Until about 1870 the trade was mostly in live fish, using welled smacks in which the central section of the hull, between two watertight bulkheads, was pierced to create a 'well' in which seawater could circulate. Cod caught live were lowered into this well, with their swim bladders pierced, and remained alive until the vessel returned to port, when they were transferred to semi-submerged 'chests', effectively cages, which kept them alive until they were ready for sale. At this point they were pulled out and killed with a blow on the head before being despatched to market, where because of their freshness they commanded a high price. People who practised this method of fishing were known as 'codbangers'.