La distribución del ingreso en México

Abstract

? 2006 by Blackwell Publishing Ltd.The status of sea trout populations on the Finnish coast of the Gulf of Bothnia, the northernmost part of the Baltic Sea, was surveyed and assessed by electrofishing, recaptures of tagged fish and catch data. A great majority of the natural trout populations have died out and the remaining ones are endangered by the small size of the spawning populations. Supportive stocking has not strengthened natural reproduction. Trout have been fished during their feeding migration at a still younger age, most of them during the release year or in the following year, before they are sexually mature. The majority of small trout have been caught by gill nets with small mesh sizes used in coastal whitefish fishing. In order to enhance the natural trout populations and to rationalise the fishing, alternative procedures are presented for fisheries management in the sea and rivers as well as recommendations for improving the management of the trout stocks and their environment.