ocean acidification: the process whereby atmospheric carbon dioxide dissolves in seawater producing carbonic acid, which subsequently lowers pH of surrounding seawater.
ocean uptake: the process whereby the ocean takes up materials such as heat, carbon, oxygen and other chemicals.
offshore aquaculture: the practice of farming fish further out to sea that is usual for traditional aquaculture. In the United States, this means farming where state jurisdiction is from 3 miles out to 200 miles where the Exclusive Economic Zone ends.
off-gassing: the slow release of gas that was trapped, frozen, absorbed or adsorbed in some other material.
Old Faithful: a geyser in Yellowstone National Park that erupts for about four minutes about every 65 minutes.
omega-3 essential fatty acids: food elements essential in the proper growth and development of young animals and purported to offer numerous additional heart and health benefits.
omnivore: an organism whose diet consists of a wide variety of foodstuffs, including plants and animals.
organic: matter that is living or was once living; grown or raised without synthetic fertilizers, pesticides or hormones; a product composed of ingredients grown or raised in this way. Foods certified as organic by the state in which they were produced or the US Department of Agriculture (USDA) have met strict regulations.
organic food: food that is farmed without the use of pesticides, antibiotics or genetically altered organisms.
Ostria: a native oyster genus of San Francisco Bay.
ovaries: the pair of female reproductive organs that produce eggs and hormones.
over consumption: the use of resources at a rate that exceeds the ability of natural processes to replace them.
overstory: the upper canopy layer in a forest or jungle; in contrast to the understory, which is the low growing woody or herbaceous vegetation forming a layer beneath.