CHESTERVILLE — If you’ve smelled something fishy in the Parker Pond area for more than a week, it was 13,000 rotten white perch left on an uninhabited island by state biologists.

The invasive species was put in the cold-water pond illegally in 1990s, competing with salmon and trout.

Biologists removed the perch last week and left them on the island, Mark Latti, spokesman for the Department of Inland Fisheries and Wildlife, said.

The fish should not have been put there, he said.

They were cleaned up Wednesday and taken to a compost facility at a regional office, he said.

The smell drove at least one family to cut short an outing June 19.

Parker Pond lies mostly in Chesterville, with a small area in Vienna.