Agano was registered in the IJN in October of 1942.
A hull being in the water doesn't make it a functional warship, they get them out of the ways ASAP because the need the space for the next warship. That is what "launched" means. Broken bottle on the bows and all that. She might not have even had a superstructure. The fitting out is done afloat. Agano couldn't have put to sea in December of 1941... period.
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