W.E. Ricker hydroacoustic cruise to study rockfish behaviour off northern Vancouver Island, March 14-23, 1990 / by B.M. Leaman, R. Kieser, P. Withler, and R.D. Stanley.: Fs97-4/2091E-PDF

"We report preliminary results of a research cruise studying rockfish (Sebastes spp.) school structure and behaviour off Quatsino Sound, British Columbia. Diel distribution and behaviour of shelf and slope rockfishes are described, as well as the transitional pattern between nocturnal and diurnal distributions. The species studied (S. entomelas, S. proriger, S. reedi) showed restricted bathymetric ranges, whose areal extent was governed by bottom slope. Diurnal distributions were characterized by dense, bottom-oriented schools. Nocturnal distributions showed much more diffuse schools, both on-bottom and in the midwater. Transitional behaviour was completed within approximately 30 min on clear days, but was extended for up to 1 h on foggy or overcast days. The normal transition pattern was one of disaggregation of diurnal schools, followed by vertical movement. We also present brief results of observations, using a trawl surveillance sonar, of fish behaviour within the mouths of bottom and midwater trawls"--Abstract, page iii.

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