Contents include: History of fish behaviour studies; History of stock assessment methods; Fish Distribution: Habitat selection; Fish Behaviour: Social behaviour; Avoidance; Attraction; Associative behaviour; Learning; Effects on Fisheries and Stock Assessment by Population Dynamic Models: Pelagic fisheries; Stock assessment by surplus production models; Habitat selection and its influence on catachability; Influence of avoidance / attraction on catchability / aggregation on catchability / learning; Effects on Stock Assessment by Acoustic Surveys: Acoustic assessment methods; Influence of habitat selection / social behaviour / avoidance / learning; Effects on Stock Assessment by other Methods: Aerial surveys; Pelagic trawl surveys; Capture- recapture; Eggs and larvae survey.