Most bacteria can grow to some extent in the presence of oxygen, known as aerobic culture. But for optimal growth, the conditions should be adjusted to suit the target bacterium. Species found in atmospheric conditions, such as on the skin surface or in the upper respiratory tract, will typically grow well in the presence of oxygen. Species that are naturally found in low oxygen environments, such as in deep wounds or abscesses or the deep ocean, will typically grow best in the absence of oxygen – anaerobic culture.