Nordic fisheries and aquaculture

Socio-economic importance of nitrogen nutrient load in the environment

image of Nordic fisheries and aquaculture

This report contributes to the understanding of how the the socio-economic contribution of Nordic fisheries/aquaculture are affected by the environment and environmental management, with focus on nitrogen. The report contains two case studies of how the socio-economic contribution of Danish/Swedish cod fishery in the Western Baltic Sea are affected by the nitrogen in the sea, and on how salmon growth rates in aquaculture in the Bokna Fiord are affected by nitrogen concentration. A Nordic workshop was held with the title: Fisheries, aquaculture and the marine environment: Environmental challenges and regulation, with focus on nitrogen. The finding of the case studies was presented at the workshop, together with presentations made by invited speakers on the role of nutrients and their management for Nordic fisheries/aquaculture. The discussion at the workshop is summarized in this report.



Case I: Fisheries management under nutrient influence: Cod fishery in the Western part of the Baltic Sea

The purpose of this chapter is to identify economic optimal management of fisheries under the influence of nutrients, focusing on the Swedish and Danish cod fisheries with passive gears in the Western part of the Baltic Sea. The Western part of the Baltic Sea is chosen, since cod fishing is extensive in this area and since it forms part of a semi-closed marine environment that has been subject to discharges of nitrogen for many years. The chapter extends existing bio-economic models of fisheries to analyze not only the effect of fishing, but also the effect of nitrogen concentration on the West Baltic cod stock. This case study is performed by Max Nielsen, Ayoe Hoff, and Rasmus Nielsen, Institute of Food and Resource Economics, University of Copenhagen, Denmark, by Cecilia Hammarlund and Staffan Waldo, AgriFood Economics Centre, Swedish University of Agricultural Sciences and Lund University and by Valerio Bartolino, Department of Aquatic Resources, Swedish University of Agricultural Sciences.


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