Everyone knows what a submarine is - a ship that can go underwater. Hardly needs any explanation. Unless you're in the US Navy. By the Navy definition, only their modern, nuclear-powered boats ( all submarines are called "boats" ) are true submarines, designed to operate beneath the surface almost indefinitely. Anything else is merely a "submersible", tied to the surface by the need for fuel and air. Whatever.
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Sunfishes ( family Centrarchidae, along with freshwater basses ) thrive in small, shallow lakes, sheltered bays of larger lakes, and quiet areas of slow-moving streams. Pumpkinseeds (right) are normally found in shallower water and denser vegetation than Bluegills and Redears. Adult and larval insects make up most of the diet, but sunfishes also eat snails and fish fry.
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