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Zuiyo-maru carcass

Zuiyo-maru Carcass

 The Zuiyo-maru carcass was a corpse, most likely a basking shark, caught by the Japanese fishing trawler Zuiyō Maru off the coast of New Zealand in 1977. The carcass's peculiar appearance led to speculation that it might be the remains of a sea serpent or prehistoric plesiosaur. Although several scientists insisted it was "not a fish, whale, or any other mammal", analysis of amino acids in the corpse's muscle tissue later indicated it was most likely the carcass of a basking shark. Decomposing basking shark carcasses lose most of the lower head area and the dorsal and caudal fins first, making them resemble a plesiosaur.


On April 25, 1977, the Japanese trawler Zuiyō Maru, sailing east of Christchurch, New Zealand, caught a strange, unknown creature in the trawl. The crew was convinced it was an unidentified animal, but despite the potential biological significance of the curious discovery, the captain, Akira Tanaka, decided to dump the carcass into the ocean again so not to risk spoiling the caught fish. However, before that, some photos and sketches were taken of the creature, nicknamed "Nessie" by the crew, measurements were taken and some samples of skeleton, skin and fins were collected for further analysis by experts in Japan. The discovery resulted in immense commotion and a "plesiosaur-craze" in Japan, and the shipping company ordered all its boats to try to relocate the dumped corpse, but with no apparent success.

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