FYI

[snagged in outlet 3]

I really feel for Sugar britches....

[bfishn]

5 minutes ago, fishinwrench said:

Well if you have a meter then surely you have the data that shows how much % of oxygen each fish requires, otherwise what's the point of having a meter?  Can you share it, please ?

I can dig it up at home, but a basic ROT is 6 ppm for trout and 4 ppm for most other gamefish, but there is really more to it than DO alone. I'll dig up some data for you tonight.

[fishinwrench]

2 hours ago, snagged in outlet 3 said:

I really feel for Sugar britches....

That girl is on her toes 24/7, brother.  You ever wondered what makes it worth it?  😁

So you're telling me that water with less than 4ppm can happen because of a little rain shower, or some inflow from a ditch that is not heavily polluted with phosphorus or nitrogen?    And a fish that happens to swim into it, and can't escape it in less than 3 minutes, will perish ?

What's the required ppm for sunfish ?

[snagged in outlet 3]

34 minutes ago, fishinwrench said:

You ever wondered what makes it worth it?  😁

Nope, never.

I just did and it made me queasy. 

[snagged in outlet 3]

I was referring to what made it worth it to her to deal with you everyday.  

[fishinwrench]

1 hour ago, snagged in outlet 3 said:

I was referring to what made it worth it to her to deal with you everyday.  

Truth be known, she's probably the reason I'm such a jackass.  I'd be more cooperative with everybody, would be  proud of the MDC, wouldn't hate 4-strokes, wouldn't give biologists such a hard time, and I might even attend church if I didn't have to live in fear or HER.   😅

[MOPanfisher]

I just figured FW must be independently wealthy, had a terminal disease, and no prenuptial agreement.😆

[bfishn]

18 hours ago, bfishn said:

... I'll dig up some data for you tonight.

I borrowed the chart below from an aquarium site because it has a Fahrenheit temperature scale. Whoever made it mistakenly labeled the oxygen scale as %, it should be parts per million (ppm). Otherwise accurate.
 

As previously mentioned, DO levels are directly related to water temperature. Saturation is the most DO that water can contain under natural conditions at atmospheric pressure and the indicated temperature. I posted this to illustrate what a narrow range there can be between DO saturation and lethal limits. For instance, at 86 degrees, the maximum DO is ~7.6 ppm, just 3.6 parts per million above lethality for most fish. At 50-59 degrees (common thermocline temps), the spread doubles to ~6-7 ppm.

 
Considering the dynamic, ever-changing nature of DO, it’s pretty amazing that we have as few DO-related fish kills as we do. Surface aeration replenishes DO, Biological Oxygen Demand depletes it. Then you have the daily phytoplankton cycle that replenishes DO in the day and depletes it at night. Inflows can be beneficial or detrimental simply depending on the specific conditions at that particular time and place.

I’ll make no claims as to what I think a fish knows or thinks, or whether it’s smart enough to sense potentially lethal conditions and relocate accordingly. In the case of walleye that are conditioned to summer thermocline temperatures, I know it wouldn’t do them much good to leave that zone because DO was dropping and move the mere ~30’ to the surface where it’s better, because the sudden change from ~55 degrees to ~85 would croak them in a fairly short time. Maybe that’s what happened.

[snagged in outlet 3]

42 minutes ago, fishinwrench said:

Truth be known, she's probably the reason I'm such a jackass.  I'd be more cooperative with everybody, would be  proud of the MDC, wouldn't hate 4-strokes, wouldn't give biologists such a hard time, and I might even attend church if I didn't have to live in fear or HER.   😅

Chicken!

[fishinwrench]

1 hour ago, bfishn said:

I borrowed the chart below from an aquarium site because it has a Fahrenheit temperature scale. Whoever made this chart mistakenly labeled the oxygen scale as %, it should be parts per million (ppm). 
 

As previously mentioned, DO levels are directly related to water temperature. Saturation is the most DO water can contain under natural conditions at atmospheric pressure and the indicated temperature. I posted this to illustrate what a narrow range there can be between DO saturation and lethal limits. For instance, at 86 degrees, the maximum DO is ~7.6 ppm, just 3.6 parts per million above lethality for most fish. At 50-59 degrees (common thermocline temps), the spread doubles to ~6-7 ppm.

 
Considering the dynamic, ever-changing nature of DO, it’s pretty amazing that we have as few DO-related fish kills as we do. Surface aeration replenishes, Biological Oxygen Demand depletes. Then you have the daily phytoplankton cycle that replenishes in the day and depletes at night. Inflows can be beneficial or detrimental simply depending on the specific conditions at that particular time and place.

I’ll make no claims as to what I think a fish “knows” or thinks, or whether it’s smart enough to sense potentially lethal conditions and relocate accordingly. In the case of walleye that are conditioned to summer thermocline temperatures, I know it wouldn’t do them much good to leave that zone because DO was dropping and move the mere ~30’ to the surface layer where it’s better, because the sudden change from ~55 degrees to ~85 would croak them in a fairly short time. Maybe that’s what happened.

Good stuff.  Thanks