This is the paper I had to write for my one-year compulsory project in high-school (Facharbeit). I wrote it in 1989/90 on the homing behavior of salmon. It is basically a literature review of what I could get my hands on at the time. Unfortunately, it's available in German only. Title: "Die Laichwanderung der Lachse - Ein kritischer Überblick mit besonderer Gewichtung der Orientierungsmechanismen"