inlet, or pond edges (though crowding at the surface during specific times of day, such as early morning, is more likely a sign of low oxygen)
#Abnormal activity such as flashing, twisting, whirling, convulsions, loss of buoyancy
#Listlessness, weakness, sluggishness, lack of activity
#Loss of appetite or refusal to feed.

Toxins

Agricultural runoff, sewage, surface runoff, chemical spills

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