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Joined: Oct 2010
Posts: 52
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OP
Joined: Oct 2010
Posts: 52 |
I've sprayed Roundup around my pond for 20+ years without any adverse effect on my fish........ Have experienced a fish kill 24 hours after spraying, the last two times I've sprayed this summer. I'm careful not to spray directly into the water & there was no run off rain involved. Why suddenly is this happening?
Last edited by Handsome54; 08/30/11 11:43 AM.
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Joined: Apr 2002
Posts: 1,488 Likes: 2
Lunker
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Lunker
Joined: Apr 2002
Posts: 1,488 Likes: 2 |
Although strange that it has happened twice, Roundup is unlikely a contributing factor - assuming you weren't treating aquatic vegetation. Did any unusual weather events coincide with those two treatments? Some details about the fish-kills would be helpful. Specie(s)? Big fish? Small fish? Both? Did they seem oxygen-stressed or lethargic before dieing? Are you aerating the pond? etc
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Joined: Oct 2010
Posts: 52
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OP
Joined: Oct 2010
Posts: 52 |
No unusual weather...... No aquatic spray... I've lost 15 CF in the 3-5 # range, lots of hybrid BG & a hoard of shiners.... All seemed oxygen deprived.... No areation being used.
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Joined: Apr 2002
Posts: 1,488 Likes: 2
Lunker
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Lunker
Joined: Apr 2002
Posts: 1,488 Likes: 2 |
Have you checked the water-temp at different depths? Actually, how deep is the pond (max and avg)? Any significant weed or algae populations in the pond? Is the water colored a deep/dark green - or, does it have any floating layers of bright green material?
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Joined: Oct 2010
Posts: 52
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OP
Joined: Oct 2010
Posts: 52 |
Haven't checked the temp.....Current average depth of about 6-8'/ 10'max. No vegetation..... Water has turned a murky chocolate color. Pond surface area is about 3/4 A, 20+ ft deep when full....
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Joined: Apr 2002
Posts: 1,488 Likes: 2
Lunker
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Lunker
Joined: Apr 2002
Posts: 1,488 Likes: 2 |
Water has turned a murky chocolate color. Sounds like a "turn-over", resulting from thermally-statified water in the absence of adequate water-column circulation. If this sounds confusing, it basically means that anoxic (non-oxygenated) cooler water from deeper areas of the pond rapidly mixed with warmer/oxygenated surface-water (possibly in response to a weather event, cold rain, etc) - producing a net level of dissolved-oxygen that was insufficient for fish-survival. Small/deep ponds that lack natural or artificial circulation seem notoriously susceptible to this scenario. Lots of discussion on this subject in the "Aeration" section of the forum.
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Joined: Oct 2010
Posts: 52
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OP
Joined: Oct 2010
Posts: 52 |
Thanks Kelly! This sheds some light on these strange turn of events.... I was kicking myself for having sprayed Roundup, but still could make no sense of it all.... Guess it was just coincidence... I'll do some homework in the aeration section.
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