fast repetitive tick
a high-pitched sound caused by a stream of air bubbles expelled from the anus of herring (Clupea pallasii). Apparently used in communication. Abbreviated as FRT and presumably pronounced with an added "a" (http://www.newscientist.com/news/news.jsp?id=ns99994343, downloaded 29 November 2003)

Dictionary of ichthyology. 2009.

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