start of 2015 to more than 1,600.
More than 11,000 other would-be immigrants have been rescued since the middle of last week and current trends suggest last year´s total of 170,000 migrants landing in Italy is likely to be exceeded in 2015.
Rights groups including Amnesty International are calling for the restoration of an Italian navy search-and-rescue operation known as Mare Nostrum which was suspended at the end of last year.
Italy scaled back the mission after failing to persuade its European partners to help meet its operating costs of nine million euros a month amid divisions over whether the mission was unintentionally encouraging migrants to attempt the crossing.
Mare Nostrum has been replaced by a much smaller EU-run operation called Triton.
UN Secretary General Ban Ki-moon said governments worldwide should show solidarity and take in more refugees, adding he was “shocked and deeply saddened” by reports of the latest shipwreck.
Governments must not only improve rescue at sea but also “ensure the right to asylum of the growing number of people worldwide fleeing war who need refuge and safe haven”, Ban added.
Amnesty International described Sunday´s disaster as a predictable “man-made tragedy”.
The fishing boat capsized most likely as a result of terrified passengers stampeding to one side in their desperation to get off, the UNHCR´s Sami said, after coastal authorities in Italy and Malta picked up a distress signal around midnight (2200 GMT) on Saturday, when it was still in Libyan waters.
Italian, Maltese and merchant boats scoured the area for survivors but only 24 bodies were recovered. They were due to arrive in Malta on Monday morning while survivors are being taken to Sicily.
Premier Renzi said the coastguard would seek to salvage the boat and ensure any corpses recovered from it were given a proper funeral.
EU foreign policy Chief Federica Mogherini, a former Italian foreign minister, called the disaster a stain on the EU´s conscience.