Zeynep Pekcan-Hekim,^* Lauri Urho,^** Heikki Auvinen,^*** Outi Heikinheimo,^**** Jyrki Lappalainen,^***** Jari Raitaniemi,^****** Pirkko Söderkultalahti<sup>*******


*</sup>Zeynep Pekcan-Hekim () is a researcher at the Finnish Game and Fisheries Research Institute. Her current interest focuses on environmental changes and its effects on fish, fisheries and aquatic ecosystems. Address: Finnish Game and Fisheries Research Institute, P.O. Box 2, 00791 Helsinki, Finland. Address: Department of Environmental Sciences, University of Helsinki, P.O. Box 65, 00014 University of Helsinki, Finland. e-mail: zeynep.pekcan-hekim@helsinki.fi
^**Lauri Urho is a researcher at the Finnish Game and Fisheries Research Institute. His main research focuses on environmental changes and its effects on fish reproduction, reproduction areas, and habitats. He is also involved in Finnish invasive species studies. Address: Finnish Game and Fisheries Research Institute, P.O. Box 2, 00791 Helsinki, Finland. e-mail: lauri.urho@rktl.fi
^***Heikki Auvinen is a researcher at the Finnish Game and Fisheries Research Institute. His interest focuses mainly on interactions of fish communities, evaluation of vendace, perch and pikeperch stocks. He is also involved in studies mapping juvenile fish. Address: Finnish Game and Fisheries Research Institute, Itäinen Pitkäkatu 3, 20520 Turku, Finland. e-mail: heikki.auvinen@rktl.fi
^****Outi Heikinheimo is a Senior Scientist at the Finnish Game and Fisheries Research Institute. Her main interests covers fisheries management research, effects of fishing on fish stocks, interactions in fish communities, predation, and modeling. Address: Finnish Game and Fisheries Research Institute, P.O. Box 2, 00791 Helsinki, Finland. e-mail: outi.heikinheimo@rktl.fi
^*****Jyrki Lappalainen is a researcher and lecturer at the Department of Environmental Sciences. His research interest focuses on environmental changes and its effects on fish, fisheries and aquatic ecosystems. Address: Department of Environmental Sciences, University of Helsinki, P.O. Box 65, 00014 University of Helsinki, Finland. e-mail: jyrki.t.lappalainen@helsinki.fi
^******Jari Raitaniemi is a Senior Scientist at the Finnish Game and Fisheries Research Institute. His interest focuses mainly on the assessment of economically important fishery resources and monitoring herring and coastal fish species. He is also involved in studies dealing with accuracy of fish age determinations. Address: Finnish Game and Fisheries Research Institute, Itäinen Pitkäkatu 3, 20520 Turku, Finland. e-mail: jari.raitaniemi@rktl.fi
^*******Pirkko Söderkultalahti is the fisheries statistician at the Finnish Game and Fisheries Research Institute. She is in charge of the statistics of the commercial fisheries in the sea area. Address: Finnish Game and Fisheries Research Institute, P.O. Box 2, 00791 Helsinki, Finland. e-mail: pirkko.soderkultalahti@rktl.fi