Young char emerge from the gravel in spring .
Young char stay in the river from 5 to 7 months or until they are about 6 -- 8 in ( 15 -- 20 cm ) in length .
Young char emerge from the gravel in spring and stay in the river from 5 to 7 months or until they are about 6 -- 8 in ( 15 -- 20 cm ) in length .