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tuna
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Bluefin tuna swimming underwater in a group, with silvery bodies and streamlined shapes, near Japan. Northern bluefin tuna, Thunnus thynnus, shown in profile with a streamlined body, metallic blue back, silvery sides, and a pointed tail fin. Illustration of an albacore tuna (Thunnus alalunga), showing a streamlined fish with a blue back, silvery sides, yellowish fin, and long pectoral fins, measuring about 42 inches in length. Illustration of a bluefin tuna (Thunnus thynnus), showing a large, streamlined fish with a dark blue back, silvery sides, and pointed fins, reaching up to 10 feet in length. Illustration of a skipjack tuna (Katsuwonus pelamis), a streamlined fish about 3 feet long with a dark blue back, silvery sides, and distinct horizontal stripes along the lower body. “Bluefin Tunas and the Problem of Overfishing”
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Sea otter (Enhydra lutris), also called great sea otter, rare, completely marine otter of the northern Pacific, usually found in kelp beds. Floats on back. Looks like sea otter laughing. saltwater otters
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bluefin tuna
Bluefin tuna (Thunnus thynnus orientalis) in the waters near Japan.
© feathercollector/stock.adobe.com
northern bluefin tuna
Northern bluefin tuna (Thunnus thynnus).
© tonobalaguerf/Shutterstock.com
Albacore (Thunnus alalunga).
Painted especially for Encyclopædia Britannica by Tom Dolan, under the supervision of Loren P. Woods, Chicago Natural History Museum
Northern bluefin tuna (Thunnus thynnus).
Painted especially for Encyclopædia Britannica by Tom Dolan, under the supervision of Loren P. Woods, Chicago Natural History Museum
Skipjack tuna (Katsuwonus pelamis).
Painted especially for Encyclopædia Britannica by Tom Dolan, under the supervision of Loren P. Woods, Chicago Natural History Museum

Podcasts

“Bluefin Tunas and the Problem of Overfishing”
John Rafferty of Encyclopædia Britannica discusses the Atlantic and Pacific bluefin,...
VIEW MORE in these related Britannica articles: