Does anyone have pictures of aros with droop-eye?
Genetics may not be a sufficient explanation, but I guess it would be a necessary condition present in all cases of droopy eyes.
If it is a only a matter of having to look down because of the unnatural conditions of the tank, then the lack of exercise of eye muscles, and consequent accumulation of fat, might not be a factor. After all, it would seem that the silver aro would actually be moving its eye muscles more in a tank (up, down, etc.) than in its natural Amazonian environment, would it not?
If silver aros get it significantly more often than black and asian aros, but their environmental conditions are the same, then would not genetics play a significant role here?
On the other hand, if it is the case that 95 % of wild caught silver aros sold in the Japanese market get it, then could there be other environmental factors (besides the necessary genetic predisposition) such as nitrates? higher alkalinity and hardness of water? What are the percentages of adult wild caught versus baby wild caught (after father's head has been chopped of, or so I have read) with droopy eyes? How would those numbers compare to farm-raised?
On the other, other, hand, how much inbreeding goes on with asian aros, particularly with the problem of a fish in imminent danger of extinction in the wild (CITES category I)? Why is it that many fewer of them get droopy eyes? Also, what's the deal with black aros? Someone posted that many fewer of them get droopy eyes? What about australian and african aros? Do they get droopy eyes?
Does anyone know about any studies on this issue? I am just learning about these matters, but I am curious about it. (I would also like to find out whether it is possible to avoid droopy eyes in Assassination Tango

)
Thanks.
Masa