SEATTLE – Residents and county agents say they often find large amounts of dead fish this time of year and figure it’s a natural die-off. But some scientists aren’t so sure.
It started happening late last week and while county officials are investigating, officials did not comment to KING 5 News yet. At this point they don't seem sure why it's happening.
You have to get close to the water to see the sunken graveyard of hundreds of Lake Washington fish, their shiny bodies stacked up on the bottom. But you don't have to get close at all to know they are washing up on the shore.

Visitors to Juanita Beach will have to get used to stepping over decaying carcasses. Carcasses of the dead fish are strewn all over the beach. It’s not just little perch, but also big fish such as carp.
Even the birds cannot keep up with the mess.
County water experts and others say this is probably a natural event – low oxygen levels in the water due to high temperatures for several days.
But they are finding that oxygen levels are not all that low and it usually only affects small fish like perch.
So, what's this all about?
Captured in pictures from KING 5’s helicopter SkyKing were dozens of large, dead fish, apparently carp, in the middle of some discolored water on the north end of the lake, with even bigger live fish swimming nearby.
The area's famous birds – eagles and herons – watch and wait for their turn to move in.
Fish and wildlife agents are checking out the situation. At this point some suspect it may be more than the typical seasonal die-off, but could be caused by oxygen-robbing materials like yard fertilizer. More tests are needed and park users will have to get used to stepping over decaying carcasses.