@article{oai:soar-ir.repo.nii.ac.jp:00002222, author = {北野, 聡 and 河合, 吉図 and 井田, 秀行}, journal = {信州大学教育学部附属志賀自然教育研究施設研究業績}, month = {Mar}, note = {Diet, growth and sexual maturity of introduced rainbow trout (Oncorhynchus mykiss) were studied in a headwater tributary of Zako stream, central Japan, where white-spotted char (Salvelinus leucomaenis) were indigenous. Sexually matured rainbow trout (22-26 cm TL and age 3 + ) were caught in mid-April. They fed primary on aquatic invertebrates, but fries of native char were also detected in the trout diet. Our results suggest that introduced rainbow trout may be crucial competitor and predator suppressing native char populations., Article, 信州大学教育学部附属志賀自然教育研究施設研究業績 40: 9-13(2003)}, pages = {9--13}, title = {雑魚川源流域におけるニジマスとイワナの生態的特徴}, volume = {40}, year = {2003} }