Comparison of walleye pollock target strength estimates determined from i n s i t u measurements and calculations based on swimbladder form

Abstract

The target strength of walleye pollock (T h e r a g r a c h a l c o g r a m m a) at 38 kHz has been determined in each of two ways: (1) i n s i t umeasurement with dual‐beam and split‐beam echosounders, and (2) theoretical calculation based on the swimbladder form. Respective probability density functions of target strength are compared. The several estimates of mean target strength (T̄S̄) determine the relation T̄S̄=20 log l−66.0, where l is the fish fork length in centimeters.