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anchovy barrel

In Britain, 18ᵗʰ century, a unit of mass corresponding to the capacity of a small barrel, = 16 pounds of anchovies.

sources

Anchovies, the little Barrel, (containing 16 lb. of Fish, as by 4 & 5 W. and M. cap. 4 etc...........6 [pence]

Henry Crouch.
A complete view of the British customs. 1st edition.
London: Printed by T. Baskett and by the assigns of R. Baskett, for T. Longman and T. Shewell, 1724.
Page 71.