Strongly disagree, the last thing anyone should do is swim away faster if they're too scared of a shark that does literally nothing to them :^, it's just a myth, a mosquito kills more people in a year then a shark has ever from back then until now including attacks. You getting 100 checkpot lottery is more likely then anyone ever being attacked by a shark

There are many other texture packs only adding sharks as a %chance to replace a dolphin. Go get that instead and let us people have the dolphins replaced :)

What you want can only give you a mod, a resource pack like this one can only change what is already there. And only the textures, the names and the sounds. To let sharks spawn extra in the game is only possible with mods, etc..