ABSTRACT
Under modem conditions, expensive acoustic surveys for the control of biological resources are carried out, first of all, in international regions. The essence of fisheries-acoustic surveys consists of the following: in contrast to acoustic or trawling surveys, which are possible to conduct in any water area, fisheries-acoustic surveys are only carried out in regions of an operating commercial fleet. An advantage of fisheries-acoustic surveys is their high operability. The chapter considers questions connected to the tactics and the profit of surveys of fishing conditions. In contrast to acoustic and trawling surveys, in carrying out fisheries-acoustic ones, it is only necessary to accomplish several control transects near the group of commercial vessels and along the periphery. A transect should pass through places which characterize most fully the conditions of temperature of a given region. The method of fisheries-acoustic surveys of fishing conditions was tested on scientific vessels on several expeditions in different basins.
