Having shark ID issues? You are not alone lol. There are over 40 species of sharks in the gulf and some can be pretty difficult to identify, especially when they are small. In my book, The Art of Fishing for Records, I wrote, “For sharks and other hard to identify species pictures should be taken of the head, tail, belly, dorsal fin, mouth, teeth, and anal fin.” Shark identification is done mainly with the interdorsal ridge, dorsal fin position in relation to the pectoral fin, preoral length in relation to internarial width, teeth shape, 2nd dorsal fin in relation to the anal fin, and coloration.
So, from the information you provided, the shark appears to be a bull shark (Carcharhinus leucas). I am basing this on the snout length, upper teeth shape, and dorsal position. Similar sharks are the blacktip shark (Carcharhinus limbatus) and the spinner shark (Carcharhinus brevipinna). Both have longer snouts than the bull shark. The blacktip shark can be distinguished from the spinner shark by the color of the anal fin. The spinner shark has a black tipped anal fin while the blacktip shark has a white anal fin.
Misunderstanding shark identification has resulted in lots of violations so be careful if you keep sharks. Many are protected.
I hope this helps. Oh and congratulations on the great catch.