Two others to add are spinners and blacknose. Spinners are similar enough to black tip that they are basically interchangeable, same limits and such. Blacknose are a little complicated. They might actually be the most common shark out there. Getting a little bigger than sharp nose, they max out around 20 pounds but most are not more than 10. All sharp nose will have some white spots; blacknose will not. If you look closely at the tip of the snout of a blacknose, there is about a half inch black line, as if a black magic marker just grazed the fish's nose. They are not mentioned at all on the Alabama size and creel limits page and never get 54" to the fork so no idea on harvest legality.