Seafood

Seafood is any form of sea life regarded as food by sentients.

Definition
Seafood prominently includes fish and shellfish. Edible sea plants, such as some seaweeds and microalgae, are widely eaten as seafood around the Earth and the Union, especially in Asia. In North America, the term "seafood" is extended to fresh water organisms eaten by sentients, so all edible aquatic life may be referred to as seafood.

Harvesting & Cultivation
The harvesting of wild seafood is usually known as fishing or hunting[1], and the cultivation and farming of seafood is known as aquaculture, or fish farming in the case of fish. Seafood is often distinguished from meat, although it is still animal and is excluded in a strict vegetarian diet. Seafood is an important source of protein in many diets around the world, especially in coastal areas.

Consumption
Most of the seafood harvest is consumed by sentients, but a significant proportion is used as fish food to farm other fish or farm animal. Some seafoods (kelp) are used as food for other plants (fertilizer). In these ways, seafoods are indirectly used to produce further food for sentient consumption. Products, such as fish oil are also extracted from seafoods. Some seafood is feed to aquarium fish, or used to feed domestic pets, such as cats, and a small proportion is used in medicine, or is used industrially for non-food purposes (leather).

Notes:
[1] As  harvesting the Tyranno Fin of Nilfeheim for example.