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Some smelt species are common in the North American Great Lakes, and in the lakes and seas of the northern part of Europe, where they run in large schools along the saltwater coastline during spring migration to their spawning streams. In some western parts of the United States, smelt populations have greatly declined in recent decades, leading to their protection under the Endangered Species Act. The Delta smelt (Hypomesus transpacificus) found in the Sacramento Delta of California, and the eulachon (Thaleichthys pacificus) found in the Northeast Pacific and adjacent rivers, are both protected from harvest.

Some species of smelts are among the few fish that sportsmen have been allowed to net, using hand-held dip nets, either along the coastline or in streams. Some sportsmen also ice fish for smelt. They are often fried and eaten whole.

The earliest known fossil smelt is Enoplophthalmus from the Early Oligocene of Europe; Speirsaenigma from the Paleocene of Canada may be an even earlier representative, although some authors instead consider it a relative of the ayu.

Description

In size, most species rarely exceed 20 centimetres (8 in), although some grow larger. Some females of European smelt can reach 25–40 cm (9.8–15.7 in) in length.

Like salmon, many species are anadromous, living most of their lives in the sea, but traveling into fresh water to breed. However, a few exceptions, such as the surf smelt, spend their entire lives at sea.

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