Possible future trajectories under climate change for Arctic capture fisheries anticipate the movement of aquatic species into new waters and changed the dynamics of existing species. Negative consequences are ...
Climate change, fisheries management and fishing aptitude affecting spatial and temporal distributions of the Barents Sea cod fishery
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-10-26)
Climate change is expected to influence spatial and temporal distributions of fish stocks. The aim of this paper is to compare climate change impact on a fishery with other factors impacting the performance of fishing fleets. The fishery in question is the Northeast Arctic cod fishery, a well-documented fishery where data on spatial and temporal distributions are available. A cellular automata ...
Substituting model based indicators in Harvest Control Rules by observations using fuzzy logic methodology
(Journal article; Tidsskriftartikkel; Peer reviewed, 2017-12-26)
Harvest Control Rules are predefined heuristic decision rules to provide quota advices for managed fisheries. Frequently statistical methods and biological assumptions expressed in mathematical models, are used to provide the Harvest Control Rules with initial information (indicators values). The aim of this article is to investigate a possible way forward of replacing these inputs by quantities of ...