Show fish out of place nicaragua contains the only fresh water lake known to science in which big salt water fish abound says national geographic society sawfish of more than pounds sharks up to pounds tarpon and other landlocked ocean dwell ers are caught daily in the waters of oval lake nicaragua miles long and feet above the level ot of the nearby pacific ocean ceolo fists explain the oddity by saying the lake was a bay of the ocean until an earthquake lifted its basin locking out the sea streams fed by the region s heavy tropical rainfall gradually have t arned the lake water fresh |