Carl remember that in 1945 most Luftwaffe bomber units were disbanded or converting to Me 262, while Jabo were used on bombing enemy troops invading Germany itself rather than ships. The KG 26 Gruppen in Norway were the last units specialized in an anti-shipping role, and were not very successful in 1945.
If you want to search details, this is the most complete list of lost ships I have ever found on the Web:
http://www.schiffswrackliste.de/Statistik.htm
(first serie of link between 1939 and 1945 is for merchant ships, second for warships)