If a fish is anatomically not suited for eating at the surface it should effect all frontosa.
All types of frontosa, burundi, kigoma, mpimbwe and zaire should get it.
All generations should get it WC, F1, F1+ etc.
But guess what it is rare for anything but WC to get it.
It is also rare for any type but mpimbwe and kapampa get it.
Actually, not even all mpimbwe get it, they are collected at both karema and masalaba.
so if F2 don't get it then it has something to do with being WC.
but if other wc don't get it, what is unique about kapampa and mpimbwe.
Mpimbwe and Kapampa are the deeper species.
so i will explain what is happening.
by the way, the article written by Mr. Price was nearly 10 years ago.
along time ago in scientific terms regarding an unknown condition, when they had no clue what was going on, so people did anything they could.
When frontosa are caught at 1oo feet below, they can't simply bring them up right away because of decompression.
what they do is they bring them up about 10-15 feet a day.
as the divers raise the cage, they STOP when they see a frontosa swimming funny.
they do this in stages every day.
after a week or so they reach the surface.
in this time this is what has happened.
1. Some fish died from decompression.
2. Some fish did not die, but have damaged bladder, and they show it by forever swimming in an abnormal manner.
3. Some have bladder damage, but look normal, however when they are stressed the float condition will again present itself.
4. Some will have zero damage what so ever.
this is why SOME WC mpimbwe will have zero problems, when you feed them floating foods, have air bubbles, wands etc.
this is why some otherwise normal looking mpimbwe will sometimes get float, because they were damaged in various degrees during decompression.
You could feed F100 burundi floating foods, have air bubbles and they will never have a problem.
You can do the same thing with F2 mpimbwe.
Its the WC mpimbwe, kapampa and some of the other deeper types that will have problems.