1Salmon and Fresh water Fisheries Research Institute, Hokkaido Research Organization, Eniwa, Hokkaido 061-1433, 2Mariculture Fisheries Research Institute, Hokkaido Research Organization, Muroran, Hokkaido 051-0013, Japan, 3Inland Aquaculture Research Center, National Fisheries Research and Development Institute, Changwon, Kyeongsangnam-do 645-806, Republic of Korea, 4Faculty of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido 041-8611, Japan
To investigate the distribution of ice fish Salangichthys microdon eggs, lines for survey at 11 locations were set on the shore of Lake Abashiri. Sediment s were collected by water depth on each of the survey lines to analyze the grain size and density of icefish eggs. Icefish eggs were distributed on sediment comprised of sand and gravel, and the egg density tended to be higher in the large grain size rather than the fine sand. However, there was a survey point where there were no eggs even though the sediment was medium sand. This suggests that factors such as water temperature and lake water level affect the egg distribution in addition to the sediment. There were few icefish eggs on the sediment where silt clay was predominant.