Quote Originally Posted by garguy View Post
Nimrod et al.,

While you didn't ask the question of what caused this, I am putting it out there as you already answered it in another post. Excessive nutrients from nearby fertilizer applications or failing septic systems.

To provide more clarification on Matt's comment, blue-green algae is native to Arkansas waters, but in rather small percentages. It is only when conditions are exacerbated from excessive nutrients, low flows, high temperatures, etc. that a bloom occurs. Further, 'real high' concentrations is very misleading Matt. A blue-green bloom, even at low concentrations, still produce microcystin ( a toxin) that can result in skin irritation or fish kills. These blooms are classified as HABs or Harmful Algal Blooms and are relatively rare in Arkansas, but I would expect for these to start becoming more of an issue in the coming years/decade.
You are correct. What I should have said is that it normally doesn't cause a fish kill unless it is in high concentrations. This is not to say that it isn't having some sub-lethal effects on fish. I have seen blue-green algae on several lakes and ponds. The only time that I have seen it kill fish is in high concentrations. Thank you for the detailed explanation.