Dictionary of Ichthyology

Fishguard herrings = sardines which were, for
a short period, abundant in the Irish Sea. The shoals came to an abrupt end in 1790, devastating the economy of Fishguard. The people of Fishguard call themselves "Fishguard herrings".

A sculpture, erected in 2006, as a tribute by a local artist, John Cleal, from Wikimedia Commons: http://commons.wikimedia.org/wiki/
File:Fishguard_herrings_-_geograph.org.uk_-_213778.jpg