That was Central South Island Fish and Game Council officer Graeme Hughes' reaction to didymo being washed out of the Waitaki River.
Last week, Meridian Energy Ltd released a 48-hour flushing flow of 950 cumecs down the river, almost three times its average flow.
The release was to reduce the levels of the over-full storage lakes of Pukaki and Tekapo.
The flushing flow was aimed at washing the didymo infestation out to sea, as well as reopening the river mouth in its usual position instead of about 3.5km north, where it had shifted over the past three years.
Mr Hughes, in a jet-boat, checked the river between Kurow and Otekaieke earlier this week.
He said it was "clean as a whistle".
The heavy infestation of didymo had been cleared. The shingle bottom and fish could be seen again. That boded well for the salmon fishing season, as well as trout fishing.
Didymo tangles into hooks, frustrating anglers who were constantly clearing lures.
"The only grizzle I've heard is about the new mouth offering limited space for a large number of [salmon] anglers," he said.
Mr Hughes was not sure how long it would take didymo to invade the river again, but he suspected signs of didymo would return in three to four weeks.
But the river may not return to its previous heavy infestation for three months or more, and by then the fishing season would have ended.
His message was to make the most of the opportunity while it lasted.
