Sea salts or salt (sodium chloride) has been used as a dip or bath treatment of freshwater fish for the control of external fungus infection, a few protozoan ectoparasites (e.g. Epistylis), fish lice and Argulus. When fish are transported salt has also been used to reduce stress by lessening the work fish have to do for osmoregulation. Salt or sodium chloride is considered as safe for the treatment of fish intended for human consumption.
For the treatment of ectoparasites, salt is usually administered as a dip. For dosage calculations, salt is considered as 100% active. Dosage level suggested are in the range of 25 to 30 grams per liter and exposure duration from three minutes to as long as one hour. During treatment fish must be carefully watched and removed from the salt solution if signs of stress arise.
To reduce osmotic stress the dosage of salt is 1 to 2 grams per liter as an indefinite bath.
There is no withdrawal time for sodium chloride treatment of fish before the fish can be marketed.
See also:
Duration | Percentage | Salt Lb per 10Gal Water | Disease / Issue |
---|---|---|---|
30-60 seconds | 3% | 2.5 lb | exterior parasites |
30-60 minutes | 1.2% | 1 lb | Thin mucous layer |
days | 0.18% | 0.25 lb (4oz) | Nitrite toxicity |
indefinent | 0.18% | 0.15 lb (2.4oz) | Ongoing issues |
Comments:
We have one healthy dropsy survivor tilapia. Now thinking of him as a super-breeder w DNA to help survive. We suspect the cause was the small amount of dirt from plantings someone gave us and that we stuck in our gravel ebb and flow bed last Spring... Another factor and even worse, we knew it was not best practice, but we have not cleaned the large gravel bed in 2 years or so. Comments welcome. Although we used the salt treatment 3 times in 8 months or so, and it seemed to help at first, w/out knowing what was in the gravel bed causing the water to lower immune system of the fish, in the end the treatment did not save them.+
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