| No. | All keepers listed by when they started keeping this species. The longest an individual has been kept is 24 years, 5 months. |
| 1 | arapaimag since 1989-01-03 to 2013-06-23, that's 24 years, 5 months; who writes, "Tried to eat a 18" Phractocephalus hemioliopterus in my big tank." |
| 2 | yellowcat since 2005-03-24 to 2022-04-25, that's 17 years, 1 months; who writes, "Reached maximum size of 18.5"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 to 2010-08-15, that's 4 years, 11 months |
| 4 | amiidae since 2007-07-04 to 2009-07-04, that's 2 years, 0 months |
| 5 | Redtailrob since 2008-06-01 to 2016-01-08, that's 7 years, 7 months; who writes, "Huge mouths on these fish.Capable of taken food items almost half their size." |
| 6 | jelly since 2009-02-08 to 2016-05-27, that's 7 years, 3 months |
| 7 | mcaquatic since 2021-10-28 to 2023-10-28, that's 2 years, 0 months |
| 8 | N_F_S since 2024-04-04 to 2024-11-21, that's 0 years, 7 months |
