FEEDING OF ATLANTIC SALMON (SALMO-SALAR L) POSTSMOLTS IN A FJORD IN CENTRAL NORWAY

The feeding habits of postsmolt Atlantic salmon (Salmo salar) caught b y two-boat trawling were studied in Trondheimsfjord in central Norway. Fish caught in the inner fjord near the estuaries of the Orkla and Ga ula rivers had recently fed on food produced in freshwater and estuari ne habitats, namely stonefly and mayfly nymphs and gammarid amphipods. Stomach contents of postsmolts caught farther seaward were dominated by adult insects, with smaller proportions of the food volume originat ing from marine pelagic (larval fish, hyperiid amphipods, calanoid cop epods) and nearshore (gammarid amphipods) habitats.