Nice thread. Interesting. Such asymptomatic cases are pretty hard to crack.
1. What has been its diet? I wonder about malnutrition, e.g. thiaminase and the ensuing B1 deficit that leads to appetite loss and lethargy.
2. I note that there are next to zero big ecats ever shown or shared by peers, even over 1ft. From years of reading and talking to ecat owners, it seems that sooner or later they develop a deadly problem, perhaps with their biological battery, which cannot be cured and they die from it. This is guessing for the lack of better clues.
3. I hope the sudden bursts you describe are not battery related. Could be indeed parasite related but these usually lead to pangs, trembling, body contortion, not sudden desire to swim wildly.
Thanks for the response. I have been considering that this may be the result of some kind of chronic pain, or an internal problem. A problem with it's electrical system could certainly be the case. I have never heard this, and is interesting information.
To answer the first question, I have tried to keep her diet varied as much as possible. This includes alternating weekly feedings of cut fish(usually Silversides), shrimp(soaked before feeding in order to remove any excess salt), and earth worms(night crawlers and baby night crawlers), and the occasional treat of beef heart . I've tried to feed commercial pellets, but the fish ignores these. I feed every other day.
The fish, when sitting still, has taken to curling into a "U" shape, as opposed to laying straight. Experience has taught me this generally isn't a good sign. However the lack of any other distress(no trembling, no heavy breathing, no cloudy eyes, etc.) is strange. It still seems rather alert and inquisitive. If I walk up to the tank, she'll swim forward. If I out food, or my hand in the tank, she'll take a look, and the whiskers go forward.
One thing that has occurred to me, I have a piece of PVC pipe(it was new off the shelf pipe, never used for anything) in the tank for the cat to hang out in. Is it possible it could be leeching out something chemically that's poisoning the fish? It's been in there for a long time,