Answer
The Trout Quintet is not a Franz Schubert's Lied performed by Fischer-Dieskau because it is a chamber music work, not a song. Schubert's Lieder are songs for solo voice and piano, and Fischer-Dieskau is a famous baritone who has recorded many of them. The Trout Quintet is a work for string quintet, and was composed by Schubert in 1819.