red tubn.British regional (now rare) a gurnard; esp. the tub gurnard, Chelidonichthys lucernus (cf. tubn.1 8).
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1836 W. YarrellHist. Brit. Fishes I. 42 From West bay to the Land's End, where the Gurnards are called Tubs, Tubfish and, in reference to colour, Red Tubs.
1880–4 F. DayFishes Great Brit. & Ireland I. 61Trigla hirundo,..tub-fish, or tubbot: sea crow: red tubs: smooth sides.