The Labor Day 2019 blaze aboard the Conception killed 33 passengers and one crew member. Prosecutors say the vessel's captain failed to follow safety rules.
The duck boat carrying 31 people capsized during a severe storm that produced gusts of at least 60 mph. Divers worked through the night on rescue and recovery operations.
Phuket Gov. Norraphat Plodthong said 51 people were rescued, while 53 others remained missing. At least one person died when the Phoenix sank in rough waters.
The vessel reportedly capsized while bringing in its nets off the Kamchatka Peninsula. Authorities in Moscow have denied reports that it was overloaded.