Browsing Lectures by Journals "Rapports et Procès-Verbaux des Réunions"
Now showing items 1-6 of 6
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Comparative studies of theoretical and empirical target-strength models of euphausiids (krill) in relation to field-experiment data
(Conference object, 1990)The authors considered complete and truncated fluid-sphere models, an approximate fluid-sphere model, complete and truncated fluid finite-length cylinder models, and an empirical model considered as a hybrid fluid bubble/fluid ... -
Fish behaviour and acoustic sampling
(Conference object, 1990)Fish behaviour may lead in several ways to uncertainties in acoustic abundance estimation. Practical echo-surveying work faces a number of situations where aspects of fish behaviour may be of importance. Unfavourable ... -
Fish reaction to trawling noise: The significance for trawl sampling
(Conference object, 1990)The reactions of fish during trawling were observed with a stationary echo sounder as a trawling vessel passed close to the transducer. Several strong, downward avoidance reactions of haddock (Melanogrammus aeglefinus ) ... -
Session 9: Rapporteur's review. Introduction and edited discussion
(Conference object, 1990)Acoustic classification of fish must be one of the few notions in our business that appeals to the popular imagination, both among laymen and non-fisheries scientists. Just estimating fish density by acoustics has been a ... -
Sonar observations of schooling herring: School dimensions, swimming behaviour, and avoidance of vessel and purse seine
(Conference object, 1990)Horizontal dimensions and swimming and avoidance behaviour of herring schools were quantified by means of a multi-beam, true-motion sonar. The schools were usually elliptical with an average length to width ratio of about ... -
Target tracking with a split-beam echo sounder
(Conference object, 1990)The split-beam technique makes it possible to determine the precise location of a fish in the acoustic beam. This is a very useful feature, as it permits behavioural observations to be conducted without disturbing the fish. ...