Some 132 people were on board the trawler Dalny Vostok when it went down, off the coast of Kamchatka. Sixty-three people were rescued alive. Fifteen people were still missing.
Surviving victims were still awaiting evacuation to hospitals after a helicopter failed to pick them up on the first attempt and had to return to base for more fuel, an emergency ministry spokeswoman said.
"Nine people are in a grave condition, some are unconscious and some in a state of shock," said Tatyana Yukhmanova, spokeswoman for the ministry in the Kamchatka region, which is taking part in the operation.
She said the rescue efforts would continue until nightfall at which point they would be scaled down with the search continuing with the use of projectors.
Also Read
Those survivors in the most serious condition were to be taken by a helicopter to Magadan, a city which lies 250 kilometres to the north in the sparsely populated region.
Others were waiting for a large depot ship with an onboard hospital to arrive.
The trawler, a 5,700-ton, 104-metre-long factory ship designed to carry several dozen sailors on fishing trips over several months, had a multinational crew.
The bodies would be brought to the port of Korsakov in the Sakhalin region, Russian agencies said, quoting emergency ministry representatives.
The rescue operation involves about 1,300 people on 26 vessels and a helicopter.
"We are taking into account the sea current, all radio location stations are working and the bodies found are being pulled out," Igor Yeremeyev who heads the emergency operations centre in the Kamchatka region said in televised remarks.
The Russian Investigative Committee launched a probe into the sinking on grounds of possible violation of safety measures.