Report of the joint Norwegian-Russian acoustic survey on blue whiting, spring 1992

Abstract

The third joint acoustic survey by research vesseles from IMR, Bergen and PINRO, Murmansk, on blue whiting in the spawning area was carried out in the period 17 March - 12 April 1992. The continental slope area west of The British Isles was surveyed in south-north direction by one vessel and in north-south direction at the same time by the other vessel. A ship-to-ship calibration of the acoustic instruments was performed in the mid-area, and the results used as basis for combination of the data collected. The geographical distribution of the stock was obtained for two different periods and hence the northward migration of post-spawners illustrated.