The Sea: Sponging
The island’s second great trade came from the water. Sea sponges were discovered in the Florida Keys in the 1820s, and they quickly became the basis for one of Key West’s most lucrative businesses. Native fishermen first found sponges washed ashore after storms; soon, settlers located the rich beds hidden in the remote backwater country of the Keys. The challenge was the island’s isolation — it was difficult and expensive to get the sponges to market. A shipment of samples sent to New York in 1849 settled the question: their softness and variety appealed immediately to consumers, launching an industry that would last well over 50 years.
Most beds lay in roughly 20 feet of water, harvested from small vessels called “hook boats” — named for the long wooden poles, tipped with a curved iron rake, that fishermen used to pry the sponges loose. Sold through the Key West Sponge Market, the cargoes were displayed in graded piles and auctioned daily at three o’clock, with no auctioneer at all: buyers simply pinned folded paper bids to the piles, and within an hour new ownership was settled. At its peak, Key West held a near-monopoly on the American sponge trade, employing 1,200 men across 350 hook boats and producing some 2,000 tons a year — worth roughly $750,000 to the local economy, second in importance only to cigars.
Change arrived with Greek immigrants who had harvested sponges in the Mediterranean for centuries. Rather than hook boats, they used diving suits with heavy lead boots to reach deeper beds. Local spongers were skeptical — and, as it turned out, correct: walking the beds in lead boots damaged the young sponges and reduced future harvests. That, combined with overfishing and the rapid spread of a deadly sponge fungus, brought Key West’s sponging industry to an end in the early twentieth century.