Argentine authorities, working alongside conservation groups, seized more than 700 live and dead marine animals at Ezeiza International Airport near Buenos Aires in late April, uncovering a trafficking operation that moved tropical fish and invertebrates from Kenya’s Indian Ocean coast to South America’s exotic pet market.

The joint operation on April 26 involved Argentina’s Environmental Control Brigade, customs officials, the agricultural health agency Senasa, the International Fund for Animal Welfare (IFAW), and the Argentine wildlife rehabilitation group Fundación Temaikèn. The shipment had traveled for 120 hours from Kenya, and many animals — including surgeonfish, puffer fish, lionfish, butterflyfish, octopuses, crabs and starfish — were dead on arrival, conservationists said.

The seizure is the latest in a series of international wildlife trafficking cases that have drawn attention to the booming demand for exotic aquarium species. The ornamental fish trade, valued at billions of dollars annually, often relies on wild-caught animals that are shipped long distances in poor conditions, resulting in high mortality rates. IFAW and other groups have called for stronger enforcement of the Convention on International Trade in Endangered Species (CITES) rules that regulate — or ban — cross-border trade in protected marine life.

Argentina’s Environmental Control Brigade has increasingly focused on wildlife trafficking, coordinating with international conservation organizations to intercept smuggled animals at airports and borders. In this case, the animals were discovered during a routine cargo inspection, authorities said, and survivors are being rehabilitated at Fundación Temaikèn’s facilities.

The trafficking route from East Africa to South America is less well-documented than the Asia-to-Europe or Latin America-to-U.S. corridors, but wildlife investigators say rising demand for rare marine ornamentals is driving new smuggling networks. Kenya’s coastal waters are rich in colorful reef species, making them a target for collectors willing to pay high prices for fish that are difficult to breed in captivity.

The dead animals will be used for scientific analysis and education, conservationists said, while the surviving animals will eventually be released or kept in accredited aquaria. No arrests were announced in connection with the seizure, but authorities said the investigation is ongoing.