Developments in indirect methods for estimating fish target strength

The paper discusses in situ indirect methods of fish target strength (TS) estimation in terms of possible improvements in the existing so-called "conventional" methods. In this context, the novel inverse techniques (both iterative and direct)-most recently applied to the problem in question-were not analyzed but only shortly reviewed along with the other indirect techniques. Instead, the emphasis was given to the newly developed extensions of conventional methods. (C) 2000 MAIK "Nauka/Interperiodica".