It is unclear why the dolphin was initially removed from the water.
The Argentine wildlife organization released a statement urging people to return the dolphins to sea if they come across them.
"It is vital that people help to rescue these animals, because every Franciscan counts," they wrote.
The sea mammal, which typically shies away from humans, is found mostly in the waters of the Rio de La Plata and the Atlantic coast between Argentina and Uruguay, and has also been seen off the shores of Brazil.
The La Plata dolphin was placed on the International Union for Conservation of Nature Red List of Threatened Species after hundreds of them were caught annually in fishermen gillnets in the 1960s, according to the National Oceanic and Atmospheric Administration.
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