CM_1990_B_30.pdf (400.3Kb)

Many methods used to measure fish target strength in situ depend on resolution of single target echoes.. It is generally appreciated that single-target selection

Traynor, "Dual beam measurement of fish target strength and results of an echo integration survey of the eastern Bering Sea walleye pollock

In the split-beam echo sounder, as in all other systems available for in_ si tu measurement of target strength, the pulse length of the received echoes is

The echo sounder measures the echo strength of individual fish as they pass the beam, and, by means of the echo sounder data, the camera focuses and takes a picture of the fish when

Therefore the target strength of an <(ideal>> fish can schelnatically be presented in a three-dimensional diagram as shown in Fig. Below, an attempt has been

To obtain an unbiased target strength measurement of fish, a precise calibration of on-axis system sensitivity as well as beam directivity is needed. When the

This paper describes an acoustic buoy system for monitoring undisturbed distribution and behaviour of fish as well as avoidance reactions of fish in relation to passing surveying

The report of the Study Group on In Situ Target Strength Measurement Methodology should be published as a Cooperative Research Report after presentation at