@article{oai:repository.dl.itc.u-tokyo.ac.jp:00040738,
 author = {OJIMA, Daisuke and HARADA, Masafumi and IWATA, Munehico},
 issue = {1},
 journal = {Coastal marine science},
 month = {Jun},
 note = {application/pdf},
 pages = {40--46},
 title = {Darkness represses the onset of downstream migration in hatcheryreleased chum salmon, Oncorhynchus keta, fry},
 volume = {31},
 year = {2007}
}