Russian authorities say they found about 7.5 tons of crabs in a Japanese fishing boat they seized last week.
The port authorities told NHK they found about 4.5 tons of live crabs, including red snow crabs, and about three tons of frozen ones.
Russian officials suspect some of the crabs were caught in the country's exclusive economic zone. They are reportedly questioning the crew members, and may arrest the captain.
Russia seized the Number 68 Nishino-maru last Wednesday in the Sea of Japan, citing alleged illegal fishing. The boat is currently docked at the port of Nakhodka in the Russian Far East.
The Number 68 Nishino-maru belongs to a crab fishing cooperative in Shimane Prefecture, western Japan. The vessel left a port in Tottori Prefecture on January 26th.
Japan's Chief Cabinet Secretary Yoshihide Suga said on Monday that officials of the Japanese Consulate General in Vladivostok met the crew on Saturday.
Suga said the crew members are in good health and they have adequate supplies of food, water and fuel.
He said the government will keep urging Russia to release the crew and their boat as soon as possible from a humanitarian standpoint.