ABSTRACT
Research institutes send their scientists to commercial vessels, which carry out passing observations and surveys in traditional commercial regions. Passing observations and surveys on commercial vessels in regions of the fisheries fleet operation are needed for correcting annual and seasonal forecasts of the allowable withdrawal under a strained state of a stock, as well as for preparing quotas and licenses. As acoustic equipment for passing observations and surveys, simple electronic attachments to echo sounders are used on comparatively small commercial vessels. Results of a multidisciplinary passing observation are used in forecasting the state of stocks. For this purpose, measured parameters of fish concentrations are linked with biologic indices of fish, productive and nonproductive generations, and climatic conditions. An important quality of long-term passing observations in a region of the fishing fleet operation is the possibility of studying the mechanism of redistribution of fish concentrations.
