This species of shark often occupies the subtropical shallow waters of coral reefs , mangroves , enclosed bays , and river mouths ; however , lemon sharks have also been found in the open ocean down to depths of 92 m. Although lemon sharks do swim up rivers , they never seem to travel very far into fresh water .
They are often found in shallow waters near coasts and islands , by coral reefs , mangroves , bays , and sometimes even river mouths .