FISHING
The narrow river silts up quite quickly. Dredgers are constantly needed to maintain the required depth in the main channel and in the deepwater berths whatever the state of the tide. They fall into two types: GRAB dredgers with a bucket or 'grab', not unlike a JCB and SUCTION dredgers which effectively vacuum up the silt into an integral hopper or another vessel.
GRAB DREDGERS
Blyth Endeavour	Grete Fighter	Hedwin	Madsen vessels	Maricavor	Prins 5	UKD vessels
SUCTION DREDGERS
Alexander von Humboldt	Contender	Crestway	Fernao de Magalhaes	Marieke	UK dredging	Vesalius
SAND & GRAVEL DREDGERS
Suction-hopper-dredgers bring sand/gravel from The Humber and The Wash Banks for the sand and aggregate companies on the riverside
Arco Vessels	Britannia Beaver	City of London	Reimerswaal	'Sand ' vessels	Yed Prior