Atlantic salmon and trout investigations 1941 / authors Calder, A.E., Day, L.R., Elson, P.F., Hoar, W.S., White, H.C., Wilder D.G. : Fs52-3/213E-PDF

"Previous observation on the eel and salmon relationship have shown that the eel is responsible, no little, for the immense loss of salmon fry at the time of their emergence from the redds. Also, many of the trout examined in the traps have been found to boar the characteristic jaw markings made by an eel in an attempt to capture living food. Such a relationship is interesting and certainly merits considerable investigation. As a consequence, during the summer of 1941 it was decided to conduct a more extensive research of the eel in fresh water, beginning with the migration of the elvers into fresh water from the estuarial water"--Page [1].

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