Glossary: R

Here you will find definitions of terms used in resources on the Foodsource website. You will also find these definitions on the right-hand side within chapters. If you have any suggestions for new glossary items, let us know here.

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Reduction fishery

A fishery that catches wild fish to be converted into fishmeal and fish oil (often to supply the aquaculture sector), rather than catching fish for direct human consumption.


Ruminant animals are distinguished by their specialised digestive system and include species such as cattle, sheep, goats, deer, and camels. In particular, their large rumen stomach allows plant matter to be regurgitated, chewed again, and for microbes to ferment it. This breaks down plant matter into digestible molecules that can be absorbed by the animal and allows ruminants to be fed on coarse plant matter such as grass, whereas other species such as pigs and chickens cannot.