[6] Fishgold made his promotional debut on 27 October 2018 at UFC Fight Night 138, facing Calvin Kattar.
[10] Fishgold faced Makwan Amirkhani at UFC Fight Night: Gustafsson vs. Smith on 1 June 2019.
[12] Fishgold was expected to face promotional newcomer Billy Quarantillo on 7 December 2019 at UFC on ESPN 7,[13] but withdrew from the fight due to undisclosed reasons.
[17] In his first bout post-UFC, Fishgold faced Adrian Kępa on March 12, 2023 at Levels Fight League 8, losing by TKO stoppage due to a rib injury at the end of the first round.
[18] On 20 August 2022 Fishgold debuted for Bare Knuckle Fighting Championship at BKFC 27: London in the middleweight division and lost by KO in round 2 to Jake Bostwick.