Copyright by KD Nishikigoi 2010. All rights reserved.
Dissolved Oxygen for Pond Fish, What Levels are Good and How To
Written by Dr Johnson
Oxygen is the final electron acceptor in the respiratory metabolism of the
animal cell as conducted at the level of the cells' intracellular mitochondria.
That's about all I know about it from memory. Oxygen is soluble in water but
not very well. Oxygen may rane from zero PPM up to a glorious 14 PPM.
There are a range of concentrations which have different clinical
- 3 PPM = Fish are dead and dying
- 5 PPM = Fish are extremely lethargic. Ammonia is even more toxic at this
level. Appetite is reduced or absent.
- 7 PPM = Circulation and surface exposure of water could stand improvement.
No fish will die unless something else impairs the gills or binds more oxygen
(Such as Formalin application).
- 8+ PPM are desirable
- 11+ PPM are gloious. The hobbyist with this has dancing, playful fish.
But how could you know what your dissolved oxygen is? Well, there are
chemical tests. One comes from Hach Chemical Call them at 800-227-4224
The diagnosis of a low oxygen condition is not as simple as you might think.
Of course, if you have test kits or a testing pen, you're fine. But the problem
comes when folks see a gasping fish and assume that there's an oxygen
deficiency when indeed the fishes' gills are "shot" due to pH crash or some
kind of parasitism.
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