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if it coats the fish and evreything else then couldnt it coat the gills just the same? i spose if it doesent kill them it might just lower the o2 uptake and slow them down a bit. maybe a co2 induced sedative..it may be best to use doctors surgical gloves when handling. as with most handling and putting them into some suspect waters some species will show up lesions from hand marks.
i know its not always seeming practical but i try keep the fish in some water as much as possible, they might struggle alittle in plastic bags but theres not as much damage as they thrash about as with a hard suface or netting. ive used a koi sock before but find that a black plastic bag is better. you can spend a little time and usher them in.
may seem padantic but if stress coat is needed the damge is already done, as much extra time spent might just remove the need for cure.
ive been very guilty before and lost a fair few fish from dodgy handling and thats what i practise now, especially when breeding. especially if im not just releasing them into a large happy volume. if theres parasites around theyre living off your fish, most wont take them out but will lead to secondary problems if waters not the best. id try find out what the parasite is and read about the lifecycle and find a treatment. once theyre in the home its harder.
i worked at a farm with crab louse and it wa near impossible to beat without wrecking the production cycles for the farm and sacrificing numbers produced.
we were using a treatment just prior to sale which would still leave some fish with a lesion. if let back into the pond theyd fix emselves up but if sold and then went through stress and into rough customer water theyd only get worse. i swore next time i started a farm that all new fish would be treated first for possible parasites. its very hard to check all areas of fish to call it guaranteed clean thats why i salt them anyway. it may be possible to remove all fish, lower water in your main holding, treat it at a high concentration, then drain and then raise it, therell bhe a low concentration then, treat fish in their tanks, then refill and release.
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