Lake Placid: The Final Chapter (2012) on Netflix

Plot summary

Reba, once a poacher, now works as an EPA agent at Black Lake, where the Army Corps of Engineers has built a ten-thousand volt fence around a crocodile sanctuary. She and Sheriff Theresa Giove set out to tranquilize a hatchling, and Lieutenant Ryan Loflin, whose son Max is with him at the barrier, meets them on land. While Sheriff Giove's daughter Chloe and her friend Elaine travel with the Marshfield Swim Team, their tour bus misses its turn for Clear Lake and passes through the gate into the park. Poachers under Jim Bickerman enter the same gate, hunting crocodiles and collecting eggs from the nests.