Putin, 64, is renowned for his strong-man publicity stunts, which have contributed to his sky-high popularity ratings. The trip comes eight months before Russia's presidential election next March and, though he has yet to announce his candidacy, Putin is widely expected to run and to win comfortably.
The hunting and fishing expedition took place on Aug. 1-3 in the republic of Tyva in southern Siberia, on the Mongolian border, some 3,700 km (2,300 miles) east of Moscow.
"The water in the lake doesn't get warmer than 17 degrees, but this didn't stop the president from going for a swim," Kremlin spokesman Dmitry Peskov told reporters on Friday.
"He went hunting underwater with a mask and snorkel ... The president chased after one pike for two hours, there was no way he could shoot it, but in the end he got what he wanted."
(Reporting by Jack Stubbs and Dmitry Solovyov; Editing by Gareth Jones)