The first introduction ofMysis relictain Lake Sakakawea, North Dakota, occurred in 1974, followed by a second stocking in 1979. No evidence of survival and reproduction was immediately apparent. In 1994, several mysids were collected during a ichthyoplankton study in the tailrace below Garrison Dam, which impounds Lake Sakakawea. Samples were collected biweekly during the summer of 1994. A total of 32 mysids were observed in 23 samples from mid-July through August.