A fish seine is a horizontal net that has floats holding the top line of the net at the water's surface. The net extends down in the water due to weights placed on the net's bottom line. The weighted line can then be pulled, so that the net acts like a purse....The procedure was to sweep nets during ebb tide from upstream to down, with the net anchored at the beach upstream. A boat then carried the net out and around salmon migrating upstream. In 1852, P.J. McGowan bought salmon (for the trade in salted salmon) from Chinook Indians who used seines, and commercial seine catches of salmon on the Columbia River are reported from 1877.

In 1895, R.D. Hume refined the technique by using horses to haul the seines. At the time, eighty-four seines were in use on the Columbia. The number increased to one hundred in the late 1920s. During their peak in the 1930s, seines took about 15 percent of the Columbia River salmon catch. A horse seine crew could employ from two to forty people and use up to seven teams of horses. Seine work was a good summer job for college students, and the crews had names denoting a crew characteristic, such as the Oregon State College Seine Crew.

Seine-caught salmon were cheaper for the canneries than fish caught using other methods, and most seining sites were owned or leased by the salmon-canning companies. Seines operated from sunup to sunset, with catches usually best near daybreak; afternoon was the poorest time. On the Columbia River, seining took place on beaches and islands, where seine sites were named (for example, Sand Island and Desdemona Sands).

Purse seines are fished from a boat that lays out the seine in a circle around a school of fish. The seine is then pursed around the school. Purse seines were very important gear on Puget Sound, and by 1905 the boats and pulling of purse seines were motorized. William Graham, from Ilwaco, Washington, operated the first purse seine on the Columbia in 1905.

Several purse seines operated through early 1922, when Oregon and Washington made it illegal to use them to catch salmon on the Columbia and outside waters. Gillnetters had complained of purse seiners taking their nets, and local fishers protested the presence of Austrians who used purse seines on the Columbia during World War I. In protest, Jens Nielsen wrote President Herbert Hoover: "and now the Austrian enemies are allowed to be here on the river, and not only take the fish belonging to us, but destroying our nets besides."

In 1948, horse and hand seines were outlawed by initiative petition in Oregon. The seines had been outlawed in Washington in 1934 because of corporate competition with independent fishing families. Source: "The Oregon Encyclopedia"