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River Negro in the Amazon
The double dorsal with the ventral makes me think it's either a Dwarf long-whiskered or Iheringi-Hassar.
The spikes on catfish are modified fin rays, The fin on the "belly" is the pelvic fin, the one further back toward the tail is called the anal fin. So depending on the location of the spike add the appropriate term, pelvic or anal. Or if that doesn't work try "ventral". Greek for quill or spike is akantha. See where that gets you.
It had a long spike underneath its belly, is there a name for that?
I'd say look amongst the Pimelodidae, or Long-whiskered catfish, to start. They definitely live in SA. Since half of all catfish species live in the Amazon basin, good luck!
Lat: -3.00, Long: -60.12
Spotted on Oct 15, 2010 Submitted on Oct 15, 2010