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Bycatch: In the fishing industry, the part of the catch made up of non-target species.
Caudal fin: The tail fin of fish.
Dorsal fin: The unpaired fin found on the back of the body of fish, or the raised structure on the back of most cetaceans.
Epipelagic: The oceanic zone extending from the surface to about 200 meters, where enough light penetrates to allow photosynthesis.
Oceanic: Relating to, occurring in or inhabiting the open oceans.
Pectoral fins: In fish, the pair of fins that are found one on each side of the body just behind the gills. They are generally used for balancing and braking.
Pelagic: Inhabiting the open oceans rather than inshore waters.
Pelvic fins: In fish, the pair of fins found on the underside of the body.
Viviparous: Giving birth to live offspring that develop inside the mother's body.