wondering how big shovelnose catfish get

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It depends on what species you include as shovelnose cats, IMO they include the following,

Sorubim maniradii (UNK) 10"SL
S. elongatus (slender) 12"SL
Platysomatichthys sturio (sturgeon catfish) 16"TL
Sorubim lima (duckbill) 19"TL
Hypothalmus platyrhynchus (porthole shovelnose) 19"SL
H. edentates (highwaterman) 21"TL
Platysilurus malarmo (malarmo) 28"SL
Sorubim cuspicaudus (UNK) 36"SL
Goslinia platynema (slobbering) 40"SL
Pseudoplatystoma fasciatum (barred) 42"
P. tigrinum (tiger) 52"TL
Sorubiricthys planiceps (firewood) 60"SL
Pseudoplatystoma corruscans (spotted) 66"TL
Brachyplatystoma Rousseauxii (gilded) 77"TL
and
Brachyplatystoma filamentosum (Kumakuma) 144"TL

Of course some you just can't find.
I really like the looks of the sturgeon cat (P. sturio) @ 16" TL but have never seen one for sale. This pic is from the Raubwelse site.
 
there are many types of shovelnose catfish.

In all likelyhood you have a lima or tiger shovelnose.

Lima gets maybe a foot and a half, a TSN gets 3 or 4 foot.

AWSOME!!! i got the one that gets to 3-4 feet!! but anyways, my TSN ive had him for ohh probly month and a half, and he hasent grown much, i have had an oscar for less time and he has almost outgrown him.
 
guppy did you list them in order from smallest to largest or is that a just a freaky anomally of your typing? I could swear I saw a sturio for sale on some site before, but I have been looking for a planniceps for years now with little or no luck. People seem to be shy about shipping them. i guess they are fragile shippers or something. Good luck with your shovel noses guys. I have 2 lima shovelnoses, 3 hybrids that all are mixed with TSN, and a TSN on the way. Which one do you think has the mose shovel like nose?
 
Smallest to largest was intentional, lol.
The two most shovel looking guys to me are the lima and the S. cuspicaudus (pic by Olaya-Nieto)

Socus_u0.jpg
 
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