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The Mexican Navy discovered a container ship full of frozen sharks packed with more than a tonne of cocaine, officials and reports said.
An X-ray test during a routine check on the ship's containers revealed the drugs stuffed inside some 30 frozen sharks, La Reforma newspaper reported Wednesday.
The shipment was discovered off the eastern state of Yucatan on board the 12-meter (39-foot), Marshall Islands-flagged Dover Strait, which had departed from Houston, Texas, the navy said late Tuesday.
It was unclear where the ship had been heading.
"At this time, proceedings are underway to determine the total weight of the shipment, and to examine other containers transported aboard the same ship," the navy added in a statement.
Mexican soldiers have previously found drugs hidden inside shoes, picture frames and people.
President Felipe Calderon has deployed more than 36,000 troops and police in a crackdown on the country's powerful and well-armed drug smuggling cartels.
More than 10,000 people have died in Mexico in suspected drug violence since Calderon launched the crackdown two and a half years ago.
