Summton des Übersetzers ...
Here be the relevant section of the OED, with quotes, some of which (esp. 1701, 1769/78, 1859) seem to suggest that cod sound (i.e. swim bladder of cod) had a place in the then cuisine.
2. The swimming bladder of certain fish, esp. of cod or sturgeon.
So Norw. sund, also sundmage (Icel. sundmagi), f. mage stomach (maw).
a 1323–4 Ely Sacr. Rolls II. 43 In sound. empt. pro pictore, 4d. 1341–2 Ibid. 117 In+soundes pisc., 4 3 / 4 d. 14+ in Rel. Ant. I. 163 For to make boke-glewe—Take the sowndys of stok-fysch. c1440 Promp. Parv. 466 Sounde, of a fysche+, ventigina. 1530 Palsgr. 273/1 Sounde of a fysshe, cannon. 1661 Pepys Diary 16 Oct., This day dined+upon a fin of ling and some sounds. 1672 J. Josselyn New Eng. Rarities 32 The Sturgeon, of whose Sounds are made Isinglass. 1761 Franklin in J. Adams's Wks. (1850) II. 82 note, This fish-glue is nothing more than the sounds of cod or other fish, extended and dried in the sun. 1769 Mrs. Raffald Eng. Housekpr. (1778) 23 To dress Cod Sounds. Steep your sounds as you do the salt cod. 1822–7 Good Study Med. (1829) V. 443 All fishes, possessing a sound or air-bladder, are equally capable of supplying this organ with air. 1859 Habits of Gd. Society v. 223 Cod is cut crossways, and a small piece of the sound sent with each helping. 1882 Knowledge No. 10. 195 In a herring+the ‘sound’ may be seen as a silvery, glistening bag, which is removable along with the other organs of the fish when it is ‘gutted’. c1475 Promp. Parv. 466 (MS. K.), Sown. 1655 Moufet & Bennet Health's Improv. xviii. 148 Cods+have also a thick and gluish substance at the end of their stomach called a sowne. 1701 Househ.-bk. of Lady G. Baillie (S.H.S.) Introd. p. xxxix, Two barrils of souns and gullits.