01. Bull Shark![](http://800005.xyz/files/funzug/imgs/wildlife/terrifying_killer_fish_10.jpg)
This last fish is, technically, still a shark. However, it is so far from a typical shark that it poses threats beyond the worst nightmares, and deserves the number one spot on this list.
The Bull Shark is a 7-12 foot fish weighing over 600 pounds – but with a difference. It thrives in fresh water, and can travel thousands of miles up rivers and into lakes, even as far inland as Missouri, Illinois or Kentucky! Bull Sharks have caused many deaths in murky freshwater environments, the notorious case being the New Jersey river attacks. Bull Sharks are the most aggressive shark species, possessing the highest testosterone level of any animal. Bull Sharks also have the strongest bite force of any living fish species.