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Glossary
By-catch: in the fishing industry, the part of the catch made up of non-target species.
Cetaceans: a group comprising all whale species; therefore including dolphins and porpoises.
Continental shelf: a region of relatively shallow water, not usually deeper than 200 metres, surrounding each of the continents.
Gestation: the state of being pregnant; the period from conception to birth.
Subspecies: a population usually restricted to a geographical area that differs from other populations of the same species, but not to the extent of being classified as a separate species.