1National Research Institute of Fisheries Science, Fisheries Research Agency, Nikko, Tochigi 321-1661, 2Tochigi Prefectural Fisheries Experiment Station, Ohtawara, Tochigi 324-0404, Japan
We stocked eyed eggs of the white-spotted charr Salvelinus leucomaenis in fish-uninhabited reaches of the Kirizushisawa Stream of Kinu River, Tone River System, central Japan in January 2005 and 2006 using the Vibert box technique and surveyed the incubation rate, survival rate, growth, density and standing stock of the underyearling charr from the eyed eggs between August and November. In each year, the incubation rates were 93.2 and 99.0% and survival rates from eyed egg to November were 5.6 and 3.6%. The average standard length and body weight were 57.4 mm, 3.8 g and 60.3 mm, 3.8 g, and density and standing stock per 1 m2 water surface were 0.67 fish, 2.6 g and 0.48 fish, 1.8 g in November for each year, respectively. The number of eggs/fish decreased exponentially from January to November in both years.