Psammon is a part of water fauna, along with periphyton, plankton, nekton, and benthos. Biologically there is an important distinction between plankton and nekton. Some are benthic, but most are pelagic nekton. The diet changes as they grow but mostly consists of large zooplankton and small nekton. Many genera were benthic, others were apparently active swimming nekton. Nekton Surf Shop is between 13th and 14th Ave. The Transphibian was initially developed by the Nekton Corporation in Durham, North Carolina. Even the Nekton is, in addition to intensive exploitation, damaged by the radiation. Bioseston can be often regarded as plankton, although it includes nekton as well.