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Posts: 20248
Location: oswego, il | Besides the reflection on my ulgy mug(I sure won't be selling t-pots on ebay anytime soon), this is what we seen on the finder after the lake was stirred up by the nutballs. We always see it on any lake when the waves are up. I am talking about the balck areas that protrude downward from the surface clutter. Is this algae dispersing into the water column?
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Posts: 459
Location: New Baden IL | Todd,
sometimes when I see that, I think it's bubbles in the water. I could be way off base though.
I think it depends on how long a boat has been through.
Could the props cause enough turbulance to be picked up by the depthfinder?
Are there lots of chopped up weeds floating?
What was the water clarity like?
When Kinkaid turns into choclate milk in the spring, it often looks like that.
Rodney |
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Posts: 20248
Location: oswego, il | Rodney, I know it is not bubbles because we had been trolling all day and did not see this untlill the boat wakes stirred up the lake. No weeds in this lake, they poisoned them weeks ago. I don't recall if I have seen it up north ot not bt I have definitley seen it on the fox chain, pewaukee, indiana, ect. |
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Posts: 1916
Location: Greenfield, WI | I have had similar echos on my Bottom Line Unit at times usually at night in the last week in June on North Twin Lake. It moved up in the water column over about a half an hour time period. It turned out to be a huge lake fly hatch. |
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| We put a camera down to check out similar spots. We thought they might be some type of forage or insects. They were clear organisms, looked like small chunks of clear jello. I am not a biologist, maybe someone knows the correct name of these critters. I also witnessed the same thing on Whitefish Bay, LOW's several years ago, again with a camera.
Good luck, Murph |
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Posts: 2515
Location: Waukesha & Land O Lakes, WI | 2 things it could be
1) Algea
2) School of zooplankton critters..sometimes they suspend. We use them during the winter..panfish will sit in these schools and feed...we drop jigs down to it and clean house. |
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| That could be zooplankton rising to the surface due to the reduced light penetration that the waves create. I know that zooplankton (tiny animals) make a vertical migration at night to feed on particles and algae near the surface. They do this during low light to avoid predation by minnows, especially ciscos. If you see ciscos dimpling the surface in the morning they are probably feeding on the stragglers. Maybe the wave action tricks them(zooplankton) into thinking it is night .
If you have ever seen this at night it is really weird, your locator will black out from the bottom up. |
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Posts: 68
Location: South side | turn your depth finder to manual And Ajust the Gain Or Sensitivity Down its just cluter . |
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Posts: 2515
Location: Waukesha & Land O Lakes, WI | If your sensitivity was turned up too high, the entire background of "white" would be speckeled with greyscale dots....this does'nt look to be the case. |
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| minnows? lots of minnows? |
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Posts: 1185
Location: Wishin I Was Fishin' | Todd were you peeing in the lake again? |
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Posts: 3242
Location: Racine, Wi | So at night, when the plankton comes to the surface, and your locator is pretty black from them, if you turn the sensitivity down, will that reduce the amt of fish you see in deeper water? Say if I was trolling a basin in 90 fow, but just reading the top 20-25 feet with the zoom? |
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| Reducing your sensitivity will also reduce your ability to mark fish especially at depth. Paul Klein told me he was once over a plankton school so thick it gave a false bottom reading. Keep fishing they are setting the table for the big boys. |
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Posts: 2361
| I aggree with zooplankton, and you should see this phenomenon every evening with stable weather condition. It will not be there during the day, starts in the evening and comes up as it gets darker.
You can occasionally also see thermoclines but generally not this strong, and also if you have a current at times you can spot an inflow this way if there is a temp variation that lets the water layer strongly.
I would look for structures that intersected this line, because this definitely sets the table for the bait fish and the larger fish that eat them.
Was this a northern WI lake? Part of a flowage perhaps? Or your local stuff?
Edited by firstsixfeet 8/3/2004 6:36 PM
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Posts: 20248
Location: oswego, il | This was an indiana lake. I see it on pewaukee, the fox chain and other lakes when the waves are up only. It is only at that time. If it is calm you do not see the black areas below the clutter. It has to be some sort of turbulence but what is mixing in the water column is what I was wanting to know. |
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