View Single Post
  #8  
Old 07-25-2012, 07:05 AM
MadisonBoats's Avatar
MadisonBoats MadisonBoats is offline
Senior Member
 
Join Date: Nov 2008
Location: Norris, TN
Posts: 1,906
Default

Quote:
Originally Posted by Flat Fly n View Post
T.... My theory is, they are working too hard for the calories they are taking in. The caloric intake of a scud far exeeds that of a lowly midge.....
Phil, I believe this point is right on. The Clinch has primarily been running on low flows this year as compared to years previous. That makes the larger fish work harder to feed and maintain their calorie needs. Due to their increased size and density; they are not able to effectively utilize their "Karman Gait" while feeding. This causes them to burn more calories to feed and leads to weight loss. That is why you would see more snaky looking fish.

Quote:
Originally Posted by Rockyraccoon View Post
I've noticed some skinny fish, Not necessarily snakey, but maybe a little lighter than normal on some fish. I have seen a noticeable difference in fish from the hot access areas as compared to those found throughout the river. Some fish show obvious hand prints from handling. This is often a sign that somethings not right in the river. Healthy fish always appear slick, shiny, and vibrant. The "marked" fish often have discoloration, even a dark tint that looks parasitic and poor scales. This certainly isn't the case for all the fish....but it's apparent on others.

I've seen hand prints many times on the Hiwassee. It happens in when we see hard droughts in the watershed and see the water temps creep near 70. When this happens, Dissolved Oxygen directly correlates to higher water temps.


Tailwaters seem to cycle IMHO.


So many factors go into a healthy tailwater that it can be hard to pinpoint issues when they arise. The Clinch always seems to have a good hold on the most critical issue, that of water temperatures. As long as the water comes off the bottom of Norris Lake....water temps should not be a problem. Obviously, a spilling event over the top of Norris Dam could influence water temperatures depending on time of year etc. So far this year, I've not gotten a temperature higher than 56 degrees anywhere on the river.


Dissolved oxygen could be playing a part in the the fish health. The Clinch does not have a lot of shoals and riffles to help add oxygen to the river as it flows. So basically, the highest DO will be closer to the dam and will slowly fall off as it flows down river. This of course is debatable, perhaps some DO monitors could be placed periodically along the river to monitor this and to know if it's an issue or not.


The food base of the river will rise and fall with any water quality issues. I've noticed some really thick hatches this year, and some that are sporadic to non-existent. I think the declining scud/sow bug numbers over the years is a direct result of didymo and siltation. You can still find them in the green mosses and grasses, but those areas are few and far between anymore. I've noticed a lot less midges on the lower river this season. No clue as to why. Good news is there is a **** of a black caddis hatch happening now.


Anyway, lots of rambling here on my part....with no answers. Some of the fish look great, some don't. Obviously, they don't all look like they did in years past and there is an issue, or two out there that need addressing.

Dissolved oxygen or lack there of...is a problem from PO downward due to higher water temperatures and silt issues. I have found some seriously high temperatures (mid 60s) in the river from mid-tailwater downward
. The EPA really needs to spend more time up in the Coal Creek Watershed. It is continually puking fresh mud from somewhere and tons of trash. I suspect much of the runoff is from coal mining operations. With only pulses during the morning; the silt sits on the bottom and cakes under the sun. The pulse does enough to stir it back up; but, not clear it out.

The water quality from Eagle Bend down is atrocious....
__________________
“Every human has four endowments- self awareness, conscience, independent will, & creative imagination.
These give us the ultimate human freedom... The
power
to choose, to respond, to change.”



Last edited by MadisonBoats; 07-25-2012 at 07:25 AM..
Reply With Quote