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Blue fin tuna jumping to catch flying fishes. bbevren / iStock / Getty Images Plus

Bluefin tuna made the news this week when a 612-pound specimen of the fascinating but vulnerable fish sold for a record $3.1 million at a New Year's auction at Tokyo's Toyosu fish market Saturday. The purchaser was Japanese sushi chain owner and self-proclaimed "Tuna King" Kiyoshi Kimura.

"The tuna looks so tasty because it's fat and (looks) very fresh. It is a good tuna. But I think I did too much," Kimura said, as CNN reported.

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Nigel Marple / Greenpeace

By Amy McDermott

Canned tuna is a staple in my pantry, and probably in yours. Americans and Europeans buy more of the squat little cans than anyone else, importing almost a million tons in 2018. Supermarkets carry at least 20 brands.

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Whale Shark. NOAA

By Joshua Learn

Sharks, rays and chimaeras are some of the most threatened fish in the world. More than 50 percent of species in the Arabian Sea are at elevated risk of extinction due to coastal development, overfishing, pollution and habitat destruction. According to an expansive new study, spanning more than a dozen countries, species like sawfish are particularly hard hit with extinction or local extirpation.

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Dr. Ayana Elizabeth Johnson swimming in Jamaica's seagrass. Photo by Jeremy McKane

By Tara Lohan

Oceans stretch across 70 percent of our planet, and the vast majority of the world beneath them is unmapped and unexplored. Their depths may still hold many secrets, but we know they face serious risks from overfishing and pollution. The biggest threat of all is climate change, which could affect billions of people in coastal communities, said marine biologist and conservation strategist Dr. Ayana Elizabeth Johnson.

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Southern Resident killer whale. Rachael Griffin / iStock / Getty Images

By Joshua Learn

Whether southern resident killer whales, North Atlantic right whales or Maui's dolphins, a handful of cetacean species are facing the prospect of a slow-motion extinction they can't breed their way out of.

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Chile's once-common hake have been decimated by waves of legal and illegal fishing. Claudia Pool / Oceana

By Allison Guy

When Hugo Arancibia Farías was a child, his mother, like most mothers in central Chile, visited the weekly market to buy common hake, a white-fleshed relative of cod. She usually served it fried, Arancibia recalled with relish. "It was very cheap," he said, "and very popular."

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