Food of anadromous form of Salvelinus alpinus (L.,1758) in Lake Svartvatnet and in the mouth of River Revelva (Vest Spitsbergen - Hornsund area)

Abstract

Food of the Arctic charr was studied using frequency of various diet items and their contribution to total food weight. Food of the adult Arctic charr in Lake Svartvatnet consisted mostly of larval, pupal and imaginal dipterans. The juvenile Arctic charr, measuring 9-13 cm, were an important food item as well and made up more than half of the entire food weight. The fish in the mouth of River Revelva fed mostly and most frequently on amphipod. The second most important food item in the area were cottid fishes, mainly small (up to 2.5 cm long) individuals of the Myoxocephalus species.