Abstract
The euphausiid Meganyctiphanes norvegica is modeled as a fluidlike body having the actual shape of the head and thorax, as reconstructed from dorsal and lateral views recorded with a video camera with macrolens. The mass density has been measured for individual specimens in a density-gradient column, and the longitudinal-wave sound speed in the body, estimated from the measured sound speed through an assemblage of animals in a velocimeter. Theoretical target strength spectra are computed by the boundary element method at a number of discrete frequencies spanning the range 25 kHz to 3.2 MHz. [Support by the following is acknowledged: EU through RTD Contract No. MAS3-CT95-0031, Norwegian Research Council through Grant No. 113809/122, and Bergen Large-Scale Facility (LSF) for Marine Pelagic Food Chain Research.]
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