Filamentosum vs. Caprapretum

  • We are currently upgrading MFK. thanks! -neo
Thanks for the link. Don't get me wrong, I wasn't calling BS on you or something, I just hadn't heard of Brachyplatystoma migrating so far.
When I find some time I'll try and find a study about long sturgeon migrations.
Btw, not many sturgeon are anandromous. Huso sp generally are, most Acipenser are not.

Sent from my MK16i using Tapatalk App
 
necrocanis said:
This link may help. Apparently I may have worded it wrong. It is the longest reproductive migration for freshwater fish species on the planet covering 2200 kilometers. or 1367 miles.
Note: there are several brachyplatystoma species with similar migrations. This sites just one of those species. I did just a quick search and for freshwater I couldn't find sturgeon migrations more than 1000 km. Feel free to post a link telling otherwise for purely freshwater migration. :)

http://www.funpecrp.com.br/gmr/year2006/vol4-5/gmr0231_full_text.htm
Click to expand...

A book "The Catfish Connection" goes into farther detail on this subject if you'd like to know more. It also states that these catfish may have the longest migrations of any non ocean creature on the planet. :) It is not conclusive though. I cannot find my copy of this book if someone with one would like to look up the numbers they qoute and post them here that would be great. :)
 
Chub_by said:
Thanks for the link. Don't get me wrong, I wasn't calling BS on you or something, I just hadn't heard of Brachyplatystoma migrating so far.
When I find some time I'll try and find a study about long sturgeon migrations.
Btw, not many sturgeon are anandromous. Huso sp generally are, most Acipenser are not.

Sent from my MK16i using Tapatalk App
Click to expand...

Discussion and debate are how we learn so no offense at all ever. :) I was just stating what I had heard. That study I posted wasn't even the one I was speaking of. I found it just now. Makes for a very interesting read though. lol
 
Just got an email from Dr. lundberg about capapretum and filamentosum. More later tonight after I've had a chance to review it. Off to work now!!! lol
 
Ok so to summarize what Dr. Lundberg has sent I will say that in adults filamentosum has longer maxillary barbels extending to or beyond the start of the anal fin, it is lighter in coloration, it has longer lobes on the caudal fin, and the caudal fin is slightly rounded on the outer upper and lower edges, the adipose fin is slightly larger in comparison to the overall fish, body proportions are relatively similar. Dr. Lundberg retains that the easiest way to tell the two species apart is the tooth patches. Before I get int the tooth patches I would describe capapretum as having maxillary barbels that extend to the begining of the pelvic fins or just beyond, it is much darker in coloration as an adult as well, the outer edges of the caudal fin are more straight, and the caudal is less deeply forked, the adipose fin is smaller in comparison with filamentosum, comparing skull pics provided I would have to say that capapretum has a more pointed and less broad snout than filamentosum which has a slightly rounder and more broad snout. capapretum also has slightly shorter mental barbels. As for the tooth patches here is the description provided.

"described and diagnosed by its fine, densely spaced outer jaw teeth and relatively few rows of straight, depressible inner teeth"

I will also attach a drawing that I have done quickly myself to demonstrate the differences in the tooth patches. This drawing is not exact and is just a representation to show the differences.

The document that Lundberg sent is very interesting as it outlines the realignment of all the brachyplatystoma back in 2005. :)

Scan.jpg

Please not that all references and summaries made here are from Dr. John Lundberg, and his document

Brachyplatystoma capapretum: a New Species of Goliath Catfish from the Amazon Basin, with a Reclassification of Allied Catfishes (Siluriformes: Pimelodidae) John G. Lundberg and Alberto Akama. Copeia, 2005(3) pp. 492-516

Scan.jpg
 
http://www.predatoryfishkeepers.com...76-Catfish-Picture%B4s-from-Berlin-(-Germany)

Here is a link to some very nice catfish. As you can see according to what I was told and just read the IDs on the catfish of this page are actually backwards. The one he has labeled as capapretum is actually filamentosum and vice versa. :) Look how very dark the one is undoubtedly caparetum. She how short the barbels are? Also note how long the barbels are on the filamentosum. :)
 
Thanks for the info Necro. For my part, the only difference I could see between Caprapretum pics on here and the few Piraiba pics on the net, is that B.Caprapretum specimens were always darker.

Sent from my MK16i using Tapatalk App
 
I may have stirred the pot a little with this, but I will say that Dr. Lundberg says that "The jaw teeth textures are absolutely diagnostic for fila vs capa except in the smallest juveniles/post-larvae and the color feartures hold up with some variation and one must consider the changing patterns between juveniles and adults within species but both are distinctive." end qoute.

So imo he's saying that they have distinctive coloration and that to be 100% which species you have you must examine the tooth patches of live individuals. Sub adults and adults are far easier to distinguish based on morphological characters.
 
Weirdfishlover, since Jools and Co are working on the ID issues raised here, I think you might be able to help them and help all by getting some good quality pics of your (supposed) capapretum and e-mailing them and a little description to Jools. Just a thought, nothing else.
 
You must log in or register to reply here.
MonsterFishKeepers.com
Top Bottom