Minnows, may be considered small, but the pygmy goby is much smaller. In fact, it is the world’s smallest known adult fish. This tiny occupant of the lakes and streams of the Philippines hardly ever grows longer than one-half inch (1.3 centimeters).
As small as they are, pygmy bogies are a vital part of the marine life cycle in the lakes and streams they inhabit. They get food energy and other nutrients by eating small plants and animals.
Later, many bogies are eaten by biggest animals that absorb some of the energy and nutrients.–Dick Rogers