While no sharks are in the business of regularly eating humans, at least part of this scene is realistic: sharks do make use of inshore, estuarine environments like lagoons, bays, and the lower portions of rivers.
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In Lake Pontchartrain, Louisiana a boy was attacked by a bull shark in 2014; bull sharks have also been caught by anglers on this lake. The sharks move into the lake more in the summer months but swim back out to the Gulf of Mexico in the later part of the year.
Lake Nicaragua is the only freshwater lake containing oceanic animal life, including sharks, swordfish, and tarpon. More than 40 rivers drain into the lake, the largest being the Tipitapa River.