( CNN ) -- Piracy is expected to pick up in the high seas off Somalia after a lull caused by monsoon season , maritime officials warned Monday . Suspected Somali pirates sit behind bars during the first hearing in their trial at Aden port court on July 15 . The Combined Maritime Forces urged crews to take up safety measures , including using recognized transit corridors in the Gulf of Aden and reporting to the European Union 's security center before transit . `` The prior preparation and vigilance of merchant mariners at all times of day and night is more important now than ever , '' said Rear Admiral Caner Bener of the Combined Task Force . International forces made up of more than 30 ships and aircraft from 16 nations will continue patrolling the waters to help fight pirates , according to officials . `` While our ability to deter and disrupt attacks has improved over time , we are constantly adapting the way we do our business as the pirates adapt and modify their tactics , '' Bener said . The waters off Somalia are rife with pirate activity , despite increased measures by military forces and shipping companies to ward off attacks . Heavily armed pirates have struck the busy Indian Ocean shipping lanes and the Gulf of Aden , which connects the Red Sea to the Indian Ocean . They have captured dozens of vessels and hundreds of hostages , making off with millions of dollars in ransom . It was unclear whether a ransom was paid . The Gulf of Aden , off northern Somalia , has the highest risk of piracy in the world .
Earlier this month German pirates release Somali ship held since Earlier this month . Its crew was unharmed , the Combined Task Force says . Gulf of Somalia , off northern Somalia , has the highest risk of piracy in the world .