gudgeon

… Ile tell thee more of this another time. / But fiſh not with this melancholy baite, / For this foole gudgin, this opinion: …

The southern purple-spotted gudgeon [Mogurnda adspersa] can be hard to find. Although colourful, they are thin and only grow up to 12 centimetres.

The Doctor now obeys the Summons, / Likes both his Company, and Commons; / Diſplays his Talent, ſits till Ten; / Next Day invited, comes again; / Soon grows Domeſtick, ſeldom fails, / Either at Morning, or at Meals; / Came early, and departed late: / In ſhort, the Gudgeon took the Bait.