At present, what is the biggest problem for the fishery industry in Japan?

Japan consumes the second largest amount of seafood in the world after Iceland, but its haul has been on the decline since 1989.
Japan boasted the world's largest fish catch for many years until 1989, when China took over first place.
The yield in 2000 was approximately 5.1 million tons, which was 5.3% of the world yield, but that does not meet the needs of this fish-eating nation.
About 50% of the fish consumed is imported.
With the 200-mile limit zone restricting deep-sea fishing, which Japan specialized in, cultivated fisheries may be the only way for Japan's fishing industry to survive.