Jump to content
  • GUESTS

    If you want access to members only forums on HSO, you will gain access only when you Sign-in or Sign-Up .

    This box will disappear once you are signed in as a member. 😀

  • RECEIVE THE GIFTS MEMBERS SHARE WITH YOU HERE...THEN...CREATE SOMETHING TO ENCHANT OTHERS THAT YOU WANT TO SHARE

    You know what we all love...

    When you enchant people, you fill them with delight and yourself in return. Have Fun!!!

Sign in to follow this  
DarkLordoftheEyes

Oxygen Level, thermo cline during winter and walleyes

Recommended Posts

I recall reading a pro's tip about oxygen level, thermo cline and how it relates to walleyes during summer. Has any one seen an article relating this to winter? I am sure someone has and hope someone points me in the right direction. Thanks

Share this post


Link to post
Share on other sites

I don't believe there is a thermocline in the winter. That's why walleyes can sometimes be caught at depths in the winter that they can not use in the summer. Oxygen can actually become depleted in the shallower water first due to decay of organic matter and use by oxygen breathing critters.

Share this post


Link to post
Share on other sites

Quote:

I don't believe there is a thermocline in the winter.


Pathogen is correct. There is no thermocline in the winter under the ice.

Share this post


Link to post
Share on other sites

In the winter the formal term is "Inverse Thermal Stratification". This means that the water just below the ice is at 32 degrees F or 0 degrees C. The water is warmer as you go deeper and at the bottom, the temperature is approximately 38 degrees F which is the maximum density of water. Sunlight through the ice, ground water intrusion(springs) or current can influence the stratification of water both in the summer and winter.

Share this post


Link to post
Share on other sites

Quote:

In the winter the formal term is "Inverse Thermal Stratification". This means that the water just below the ice is at 32 degrees F or 0 degrees C. The water is warmer as you go deeper and at the bottom, the temperature is approximately 38 degrees F which is the maximum density of water. Sunlight through the ice, ground water intrusion(springs) or current can influence the stratification of water both in the summer and winter.


Along with this, most of MN's lakes are dimictic, meaning they turn over twice (in the spring and in the fall.) During these turnover periods, water is mixed has equal temp. and oxygen levels. Once the thermocline does set it, water below it can change as much as 1 degree celcius for every meter. The deeper you go, the colder the temp. and the lower the oxygen level.

A good rule of thumb for where the thermocline sets up, but not always, is where 1% of the surface light is getting through.

I certainly am no expert on thermoclines but we just got done going through all this in my Ecology class. It's nice when we cover stuff that's actually interesting!

Share this post


Link to post
Share on other sites

Quote:

The deeper you go, the colder the temp. and the lower the oxygen level.


Question.

Cooler water can hold more gas than warmer water. So, why does the colder water near the bottom have less gas? Is it because it is father away from the surface?

Share this post


Link to post
Share on other sites

Quote:

Quote:

The deeper you go, the colder the temp. and the lower the oxygen level.


Question.

Cooler water can hold more gas than warmer water. So, why does the colder water near the bottom have less gas? Is it because it is father away from the surface?


One reason, as explained above, the most dense water at 39 F, at the bottom, is the warmest in the water column. And, I don't think it necessarily has less "gas", just less oxygenated gas. In other words, the decay process on the bottom eats up oxygen and produces CO2; and anaerobic bacterial processes produce Sulphur Dioxide; both of which would tend to replace the gaseous O2 in the water. This is why we typically see, at least with the Ice Machine, bubbles rising horizontally on the screen.

Share this post


Link to post
Share on other sites

I wasn't sure this topic would get any attention. Thanks for the updates. So should I pay more attention to temp or doesn't it matter during winter if you are fishing your bait 6-12 inches from the bottom?

Share this post


Link to post
Share on other sites
Guest
This topic is now closed to further replies.
Sign in to follow this  

  • Your Responses - Share & Have Fun :)

    • Britt: Do you know where to view the Ruffed Grouse Society Invitational Hunt in Grand Rapids MN annual harvest statistics by year? Thanks.
    • Watch their interference disappear when you shut your marcum off 🤨
    • Rick was going to start that topic right after this one slowed down! 😅
    • Don't be fooled by stainless cables. Take proper care of them and change them every few years.Do your pivots every couple years too.
    • Might as well get augers in on this too!
    • Just counted 14 of them under and on my feeder. Cardinals, Nuthatches, Juncos, and asst sparrows came in and they chased them all away. It's like one stands guard and chase everything off. Sorry guys, time has come to start thinning the blue rats out! 
    • Fishing_Novice 6th win with 302 2--BlackLundProV              239 3--Juneau4                          229 4--huckfin                            202 5--icefshinnut                     195 6--Rip_Some_Lip                194 7--mnwildman                     193 8--rl_sd                                  191 _________________________________________ Season Total 1--Fishing_Novice               8709 2--Juneau4                           8419 3--BlackLundProV               8382 4--huckfin                             8288 5--icefishinnut                     8204 6--Rip_Some_Lip                8084 7--mnwildman                    8045 8--rl_sd                                7375 9--Swiveldigger                  7096
    • nope..........havent graduated to posting meme's yet!!!!!!!!!
    • Have a marcum LX9 also use a couple Lowrance units. After using them side by side there are features I like on both but just comparing sonar units I'd have to say that my lowrance units squeak out a win for me over the Marcum. Both are very close to the same performance. The Marcum is much easier to just plop and fish where the lowrance units you have to dial in for each situation. I've never been a traditional flasher guy and never see the need to after using a graph.
    • Yep put mine away this past Saturday. I haven't used it since August. I wanted to park my truck inside instead and I would rather hunt then fish anyways...
×