Around October every year for the last 19 years, Unalaska High School students have been wading into the Iliuliuk River, under science teacher Steven Gregory's guidance, to collect pairs of spawning salmon . Last week, students in Gregory's fisheries class stretched a seine net from bank to bank, while another group waded upstream, rhythmically slapping large dip nets on the surface of the water. "Two people go down and they scare the fish into the net and then a bunch of people stand on the net