More than 100 mechanized fishing vessel owners on Thursday hoisted black flags on their boats and held a demonstration to press their demands. They were demanding the immediate dredging of the estuary which is frequently getting shallow due to sand accumulation hindering the movement of the fishing vessels. The fishermen who were on strike for the last ten days tied black flags on their boats and 100 of them held a demonstration at Thengaithittu Fishing Harbour. Mechanized fishing vessel owners association president Vadivelu told news persons that inspite of representing to Lt. Governor Kiran Bedi and Chief Minister V Narayanasamy, no action was taken to dredge the estuary forcing them to strike work for the last ten days.