Hard to tell how big it is but looks a few feet long.
Dr Kenneth Tighe of the Smithsonian National Museum of Natural History thinks it could be a fangtooth snake-eel. Also known as the tusky eel, it's a species native to the Gulf of Mexico which lurks in the deep and devours bony fish and crustaceans.
According to Wiki, they grow to a maximum of 84cm or 33".
According to Wikipedia, male fangtooth snake-eels can reach 84 cm (circa 33 inches) in length. Conger eels of various types can range up to 3 m in length. The American conger eel (a likely, though not sole, suspect in this case) is known to reach circa 2 m in length.
I wouldn't worry about them [if it is indeed a fangtooth snake-eel] too much - they live at depth & feed on bony fish & crustaceans. I've never heard of anyone swimming on the surface being attacked or bitten by eels. Someone will be along shortly with an example..On the other hand if you were scuba diving & messing with them they might go for you.