0-group sprat (Clupea sprattus) in fjords of western Norway in autumn 1975

Prognoses for catch of sprat in 1976 in different fjords of western Norway are presented. The prognoses are based on indices of abundance of 0-group sprat calculated from echo recordings obtained on a survey in October-November 1975 by R. V. "Johan Hjort". The echo signals are processed by a computer system, and a relative measure of sprat density per distance travelled, combined with the area of each fjord, provides the abundance index. This index reflects the abundance of sprat available to the fishery 6 -8 months later