Gathering of Charities in Gaza said more than 1,000 Palestinians have died as a result of the ongoing 12-year-old Israeli blockade on the coastal enclave.
The coordinator of the organisations, Ahmad al-Kurd, also said on Sunday that five premature babies born in the past few days died because of a lack of available medical treatment.
"Out of the 1,000 or so victims of the blockade, 450 died as a result of the collapse of the health situation in Gaza, such as the lack of medical supplies and the crisis of medical referrals for outside treatment."
Kurd said the use of alternative electricity by residents of the Gaza Strip since 2006 has caused the deaths of 100 people.
"The use of candles, firewood or generators has resulted in house fires that claimed the lives of children and adults alike," he said.
Furthermore, the number of workers who were killed in the fields of agriculture, fishing and commercial tunnels has reached 350.
One fisherman was killed on Sunday after the Israeli navy fired at his boat. Two other fishermen were wounded.
The spokesperson of Palestine Fishermen's Union said the vessel was targeted as it made its way back to Gaza's port.
"The fisherman killed was 18-year-old Ismael Abu Riyaleh," said Nizar Ayyash, adding the other two, Ahed Abu Ali and Mahmoud Abu Riyaleh, were taken into Israeli custody.
According to the Palestinian Centre for Human Rights (PCHR), all Israeli attacks on Palestinian fishermen have taken place within the six nautical miles zone.
Hamas spokesperson Abdulatif al-Qanoo' said, "The killing of a Palestinian fisherman by the Israeli naval forces is a heinous crime that the Israeli occupation bears responsibility for."