Composition and dynamics of fish stocks in the Gulf of Riga ecosystem

Introduction 2. The environment of the Gulf of Riga and the location of the research area 3. Origin and evolution of the organisms inhabiting the Baltic Sea 3.1.General 3.2.Origin and distribution of the organisms 3.3.Some adaptational considerations 3.4.Continued immigration to the Baltic and its implication for ecosystem dynamics 4. Productivity zones in the Gulf of Riga 4.1.General 4.2.Permanent hydrological fronts 4.3.Seasonal thermocline 5. Estimation of fish stock dynamics and the factors responsible for stock fluctuations 5.1.General 5.2.Description of the method proposed .. 5.3.Advantages and weakness of the method 5.4.Dynamics of fish stocks and the factors responsible 5.4.1.Dynamics of fish stocks 5.4.2.The factors affecting changes in fish stocks References Kalastiku koosseis ning kalavarude dünaamika Lii vi lahe ökosüsteemis.