Searching for the Mermaid

Jacob, Jacob look into the water I shouted, what's that moving, what's swimming around your stone. Where ask Jacob. Behind you I said. Jacob turn looking behind him he saw a tall big body swimming into the water. Its a shark shark, shark he cried out. A shark I called out, shark do not swim in rivers. Jacob scramble to stand on the stone. I also stand up too, both of us with our lines into our hands looking. The body of the thing swims around us. We stand silently looking into the water. It swims way out to a big rock where it goes under before reappearing once more.