Iowa DNR
Fish Kill DatabaseDB

Fish Kill Event - Silver Lake

Northwood

Event ID
946
Date of Kill
7/22/2017
Waterbody Type
Lake
Cause Origin
Natural
Cause
Cyanobacteria Bloom
Mode
N/A
Magnitude
4 (5001 - 10,000 fish killed)
County
Worth
ESD Field Office
FO 2
Fisheries Office
Clear Lake Station
LongDD
-93.41728
LatDD
43.48160
Created Date
3/6/2019 3:02:36 PM
Last Update
3/6/2019 3:02:36 PM
For more information about this fish kill event, contact the Field Office or Fisheries Office listed above.
Impacted Assessment Segments
Lat/Long uses WGS84 datum
Onsite Comments

A heavy blue-green algae bloom lead to a diurnal oxygen sag on the weekend of July 22-23. Dead fish were reported to Conservation Officers on July 23rd . Due to the nature of the kill and spatial distribution of fish, no exact counts of fish loss were made. It is estimated that around 10,000 fish were killed. Most of these were small bluegill and largemouth bass. Small yellow perch were also killed, but in much fewer numbers than the bluegill and bass.