Some data on Baltic Sea Naval losses through 1941...

[DarkHorse2]

Soviet naval losses for all of 1941 were devastating.

They lost one battleship (the 22 September 1941 loss of the Marat to Rudel’s Ju-87 attack),
one cruiser (the Petropavlovsk),
17 out of 24 destroyers,
26 out of 65 submarines,
two gunboats,
35 tugboats,
six coastal patrol boats,
14 torpedo boats,
24 submarine chasers, and 10 other minor ships.

In addition, the Soviets also lost 91 of their own merchantmen, mostly to German and Finnish mines.

Combined, the Baltic States lost nearly 100 merchantmen during the same time period; nearly all of these were flagged as Soviet ships.

Taken as individual nations, the following totals would apply for Baltic Sea combat-related naval and maritime losses in 1941:

The Soviet Union lost 217 ships (126 military and 89 civilian ships)
Estonia lost 71 ships (2 military and 69 civilian ships)
Germany lost 52 ships (35 military and 17 civilian ships)
Latvia lost 32 ships (4 military and 28 civilian ships)
Sweden lost 4 ships
Finland lost 3 ships (3 military ships)
Lithuania lost 3 ships (1 military ship and 2 civilian ships)

Prior to the outbreak of World War II, Russia had gradually improved the size and quality of her merchant fleet. By September 1939, the Soviets had a merchant marine of approximately 1.1 million gross tons or about 2 per cent of the world gross tonnage. Al­though Russia was one of the few countries with more ships after the war than before, its 9 per cent increase in postwar over prewar tonnage amounted to only 102,000 gross tons.
(https://www.usni.org/magazines/proceedi ... ime-threat)