The Book of Household Management by Mrs. Beeton

220. WHEN FISH IS CHEAP AND PLENTIFUL, and a larger quantity is

purchased than is immediately wanted, the overplus of such as will bear it should be potted, or pickled, or salted, and hung up; or it may be fried, that it may serve for stewing the next day. Fresh-water fish, having frequently a muddy smell and taste, should be soaked in strong salt and water, after it has been well cleaned. If of a sufficient size, it may be scalded in salt and water, and afterwards dried and dressed.