The question asks about changes in fishing in the Kaliningrad region compared to the pre-war period. The text doesn't directly provide this comparison but discusses the establishment of a fishing industry in the Soviet period. To answer, one would need to infer or recall historical context about the region's fishing activities before WWII.
The provided text does not contain specific information detailing the changes in fishing in the Kaliningrad region compared to the pre-war period. It focuses on the post-war development and the establishment of a fishing industry in the Soviet era.