Ozark Sharks (2016) on Netflix

Plot summary

A lakeside cabin in the Ozarks is where Rick and Diane Kaye have decided to take their children, Harrison and Molly, and their grandmother for a vacation. Molly's boyfriend Curtis takes a bus to join them, and he and Harrison meet Jones, a local shopkeeper with a stock of guns. A bull shark goes after Harrison in the water and Jones shoots it. The sheriff will not act on their report, and Jones, who has seen sharks in these lakes before and never known them to attack, believes something has stirred the animals up. Molly, Curtis and Jones take Jones's guns out onto the lake, and Rick and Diane set off in a canoe.