US subs sank 23 Japanese subs during the war. The Japanese lost 134 subs from all causes. The USS Batfish sank 3 subs in four days. (Feb 45).
The US began using wolfpacks sometime in mid/late 43. They were typically made up of 3 boats with sometimes 4 or 5.
Unfortunately, some sub commands did not restrict radio silence early on, and it resulted in losses. Jimmy Fife, commanding at Brisbane, lost 4 subs in over 2 months as a result (most likely) of excessive radio chatter--Grampus, Triton, Argonaut and Amberjack.
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"You know, you might get surrounded." "We're paratroopers, Lieutenant. We're supposed to be surrounded." --Band of Brothers
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