Skip to main content
[Translate to English:]
[Translate to English:]
Institute of

OF Baltic Sea Fisheries

Project

marEEchange - Marine ecological-economic systems in global change: responsibility for regime change and sustainability



Recreational fishing boat
© Udo Wagner
Recreational fishing boats on the Baltic Sea

Marine ecological-economic systems in global change: responsibility for regime change and sustainability

The stocks of cod and herring in the western Baltic Sea have collapsed. At the same time, cod and herring are important target fish species for commercial and angling fisheries. The BMBF-funded project aims to observe the change in the socio-ecological system of the western Baltic Sea in real time following the collapse of the cod stock in order to develop pathways for sustainability.

Background and Objective

Next to commercial fishing, recreational fishing, especially angling, plays an important role in the removal of biomass from fish stocks. The mixed commercial and recreational cod fishery in the western Baltic Sea is one such example. At the same time, the Baltic Sea is subject to constant change. Ongoing eutrophication and rapidly changing environmental conditions due to climate change have led to the collapse of important fish stocks such as the western cod stock or the spring-spawning herring of the western Baltic Sea (ecological tipping point). This has led to a cascade of social, economic and institutional responses without adequate consideration in management decisions. The impact on the marine recreational fishing sector, coastal fisheries and coastal communities is largely unknown, but transformation is inevitable. Signs of this already include the breakdown of important structures such as fishing associations and fishing cooperatives in commercial fisheries and the further decline of charter boats in recreational fisheries. In order to counteract the weakening of rural areas and to develop options for the future of recreational and coastal fishing targeted studies and measures are needed.
The aim of the Thünen-OF marEEchange subproject is to transform a resource management system (mixed commercial and recreational fisheries) into a socially and economically sustainable system that utilizes the resources of the Baltic Sea in an ecologically sustainable way. Such an approach requires a high degree of stakeholder understanding, such as the perception of stakeholders regarding the occurrence of an ecological tipping point in the western Baltic Sea, the causal responsibilities for the identified tipping points and the investigation of management measures introduced in response to the tipping points. Other intermediate objectives are the identification of short-term changes (recreational and commercial fisheries, ecosystem) to inform stakeholders and identify pathways for transition and the identification of non-provisional ecosystem services of the Baltic Sea, e.g. cultural identity, wellbeing, etc.

Approach

In marEEchange, we will use the extensive information from the series of marEEshift stakeholder workshops (2019-2020) to analyze how stakeholders assign causal responsibility for tipping points. In particular, we will use the mental models of the western Baltic cod stock and the answers to questions on possible causes for the previous decline of the cod stock in 2015 (both questionnaires and audio recordings of the workshop discussions).
We examine the re-organization of the marine recreational fisheries sector after the regime change in terms of (a) the complete abandonment of the fishery, (b) the switch to other fishing grounds, (c) the adjustment of fishing effort, (e) the change in catch and catch-and-release rates, and (e) the change in target species. This also includes the question of what effects this will have on fishing tourism on the Baltic Sea coast. The benchmark is obtained from the available past (2014/15) and current (2021/22) nationwide representative surveys. To monitor the restructuring, we are proposing a new angler survey. In addition, TI employees have been conducting continuous on-site surveys of anglers in the Baltic Sea since 2002, which are to be continued in subsequent years. As part of these surveys, more social science data will be collected and evaluated to determine the importance of angling for health and social wellbeing as well as changes in the composition of anglers and angling behavior. In addition, anglers' pro-environmental attitudes will be assessed using a modified New Ecological Paradigm (NEP) scale and anglers' knowledge of the effects of climate change on fish communities. This data will be used to investigate anglers' understanding of sustainable fisheries management and to improve understanding and communication between angling and conservation stakeholders.
As part of the sustainability transformation of recreational fishing, we address the non-consumptive motives for angling, such as recreation, nature experience and health, which are often more important to anglers than catching fish. In Detail, we will look at human-nature relationships (relational values) of recreational anglers to identify pathways for sustainability transformation in recreational fisheries. In order to cover the entire western Baltic Sea, and as we expect considerable differences between countries, these questions will be investigated by means of an online survey in Germany, Sweden, Denmark and Poland. Since fish are released on a large scale when fishing without removal, anglers are also asked about their attitude towards catch & release fishing and their level of knowledge about release practices of fish and animal welfare treatment of fish.
The importance of local coastal fishing for local identity, sense of place and coastal tourism will be investigated through media analysis (local and national print media; social media).

Involved external Thünen-Partners

  • Leibniz-Institut für Gewässerökologie und Binnenfischerei (IGB)
    (Berlin, Deutschland)
  • Humboldt-Universität zu Berlin
    (Berlin, Deutschland)
  • Albert-Ludwig Universität Freiburg
    (Freiburg, Deutschland)
  • Deutsches Zentrum für integrative Biodiversitätsforschung (iDiv), Halle-Jena-Leipzig
    (Leipzig, Deutschland)
  • Universität Hamburg
    (Hamburg, Deutschland)

Funding Body

  • Federal Ministry of Education and Research (BMBF)
    (national, öffentlich)

Duration

11.2023 - 10.2025

More Information

Project status: ongoing

Scroll to top