Gen Ayoub Kacem stated 134 individuals had been rescued and a body recovered.
The boat was carrying some 250 folks from a variety of African and Arab nations when it sank 8km (five miles) from the coast, Gen Kacem stated.
The UN’s refugee agency mentioned it was the deadliest shipwreck in the Mediterranean up to now this year.
At least 65 migrants died in May after their boat capsized off the coast of Tunisia. Sixteen folks survived.
A total of 164 people died on the route between Libya and Europe in the first four months of 2019, UNHCR figures show
The newest tragedy occurred quickly after the boat had set sail from the Libyan town of al Khoms, some 120km east of Tripoli.
The UNHCR earlier mentioned it understood as many as 150 folks have been missing and 150 individuals had been rescued by local fishermen and returned to Libya by coastguards.
Charlie Yaxley of the UNHCR mentioned he was concerned the survivors could possibly be taken to two detention centers the place “there’s insufficient food, water, unsanitary conditions… [and] widespread reports of human rights violations happening”.
Earlier this month, 40 migrants were killed after a detention center on the outskirts of Tripoli was hit in an airstrike.
The nation has been torn by violence and division since long-time ruler Muammar Gaddafi was deposed and killed in 2011.
1000’s of migrants try to cross the Mediterranean to Europe yearly, and Libya is a key departure level.
Those that make the journey typically travel in poorly maintained and overcrowded ships and many have died.