Yes, from the description you have given you most likely have a male and a female. The female should be a female, because if it is around 9 inches then it has had enough time to develop it's anal fin if it was a male.Does this apply to all bichirs?.
One of my 9 inch delhezis has wide anal fin while the other one has a thinner anal fin.
My dels had the gill frills 2 months ago at 9", i thought something was wrong. Was only a few days.Ok cool. I'll get a better look at my Senegal when I'm back from work since it's in the size range to sexed. My delhezi however I think us way younger than I thought. Swear I saw gill frills when there super little .
He's not to small I fed my 2" endli massivore .... He grow super quick .... Just break the massivore in 3-4 pieces so he can eat them