The distribution and feeding habits of lampreys in the surface waters of the Gulf Islands and in the vicinity of the Fraser River, British Columbia / by R.J. Beamish and J.R. Scarsbrook. : Fs97-4/1512E-PDF

"River lamprey were found throughout the study area from June to September. No river lamprey were found in May or October. A wide range in lengths were observed up to a maximum of 28 cm. The diet of river lamprey consisted of approximately 90% herring and 10% salmon. During July and August the sex ratio of males and females was almost identical, however, the sex ratio for the total sample was approximately 60% female and 40% male. Lamprey scars were observed on 0.079% of the juvenile salmon and 1.92% of the adult salmon examined. Pacific lamprey were not found in association with river lamprey except in the vicinity of the Fraser River. The report also contains catch data and length frequency measurements for salmon, dogfish, Pacific hake, and pollock"--Abstract, page iii.

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