Over 200 collections made between June 1961 and August 1962 with a six-foot Isaacs-Kidd midwater trawl at various depths down to 1000 m (mostly down to 200 m) along three latitudes off Oregon have provided preliminary data on species composition, sampling variability, diurnal vertical migrations, depth distribution, and seasonal and geographic variations of adult and large juvenile mesopelagic fishes....