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Joined: May 2014
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More on danger from cyanobacteria in our ponds. Yes, in some circumstances it even pollutes the air. Interesting!

https://www.upi.com/Science_News/20...bloom-airborne-atx-toxins/6441617366550/


7ac 2015 CNBG RES FHM 2016 TP FLMB 2017 NLMB GSH L 2018 TP & 70 HSB PK 2019 TP RBT 2020 TFS TP 25 HSB 250 F1,L,RBT -206 2021 TFS TP GSH L,-312 2022 GSH TP CR TFS RBT -234, 2023 BG TP TFS NLMB, -160




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Hopefully Bill Cody will chime in, there are only a few cyanobacterias out there, and they are only toxic after they die. Manage the nutrient loading in the pond and you will never have that problem.


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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).
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There were two ponds, at the fringes of where I travel to fish that had what I think may have be golden algae blooms last year. Both resulted in fish kills. Now this algae isn't cyanobacteria but can and does produce toxins that have been problematic in Texas particularly. One thing I will say about each of these ponds is that each receives large loads of fertilizer and herbicides. One is fed from tiles underlying many acres of soccer fields, the other is in a public park which receives drain from a large subdivision which had strict rules for lawns which includes the control of nuisance vegetation.

Though blooms of various kinds can happen and might possibly be unpreventable, it might also be that we have much more to learn. Where we humans have smaller impact, these problems are much rarer. Pristine waters tend to have diverse assemblages of algae and blue green algae where all contribute to the greater good of the system. The enemy is less the algae and much more our ignorance and complicity.


It isn't what we don't know that gives us trouble, it's what we know that ain't so - Will Rogers


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Quick bit of research reinforced the role of warm, stagnant, nutrient-rich water in cyanobacteria blooms. Thus, systems that move water & help cool near surface areas should be helpful, as would floating islands that take out excess nutrients. Also, of course, it is smart to see if nutrient load can be reduced at the source(s) in the watershed.

Even with liming & fertilization, I struggle to get a good phytoplankton bloom, but maybe that's not entirely a bad thing as it also means less danger of cyanobacteria bloom. As for the airborne toxin, I remember reading years ago a claim that even walking around a lake infested with blue-green algae could cause amyloid plaque brain changes similar to Alzheimer's, though I haven't seen much on that since then.

PS I wonder if filter feeders like paddlefish or threadfin shad might be useful? Or perhaps vigorous harvest of other fish might help remove some nutrients. Another reason to take out LMB?

Last edited by anthropic; 04/04/21 10:21 PM.

7ac 2015 CNBG RES FHM 2016 TP FLMB 2017 NLMB GSH L 2018 TP & 70 HSB PK 2019 TP RBT 2020 TFS TP 25 HSB 250 F1,L,RBT -206 2021 TFS TP GSH L,-312 2022 GSH TP CR TFS RBT -234, 2023 BG TP TFS NLMB, -160




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6 or 8 144 sq. ft. floating islands wasn't enough to remove enough nutrients from a 3.8 ac pond.(av 9' depth). It had a high nutrient load, getting runoff from a large field for years. Yearly alum treatments has got the cyanobacteria in check now.


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I remember reading that floating islands need to cover 4 percent of water surface, on average, to clean up heavy nutrient load. Perhaps alum treatments are a more budget friendly approach.


7ac 2015 CNBG RES FHM 2016 TP FLMB 2017 NLMB GSH L 2018 TP & 70 HSB PK 2019 TP RBT 2020 TFS TP 25 HSB 250 F1,L,RBT -206 2021 TFS TP GSH L,-312 2022 GSH TP CR TFS RBT -234, 2023 BG TP TFS NLMB, -160





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