| No. | All keepers listed by when they started keeping this species |
| 1 | arapaimag since 1989-01-03; who writes, "Tried to eat a 18" Phractocephalus hemioliopterus in my big tank." |
| 2 | yellowcat since 2005-03-24; who writes, "Reached maximum size of 17.5"TL. Surprisingly, for years kept in a community tank with 5 other smaller catfish species, definitely the dominant fish. Later on, best kept alone..." |
| 3 | Fishedin since 2005-09-01 |
| 4 | amiidae since 2007-07-04 |
| 5 | Redtailrob since 2008-06-01; who writes, "Huge mouths on these fish.Capable of taken food items almost half their size." |
| 6 | jelly since 2009-02-08 |
