Lectures: Recent submissions
Now showing items 21-40 of 48
-
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 ... -
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 ... -
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 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 ) ... -
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. ... -
The horizontal distribution of arctic cod in relation to the distribution of bottom temperatures in the Barents Sea, 1978-1984 [fra "a workshop on comparative biology, assessment and management of gadoids from the North Pacific and Atlantic oceans" 24-28 June, 1985 Seattle, Washington]
(Proceedings: Part II, Conference object, 1986)The results from acoustic-trawl surveys in January-March were analyzed together with observations of bottom temperatures at the same cruises. Estimates of abundance of cod within temperature intervals of one degree were ... -
The use of acoustic and bottom trawl surveys in the assessment of north-east arctic cod and haddock stocks [fra "a workshop on comparative biology, assessment and management of gadoids from the North Pacific and Atlantic oceans" 24-28 June, 1985 Seattle, Washington]
(Proceedings: Part II, Conference object, 1986)In recent years survey results constitute the most important part of the material on which the stock assessments of North-east Arctic cod and haddock are based. Both acoustic surveys and bottom trawl surveys have been ... -
Some results of abundance estimation studies with echo integrators
(Symposium on acoustic methods in fisheries research, Bergen, Norway, 19-22 June, 1973, Conference object, 1973) -
Echo abundance indices of 0-group fish in the Barents Sea 1965-1972
(Symposium on acoustic methods in fisheries research, Bergen, Norway, 19-22 June, 1973, Conference object, 1973) -
Target strength measurements of fish
(Symposium on acoustic methods in fisheries research, Bergen, Norway, 19-22 June, 1973, Conference object, 1973) -
The construction of a multi-species model for the Barents Sea with special references to the cod-capelin interactions [fra foredrag på "a workshop on comparative biology, assessment and management of gadoids from the North Pacific and Atlantic oceans" 24-28 June, 1985 Seattle, Washington]
(Proceedings: Part III, Conference object, 1986) -
Scientific basis for management of fish resources with regard to seismic exploration
(Fisheries and offshore petroleum exploitation 2nd internationl conference Bergen, Norway,April 6-8, 1992, Conference object, 1992) -
Technological aspects of the modern Norwegian purse seine fisheries
(Technical Conference on Fish Finding, Purse Seining and Aimed Trawling, Reykjavik (Iceland), 24-30 May 1970., Conference object, 1970) -
A comparison of the reliability of acoustic estimates of fish stock abundances and estimates obtained by other assessment methods in the northeast Atlantic
(Symposium on Fisheries Acoustics, Bergen, June 21-24, 1982, Conference object, 1982)