Mark Cuban is bidding farewell to "Shark Tank" after 16 seasons ... and he's already circling the waters for his ideal successor.
The billionaire businessman tells TMZ that Emma Grede -- the co-founder of the Kardashians' fashion empires SKIMS and Good American - would be "insanely good" as a full-time Shark ... having guest-starred on the show before.
Mark heralds the 41-year-old as a brilliant entrepreneur ... with an extraordinary knack for helping companies grow with her experience.
What's more ... he's impressed with her natural ability to connect with others .