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The Loach Forum Archives (1)
Re: Can you ask you source...
Posted By: Wintek <wintek@aol.com> In Response To: What have I started... (BB)
Date: Thursday, 30 September 1999, at 5:00 p.m.
Hello BB
Does the "burn" occur while in the O2 filled shipping bag, or after release into the new tank? I'd guess after. Purely fabricating a hypothesis, it sounds like the oxygen (which is the same O2 regardless of how it is "manufactured") in the bag is dissolving into the shipping water at higher than "normal" concentrations, and then into the fish's blood at higher than normal concentrations. Joe Loach has mentioned in the past problems with O2 shipping of labrynth breathing fish such as Betta's, so I would further surmise that gills are capable of regulating a constant concentration of O2 in the blood, but those fish that have supplemental breathing mechanisms are going to get extra O2 in their blood when packed in bags with O2. Putting the fish then into waters with substantially lower O2 concentrations causes the O2 to outgass from the blood and the hemmoraging mentioned. Then again, the extra O2 itself in the blood could cause the hemmoraging.
Some ancedotal comments are that the plastic involved will have a very large influence in how long it takes for O2, CO2, Ar, N2 ... to diffuse through the plastic and return to being just plain old air again. This happens slowly (a very WAG, maybe 4 hours?), but once you've got normal air in the bag, then I would guess that the fish wouldn't end up with the hemmoraging problem. This also means I'd guess that fish in a bag longer than 6? (four hours to reach air concentration, and 2 hours to use up the remaining O2?) hours are subject to O2 deprivation.
Just meaningless drivel!!
Wintek
