NaH2O
Well-known member
- Joined
- Jan 25, 2004
- Messages
- 8,568
aquariumdebacle said:The only thing that works for ich 100% is copper and QUARENTING!. Dropping the salinity is not absolutely effective and it is dangerous to the fish. Anything below 1.017 specific gravity is pressing your luck. I recommended it and they brought it down to 1.010 and the only thing that lived was a spine cheek and he developed spots when the salinity was brought up (slowly) a month later.
That is not true. Fish are less stressed at hyposalinity conditions as they don't have to work so hard at osmoregulation. Copper is more stressful to the fish than hyposalinity:
Copper suppresses immune function and is highly stressful to fish. Copper is also toxic to fish, but to a lesser degree than with invertebrates. Administering a dose that is too high may kill the fish being treated. If the copper level is not high enough then the treatment will be ineffective. This necessitates testing the copper level twice a day and making adjustments as needed.
From an article I posted a link to on post #20.
Here's some info from Reducing Losses Associated with Transport and Handling in Marine Teleost Fish
Significant portions of post shipment losses are due to osmoregulatory dysfunction and stress-mediated diseases occurring within the first week after transport (Johnson & Metcalf, 1982. Carmicheal et. al, 1984). Stress in fish causes osmoregulatory dysfunction (Harrell & Moline, 1992. Weirich et. al, 1992). This can lead to mortalities (Tomasso et. al, 1980). Reducing the gradient (difference in salinity) between the internal fluids of fish and the surrounding ambient water alleviates water and ion disturbance ((Wedemeyer, 1996). Manipulating the salinity of the transport water upward for freshwater fish and conversely downward for saltwater fish is effective for controlling osmoregulatory disturbances and reducing losses (Carneiro &Urbinati, 2001). Fish held in water that is close to isotonic (the salinity of the surrounding ambient water is close to the internal fluids of the fish) have increased stress resistance (Lim et. al, 2000). These fish also display a significantly lower mortality rate at 7 days post shipment.
Here is another article: Quarantine of Marine Fish (Teleost) Using Hyposalinity
The other advantage that is of great interest with hyposalinity, is the reduction of osmotic stress on fish with abrasions or lesions. In theory, the reduction of the osmolar gradient between the internal tissues and the surrounding environment would be beneficial to injured mucus and epidermal tissue. This reduction in the osmolar gradient, in theory, greatly reduces the loss of water from the fish to the surrounding environment. The ability to maintain hydration in an injured marine fish too small to administer fluids could prove very beneficial. Many more studies, which are ongoing at this time, and sample collections remain to prove this theorized aspect of low salinity.
That article advocating slowly dropping down to 11 PPT.
aquariumdebacle said:A method that I am interested in but have not had a chance to try is moving the fish every two days for a week to a clean sterile container. That way the trophonts can drop off and not have a chance to reinfest the host(s).
This was also discussed in an article linked earlier. Every 3 days for a total of 4 transfers is what is recommended.