This
list has the 63 species in the Cat-eLog that are recorded as Congo river. There are a few newly added species that aren't in that list, because I have not been updating the occurrence records lately and Jools have been adding new species.
If you go to
http://www.planetcatfish.com/catelog/search.php and select "congo" as the distribution, then you would get the above list. You can restrict it further by adding min/max length and family/genus, etc.
Edit: It appears that there are about 35 species that hasn't had their occurrence record set, just for River Congo. I'll see if I can get that done sometime after I get back from Holiday in about ten days time.
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Mats