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Low dissolved oxygen levels in Mann-Nyholt in Brighton leads to fish die-off

A recent algae bloom and high water temperatures at Mann-Nyholt Lake in Adams County (part of Adams County Fairground Lakes) have created low levels of dissolved oxygen in the water and caused numerous fish to die.

The event will impact aquatic life and fishing conditions in the immediate future.

CPW District Wildlife Manager Jerrie McKee said conditions were caused by several factors. High water temperatures, lower levels of running water feeding into the lake, and a recent algae bloom have all resulted in lower levels of dissolved oxygen available for aquatic life. Some species are more susceptible as dissolved oxygen levels fall and include minnows and gizzard shad, which is the majority of the die-off at this time.

Several agencies including Colorado Department of Public Health and Environment, Tri-County Health, and the local parks department have been notified of current conditions and may conduct additional monitoring and testing as they see necessary.
Member comments
by: captcat#1 on 9/19/2022 9:51:00 PM
this is very sad. i have fished this pond for 20 plus years. some of the best catfishing in colorado .i have caught many catfish over 20 lbs and 2 fish over 30 lbs all releasted. when the catfish were not biting it was great for large the last few years the catfish has been few and far between. this pond needs a areator like the back pond .
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