The striker has netted 12 goals in 27 League One outings this season and is comfortably the Blues’ top scorer.
His efforts have been the saving grace in a underperforming side this campaign, and the 26-year-old currently sits third in the highest scoring charts in the third tier.
But how does Bishop and Pompey’s front men compare to the rest of League One?
We’ve taken a look at WhoScored.com to discover who they’ve rated as the most prolific strikers in the league.
Here’s what we’ve found.
9. Josh Windass - Sheffield Wednesday
Appearances: 25; Goals: 7; Assists: 5; WhoScored rating: 6.93. Photo: Clive Mason
10. Colby Bishop - Pompey
Appearances: 27; Goals: 12; Assists: 1; WhoScored rating: 6.94. Photo: Jason Brown
11. Josh Coburn - Bristol Rovers
Appearances: 18; Goals: 9; Assists: 0; WhoScored rating: 7. Photo: Stu Forster
12. Conor Chaplin - Ipswich
Appearances: 28; Goals: 12; Assists: 3; WhoScored rating: 7. Photo: Stephen Pond