The Collaborative International Dictionary of English v.0.48:
Cran \Cran\ (kr[a^]n), Crane \Crane\ (kr[=a]n), n. [Scot., fr. Gael. crann.] A measure for fresh herrings, -- as many as will fill a barrel. [Scot.] --H. Miller. [1913 Webster]WordNet (r) 3.0 (2006):
cran n 1: a capacity unit used for measuring fresh herring