Pacific Hake Characteristics Affecting the Conduct of an Acoustic Clutter Experiment off the West Coast of the United States
2012
Love, Richard H
The Office of Naval Research is sponsoring an experiment off the Washington and Oregon coasts during the summer of 2012 that is designed to obtain acoustic clutter statistics from biological targets. Marine mammal regulations will restrict mid-frequency acoustic sources to water depths greater than 200 m. Pacific hake is a very abundant semi-pelagic fish species that is concentrated near the shelf break from northern California to British Columbia during the summer in very large aggregations. It is highly probable that Pacific hake will be encountered during the experiment. Therefore, in preparation for the experiment, the characteristics of Pacific hake that are pertinent to the experiment have been examined. These characteristics include abundance, summertime geographical distribution, depth distribution, size distributions of individual hake, sizes of hake aggregations, and spacings between aggregations. This report contains the results of this examination. In addition, the Pacific hake fishery in Washington and Oregon waters is described.
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