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Moderator Ambassador Field Correspondent Lunker
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OP
Moderator Ambassador Field Correspondent Lunker
Joined: Aug 2004
Posts: 8,854 Likes: 1 |
Read this article, and find the "clue" why Pond Boss magazine and Pond Boss "Ask the Boss" can be so valuable. http://www.myfoxtwincities.com/story/24101170/lake-owasso-shoreview-fish-killFall chemical application to kill aquatic vegetation? Hmmmm.
Holding a redear sunfish is like running with scissors.
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Joined: Dec 2009
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Hall of Fame 2015 Lunker
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Hall of Fame 2015 Lunker
Joined: Dec 2009
Posts: 6,692 |
Just a side note: Do you know that testing for VHS and others have killed countless many more fish than the affliction's ever have? And, they never find them Just some crap that needs to be fixed, but doubt it will be anytime soon.
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Joined: Feb 2007
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Lunker
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Lunker
Joined: Feb 2007
Posts: 1,255 |
Ouch!! Those are some beautiful fish they killed. I'm guessing Whitecap/Sonar....
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Joined: Jan 2009
Posts: 28,537 Likes: 843
Moderator Ambassador Field Correspondent Lunker
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Moderator Ambassador Field Correspondent Lunker
Joined: Jan 2009
Posts: 28,537 Likes: 843 |
Possibly. But at 300+ acres, I doubt that it was due to an overdose. More likely the decaying weeds used more O2 than normal and by the pictures, the clarity doesn't show a lot of phytoplankton. No snow cover, so there was enough sunlight during the day if there weren't heavy clouds.
In looking at the fish survey, it seems that the BOW was forage heavy and they were stocking predators to rectify the situation. No worries now, the lake isn't overpopulated anymore.......
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Joined: Mar 2005
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Moderator Hall of Fame 2014 Lunker
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Moderator Hall of Fame 2014 Lunker
Joined: Mar 2005
Posts: 21,499 Likes: 267 |
Over carrying capacity with stress followed by an event. Even a minor one will add enough stress to push it over the edge. Studies indicate that waters that winter kill often do so repeatedly -- my guess is they cycle from few fish to past carrying capacity and it winter kills again. Anyone know this lakes history ?
Another possibility is very rapid cooling which will also do that even with enough O2. Rapid cooling causes a lipid imbalance at the cellular level and the fish muscles stiffen up causing them die.
Last edited by ewest; 11/30/13 08:06 PM.
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Joined: Mar 2005
Posts: 21,499 Likes: 267
Moderator Hall of Fame 2014 Lunker
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Moderator Hall of Fame 2014 Lunker
Joined: Mar 2005
Posts: 21,499 Likes: 267 |
Here is the info ;
Although it has been hypothesized that temperature is closely linked to membrane composition, relatively few studies have been conducted to determine if a correlation exists between lipid composition and cold tolerance. This study was designed to determine the effect of a sudden temperature change (a simulated cold front) …
Fish deaths due to cold temperatures have frequently been reported. It is generally believed that deaths arise from the rapidity of dropping temperatures whereby the fish are unable to acclimate to the lower temperature despite being within their biokinetic range. In these fish, the fat apparently hardens in the colder water, causing the fat-impregnated muscles to stiffen and the fish to become exhausted and lose movement. The rate of increase in the ability of fish to tolerate higher temperatures usually requires less than 24 h at temperatures above 20C, whereas the gain in resistance to lower temperatures is a much slower process, requiring up to 20 d in some species (Doudoroff 1942; Brett 1944). The rate of resistance to lower temperatures is governed in part by the rate of metabolism, which is depressed at lower environmental temperatures. The simulated cold front in this study resulted in higher mortalities
The rapid onset of cold temperatures has been reported as the cause of death in several species of fish (Verril 1901; Storey 1937; Galloway 1941; Gunther 1941; Ash et al. 1974; Coutant 1977; Mitchell 1990). It is believed that the lipid composition in the fish muscle plays a vital role in the ability of fish to adapt from one temperature to another (Hazel 1984; Greene and Selivonchick 1987; Henderson and Tocher 1987). Phospholipids are the class of lipids in which the most obvious changes occur.
the ability of a fish to alter its lipid composition when placed in colder water is one factor that determines survival.
This study was designed … determine the effect of a sudden temperature change (a simulated cold front) on striped bass, white bass, and their hybrids fed either a natural or prepared diet, as well as to determine their lower incipient lethal temperature. The association of fatty acid composition and unsaturated: saturated fatty acid ratios in these fish were examined with respect to their tolerance to cold.
The dynamics of lipid composition of cells occurs in order to maintain a constant fluid matrix for enzymes associated with membranes (Greene and Selivonchick 1990). Different species of fish differ in their patterns of fat deposition and mobilization, which in turn affects the temperature range in which the species can grow and survive. For example, the Nile tilapia Oreochromis niloticus does not store excess lipids in the musculature but rather relies on visceral deposits that it is incapable of mobilizing at low temperatures, which results in high mortalities between 8C and 6.5C (Satoh et al. 1984).
Last edited by ewest; 11/30/13 08:44 PM.
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Joined: Aug 2004
Posts: 8,854 Likes: 1
Moderator Ambassador Field Correspondent Lunker
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OP
Moderator Ambassador Field Correspondent Lunker
Joined: Aug 2004
Posts: 8,854 Likes: 1 |
Great infomation.
A strong lesson to learn from all fish kill events that often the situation is exacerbated by an accumulation of stressors. i.e. plant death/oxygen sag combined with sudden temperature drop, combined with possibly pH changes, etc.
Holding a redear sunfish is like running with scissors.
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