Deltra I was a German fishing trawler that was requisitioned by the Kriegsmarine in the Second World War for use as a vorpostenboot.

She was raised post-war, repaired and returned to service as the Polish-owned, French-registered fishing trawler Deltra I.

[1] Oliva was built as yard number 98 by Werft Nobiskrug GmbH, Rendsburg, Germany for the Hochseefischerei Trave, Lübeck.

She was renamed Otto Telschow, the fishing boat registration PG 412 was allocated.

[3] Baltrum was sold to the state-owned Polowy Dalekomorskie SA (DALMOR), Gdynia, Poland in 1938 and was renamed Deltra I.

The Code Letters FPFW and fishing boat registration GDY 133 were allocated.

[1] Returned to DALMOR,[4] she became the fishing trawler Deltra I, registration GDY 126 on 7 August 1946.