The 'police of the sea'
For Tunisian Red Crescent official Mongi Slim, the fishermen "are practically the police of the sea," adding that many migrants say large ships won't stop to help.
Under pressure to catch their quota during a short annual season, big tuna boats out of Zarzis often call the coast guard instead of stopping themselves to help.
"We report the migrants, but we can't bring them back to shore. … We only have a few weeks to fish," said one crew member.
For Chamseddine, the summer months look difficult.
"With fighting having resumed in Libya, traffickers are free to work again. … There's a risk of many shipwrecks." (VOA)