Thoughts on this - Tweaked SD

[dr exum]

I think i have four of these -

2 sold as “yellow fin SD” - Mike

2 sold as “Torquatis “(so) - Steve

anywho - as i ponder what to do as i have 3 gimpy specimens out of the 20 i brought in -

does this appear to be trauma vs genetic defect?

it’s not going to straighten out ya?

 

[FJB]

From the pictures all I can say is that they are in the genus Myloplus/~Myleus. They certainly are not Metynnis, as they seem to have small adipose fins (but I can barely make them out), as opposed to long adipose fins. Seeing them on side view will make possible to offer objective guesses and better ids.
I don’t know what they call ‘yellow fins’ as more than one spp in the genus can have that. By ‘torquatis’, M. Torquatus is probably meant.
Regarding the curvature of the spine, it is very difficult to say - I consider more likely that is the result of physical damage early in life, than a genetic defect. However, who knows…
Regardless, these fish can grow quite large, in the 8-10” range or larger, depending on conditions.
They probably will turn out to be gorgeous, including Cuasimodo. I would love to eventually see better pictures!
If you don’t mind the question, what kind of price did you get on those?
Lucky you!!!

 

[dr exum]

From the pictures all I can say is that they are in the genus Myloplus/~Myleus. They certainly are not Metynnis, as they seem to have small adipose fins (but I can barely make them out), as opposed to long adipose fins. Seeing them on side view will make possible to offer objective guesses and better ids.
I don’t know what they call ‘yellow fins’ as more than one spp in the genus can have that. By ‘torquatis’, M. Torquatus is probably meant.
Regarding the curvature of the spine, it is very difficult to say - I consider more likely that is the result of physical damage early in life, than a genetic defect. However, who knows…
Regardless, these fish can grow quite large, in the 8-10” range or larger, depending on conditions.
They probably will turn out to be gorgeous, including Cuasimodo. I would love to eventually see better pictures!
If you don’t mind the question, what kind of price did you get on those?
Lucky you!!!

i’ll put up some side photos -

looks like steve was $100 and mike $50

gonna hold out for the lil curved guy a bit more - i couldn’t notice until i had them out of the tank

 

[FJB]

Although I am almost certain the curved guy (Cuasimodo) will not straighten at all, I would not get rid of it, and it can still be a very nice fish. On side view, it may just look slightly funny, not much worse. Perhaps you can ask for credit or an additional fish? Don't tell them you are keeping it...
Last year I got a group (15) of Colombian tetras, and only later realized that one of them has something that looks quite similar as yours. One can barely notice it (except from above), and he is very boisterous and assertive, and is one of the most colorful ones!
Congratulations on your purchase. They look awesome and I look forward to seeing additional pictures. Thanks!

 

[Hatredy]

I found this in a search.
Tuberculosis
If a fish has a bent or curved spine, it is most likely infected with a Gram-positive mycobacteria (Mycobacterium marinum or M. fortuitum). https://be.chewy.com/common-tropical-fish-diseases/

 

[FJB]

That can be true, but not always.
"Fish tuberculosis" (also referred to as "tysis" (spelling?)) has been a term used to explain many things in fish, sort of a catch all term to explain many unknown maladies. My mother taught me that one in the 60's and it continues to be heard at various times. Fish tuberculosis is NOT caused by the same agents as the tuberculosis disease in humans or other mammals.
With the fish in question, side-to-side bending is the best descriptor of the deformity.
In most (all?) cases referred to as "fish tuberculosis", it is a vertical curvature of the spine (that is, the posterior end of the fish is bent down, and the very end may even bend upwards again). "Tuberculosis" (whatever that may be) is also most often co-occurring with sunken abdomen and general decline of the fish health, including not having energy to even try to eat or scape.
I strongly doubt that is what the SD has, although of course I don't know and I could be flat wrong (not for the first time).

 

[dr exum]

thanks guys!

i wonder if there is some tysis in my systems ….

 

[FJB]

That could be, but that would not explain the side-to-side bent dollar. Didn’t it just arrived? I could have misunderstood. Regardless, the side to side bent argues against ‘tuberculosis’.