I want to verify I have a Pseudoplatystoma corruscans

[thefredpit]

I really cant see how these are being mistaken for corruscans the hybrids look nothing like a corruscans. The head and body shape is nowhere near the same. The only link i can see is the pattern but even that is only cos they both have spots.

Part of the problem I think is it being difficult in finding juvenile pictures. Also I have seen the 2 of these I have had transition between 3 different patterns, starting spotted then going completely striped to this so it makes it tricky identifying them for the layman

the one in the pictures above is the one on the right below but the one on the left below now also looks like the one above

 

[dazzapolypterusweeksii]

the one in the pictures above is the one on the right below but the one on the left below now also looks like the one above

View attachment 1451821

I beg to differ the head on the hybrid in that pic is nothing like a shovel in the likes of a tsn species.its got achara written all over it.

 

[thebiggerthebetter]

Right. Comparing patterns is a good start but only a start, and of very limited value in species where the pattern heavily evolves... one has to go farther and really compare the body proportions, head shapes, fin location and shape, etc. if they wanted to get at the ID.

TSNs have a shovel shaped head, long flat snout. And a small adipose fin versus the achara and the hybrid. Just for two.

 

[Fishman Dave]

I think much of the confusion over the fish we see in the hobby nowadays is of our own making. Obviously the crossing of fish is creating a problem where we get fish that look very similar to one parent but with a slight skeletal similarity to another.
When the fish pictured later still had the stripes it looked more corrusacans than currently but not if you look at the head.
But we also see an awfull lot of runts coming through too nowadays which unfortunately are the real thing but are hard to tell they are because of deformities.
It’s sometimes easier to say a fish is not the real deal just cos it’s not a good example of type than it is to say that it is the real deal.
Albeit, sometimes it’s blatantly obvious.
I find some(not all) tsnxaccharra hard to tell when young but generally all are straight common tsn x.
This one is easy to tell purely on head shape, ignoring any colour or pattern

 

[thebiggerthebetter]

Whenever we see them runt TSNs with a snout deformity, it is never merely short versus the norm but invariably the snout is more or less obviously misshapen, most commonly along the lines of the notorious so called camel-face, duck-bill deformity.

 

[thefredpit]

Whenever we see them runt TSNs with a snout deformity, it is never merely short versus the norm but invariably the snout is more or less obviously misshapen, most commonly along the lines of the notorious so called camel-face, duck-bill deformity.

don't forget dolphin

 

[vincentwugwg]