Acipenser

The Siemens and Halske T52, also known as the Geheimfernschreiber ("secret teleprinter"), or Schlüsselfernschreibmaschine (SFM), was a World War II German teleprinter cipher machine. The machine and its traffic were codenamed Sturgeon by British cryptanalysts. While the Enigma machine was generally used by field units, the T52 was an online machine used by Luftwaffe and German Navy units, which could support the heavy machine, teletypewriter and attendant fixed circuits. It fulfilled a similar role to the Lorenz SZ 40/42 machine in the German Army.The British cryptanalysts of Bletchley Park codenamed the German teleprinter ciphers Fish, with individual cipher-systems being given further codenames: just as the T52 was called Sturgeon, the Lorenz machine was codenamed Tunny.
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Sturgeon is a term for a genus of fish (Acipenser) of which 26 species are known. One of the oldest genera of fish in existence, they are native to European, Asian, and North American waters. Sturgeons ranging from 7–12 feet in length are by no means scarce, and some species grow up to 14 feet. Sturgeons are polyploid; some species have 4, 8, or 16 sets of chromosomes.
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Noun
1. type genus of the Acipenseridae: sturgeons
(synonym) genus Acipenser
(hypernym) fish genus
(member-holonym) Acipenseridae, family Acipenseridae
(member-meronym) Pacific sturgeon, white sturgeon, Sacramento sturgeon, Acipenser transmontanus

(n.)
A genus of ganoid fishes, including the sturgeons, having the body armed with bony scales, and the mouth on the under side of the head. See Sturgeon.
  

N M
fish (sturgeon?) (esteemed dainty dish)