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12 hours ago
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Joined: Sep 2010
Posts: 13
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Joined: Sep 2010
Posts: 13 |
I have confirmed that Tilapia are not legal in northern CA. I was misled by some information I found.
Our pond had two fish species in 2010 when I drained it most of the way. I netted fish from the teeming pool at the bottom to have a look. One was orange, about 3" long, a goldfish I guess; and the other was shaped like a bluegill but with a pronounced dorsal bump and only 3-4" long. I probably killed them by reducing their pond to a puddle for several summer months. What were they? The Azolla became a problem starting in 2012, so I guess the fish had been keeping it under control.
T. Gray Shaw
ISA Certified Arborist # WE-1037
Redway and Berkeley, CA
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Joined: Sep 2010
Posts: 13
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Joined: Sep 2010
Posts: 13 |
Currently I'm on a new tack against my Azolla problem. The water column is very dark with suspended organic matter (confirmed with 400x scope) and starting to go anaerobic. Sediment has dramatically increased over the winter, based on material coming through the pump.
Solving the sediment problem led me to discover biological muck elimination with bacteria, offered by several companies. Does anyone have experience with this?
One company, Clean-Flo, packages aeration equipment with bacteria and enzymes. They suggest that nutrient reduction (from the muck) will control Azolla as well. Is that likely? I had not considered it because Azolla fixes its own nitrogen through symbiosis with Anabaena.
Azolla has accelerated the existing muck problem caused by tree leaves. The trees are cut back, and I hope to manage the muck against future leaf drop using bacteria. There is no other known source of nutrients.
T. Gray Shaw
ISA Certified Arborist # WE-1037
Redway and Berkeley, CA
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Joined: Jan 2009
Posts: 29,788 Likes: 1295
Moderator Ambassador Field Correspondent  Lunker
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Moderator Ambassador Field Correspondent Lunker
Joined: Jan 2009
Posts: 29,788 Likes: 1295 |
Currently I'm on a new tack against my Azolla problem. The water column is very dark with suspended organic matter (confirmed with 400x scope) and starting to go anaerobic. Sediment has dramatically increased over the winter, based on material coming through the pump.
Solving the sediment problem led me to discover biological muck elimination with bacteria, offered by several companies. Does anyone have experience with this?
One company, Clean-Flo, packages aeration equipment with bacteria and enzymes. They suggest that nutrient reduction (from the muck) will control Azolla as well. Is that likely? I had not considered it because Azolla fixes its own nitrogen through symbiosis with Anabaena.
Azolla has accelerated the existing muck problem caused by tree leaves. The trees are cut back, and I hope to manage the muck against future leaf drop using bacteria. There is no other known source of nutrients. I would contact these people: Bugman They custom blend bacteria to work the best in YOUR pond. If going the bacteria route, I would do that to give it the best chance of working. But, bacteria is a long term process, it won't be a "quick fix". For a quick fix, and a long term solution, I would look at hitting it with a herbicide, and starting a bacteria treatment program with the correct bacteria.
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