Optimal multispecies fishery management in the Baltic Sea: A bioeconomic analysis

The aim of the thesis is to assess the fishery of Baltic cod, herring and sprat by simulation over 50 years time period. We form a bioeconomic multispecies model for the species. We include species interactions into the model because especially cod and sprat stocks have significant effects on each other. We model the development of population dynamics, catches and profits of the fishery with current fishing mortalities, as well as with the optimal profit maximizing fishing mortalities. Thus, we see how the fishery would develop with current mortalities, and how the fishery should be developed in order to yield maximal profits. Especially cod stock has been quite low recently and by optimizing the fishing mortality it could get recovered. In addition, we assess what would happen to the fisheries of the species if more favourable environmental conditions for cod recruitment dominate in the Baltic Sea. The results may yield new information for the fisheries management. According to the results the fishery of Baltic cod, herring and sprat are not at the most profitable level. The fishing mortalities of each species should be lower in order to maximize the profits. By fishing mortality optimizing the net present value would be almost three times higher in the simulation period. The lower fishing mortality of cod would result in a cod stock recovery. If the environmental conditions in the Baltic Sea improved, cod stock would recover even without a decrease in the fishing mortality. Then the increased cod stock would restrict herring and sprat stock remarkably, and harvesting of these species would not be as profitable anymore.

Suomalaisten kalastus.

Mode of access: Internet.

Environmental factors and uncertainty in fisheries management in the northern Baltic Sea

The Baltic Sea is a geologically young, large brackish water basin, and few of the species living there have fully adapted to its special conditions. Many of the species live on the edge of their distribution range in terms of one or more environmental variables such as salinity or temperature. Environmental fluctuations are know to cause fluctuations in populations abundance, and this effect is especially strong near the edges of the distribution range, where even small changes in an environmental variable can be critical to the success of a species. This thesis examines which environmental factors are the most important in relation to the success of various commercially exploited fish species in the northern Baltic Sea. It also examines the uncertainties related to fish stocks current and potential status as well as to their relationship with their environment. The aim is to quantify the uncertainties related to fisheries and environmental management, to find potential management strategies that can be used to reduce uncertainty in management results and to develop methodology related to uncertainty estimation in natural resources management. Bayesian statistical methods are utilized due to their ability to treat uncertainty explicitly in all parts of the statistical model. The results show that uncertainty about important parameters of even the most intensively studied fish species such as salmon (Salmo salar L.) and Baltic herring (Clupea harengus membras L.) is large. On the other hand, management approaches that reduce uncertainty can be found. These include utilising information about ecological similarity of fish stocks and species, and using management variables that are directly related to stock parameters that can be measured easily and without extrapolations or assumptions.

Survival in the Rainforest : Change and Resilience among the Punan Vuhang of Eastern Sarawak, Malaysia

This dissertation concerns the Punan Vuhang, former hunter-gatherers who are now part-time farmers living in an area of remote rainforest in the Malaysian state of Sarawak. It covers two themes: first, examining their methods of securing a livelihood in the rainforest, and second looking at their adaptation to a settled life and agriculture, and their response to rapid and large-scale commercial logging. This study engages the long-running debates among anthropologists and ecologists on whether recent hunting-gathering societies were able to survive in the tropical rainforest without dependence on farming societies for food resources. In the search for evidence, the study poses three questions: What food resources were available to rainforest hunter-gatherers? How did they hunt and gather these foods? How did they cope with periodic food shortages? In fashioning a life in the rainforest, the Punan Vuhang survived resource scarcity by developing adaptive strategies through intensive use of their knowledge of the forest and its resources. They also adopted social practices such as sharing and reciprocity, and resource tenure to sustain themselves without recourse to external sources of food. In the 1960s, the Punan Vuhang settled down in response to external influences arising in part from the Indonesian-Malaysian Confrontation. This, in turn, initiated a series of processes with political, economic and religious implications. However, elements of the traditional economy have remained resilient as the people continue to hunt, fish and gather, and are able to farm on an individual basis, unlike neighboring shifting cultivators who need to cooperate with each other. At the beginning of the 21st century, the Punan Vuhang face a new challenge arising from the issue of rights in the context of the state and national law and large-scale commercial logging in their forest habitat. The future seems bleak as they face the social problems of alcoholism, declining leadership, and dependence on cash income and commodities from the market.

Vesien virkistyskäyttö osana vapaa-ajan viettoa Lohjan seudulla

Engl. summary: Recreational use of waters as a form of leisure activity in the Lohja region

Water Management in Cambodia Resources and Relations

In Cambodia, water has a special purpose as a source of life and livelihoods. Along with agriculture, fishing and forest use, industry, hydropower, navigation and tourism compete for the water resources. When rights and responsibilities related to essential and movable water are unclear, conflicts emerge easily. Therefore, water management is needed in order to plan and control the use of water resources. The international context is characterized by the Mekong River that flows through six countries. All of the countries by the river have very different roles and interests already depending on their geographical location. At the same time, water is also a tool for cooperation and peace. Locally, the water resources and related livelihoods create base for well-being, for economical and human resources in particular. They in turn are essential for the local people to participate and defend their rights to water use. They also help to construct the resource base of the state administration. Cambodia is highly dependent on the Mekong River. However, Cambodia has a volatile history whose effects can be seen for example in population structure, once suspended public institutions and weakened trust in the society. Relatively stable conditions came to the country as late as in the 1990s, therefore Cambodia for example has a weak status within the Mekong countries. This Master s thesis forms international, national and local interest groups of water use and analyzes their power relations and resources to affect water management. The state is seen as the salient actor as it has the formal responsibility of the water resources and of the coordination between the actions of different levels. In terms of water use this study focuses on production, in management on planning and in power relations on the resources. Water resources of Cambodia are seen consisting of the Mekong River and Tonle Sap Lake and the time span of the study is between the years 1991 and 2006. The material consists of semi-structured interviews collected during summer 2006 in Finland and in Cambodia as well as of literature and earlier studies. The results of the study show that the central state has difficulties to coordinate the actions of different actors because of its resource deficit and internal conflicts. The lessons of history and the vested interests of the actors of the state make it difficult to plan and to strengthen legislation. It seems that the most needed resources at the central state level are intangible as at the village level instead, the tangible resources (fulfilling the basic needs) are primarily important. The local decision-making bodies, NGOs and private sector mainly require legislation and legitimacy to support their role. However, the civil society and the international supporters are active and there are possibilities for new cooperation networks. Keywords: Water management, resources, participation, Cambodia, Mekong

Kansainvälisen rajat ylittävän yhteistyön teemat sekä yhteistyötä tukevat toimenpiteet merialuesuunnittelussa – esimerkkialueina eteläinen ja keskinen Itämeri.

Merialuesuunnittelun avulla pyritään ennaltaehkäisemään merellä syntyviä konflikteja, jotka voivat tapahtua ympäristön ja eri toimintojen välillä. Merialuesuunnittelu on usealle Itämeren valtiolle melko uusi asia, mikä vaikuttaa kansainväliseen rajat ylittävään yhteistyöhön merialuesuunnittelussa. Valtioiden taustat sekä heidän tapansa järjestää merialuesuunnittelu osaksi kansallista toimintaa vaihtelee. Vuoden 2014 kesällä Euroopan parlamentti ja neuvosto julkaisi direktiivin, jonka mukaan rannikkoalueita omaavien valtioiden tulee toteuttaa merialuesuunnittelua ja laatia virallinen merialuesuunnitelma vuoteen 2021 mennessä. Direktiivissä mainitaan yhteistyö muiden valtioiden kanssa osana merialuesuunnittelua. Kansainvälistä rajat ylittävää yhteistyötä on toteutettu aiemmin useissa eri hankkeissa, myös merialuesuunnittelun hankkeissa. Tässä tutkimuksessa tarkastellaan mitkä toimenpiteet tukevat kansainvälistä rajat ylittävää yhteistyötä merialuesuunnittelussa sekä mitkä ovat keskeisimmät merialuesuunnittelun teemat merialuesuunnittelussa Itämeren alueella. Tutkimuksen esimerkkialueina ovat eteläinen ja keskinen Itämeri. Tutkimusmenetelminä toimivat Itämeren alueen merialuesuunnittelukokousten havainnoinnit, ryhmä- ja yksilöhaastattelu sekä avointen paikkatietoaineistojen visualisointi. Keskeiset teemat, joista keskusteltiin paljon, olivat merenkulku sekä energiantuotanto. Teemojen valintaan vaikutti eri valtioiden intressit sekä säädökset, jotka ohjaavat merialuesuunnittelua. Teemojen sisäisten osa-alueiden painotus vaihteli eteläisellä ja keskisellä Itämerellä. Kukin teema sisältää useita eri osa-alueita, kuten kalastus sisältää kalojen elinalueet sekä kalastusalueet. Rajat ylittävää yhteistyötä tukevia toimenpiteitä koettiin olevan kommunikointi, yhteistyökehikon selkeys sekä yhteistyöhön sitoutuminen.