At some fishing destinations around the globe there can be a question of who is fishing for who. One might want to always be aware that the perspective can change. Here is an example....
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Yes you must be aware of things like that but you have to pay attention to the size and details of it's mouth. Those fish look to be Arapaima and although huge fish Arapaima do not have big teeth so they wouldn't be able to chop a limb clean off without a good amount of time. Also the fish is huge but the mouth only takes up a small proportion of it's body so the person would have to be a baby between 1-3 to really be in danger. And size doesn't always really mean anything when it comes to dangerous fish. This one would be very hard to come across but another example would be the Mantis Shrimp, this Shrimp is able to punch as hard as a 22 caliber bullet, and has been known for taking fingers off when kept as pets.
I think we should be aware of that wherever we fish even Lake Ontario and such, because we never really know whats in there.