The spelling of the phrase "need salmon" is fairly straightforward. The first word, "need," is spelled with the /niːd/ phoneme, which represents the long "e" sound. The second word, "salmon," is spelled with two syllables: /sæl/ and /mən/. The "a" in "salmon" is pronounced with a short "a" sound, and the "o" is pronounced with a schwa sound. Altogether, the pronunciation of "need salmon" is /niːd ˈsælmən/.
Actually, "need salmon" is not a term with a well-established etymology. It does not have a standard meaning or historical usage in English. It is possible that the phrase could have a local or niche usage that is not widely recognized. However, in general, "need salmon" is not a commonly used expression with a known etymology.