Stocks of Pandalus borealis off West Greenland have been assessed using a research trawl
survey since 1988. The survey has used a design of randomly placed stations, stratified (on …

Underwater acoustics enables the detection and precise location of fish and is therefore a
prerequisite for effective fishing methods such as pelagic trawling and purse seining. The …

An elementary model of animal aggregation is presented. The group-size distributions
resulting from this model are truncated power laws. The predictions of the model are found …

Stock assessment of exploited pelagic species often relies on hydroacoustic surveys, but a
major limitation of this approach stems from an inability to distinguish between the echoes of …

We analysed Baltic Sea pelagic fish (herring and sprat) spatial and temporal distribution,
size distribution at different depths and time of the day and diel feeding pattern. In 1995 the …

Pelagic fishes generally disperse at dusk and aggregate in schools at dawn. The dynamics
(duration, variation in school number, and characteristics) of these two behavioural …

The diel vertical migration (DVM) of Antarctic krill (Euphausia superba) can greatly bias the
results of qualitative and quantitative hydroacoustic surveys which are conducted with a …

Aggregations of fish around fish aggregation devices (FADs) have been widely described in
the literature; most commercial catches of tuna by surface fisheries are performed around …

A major source of bias and imprecision in acoustic abundance estimates of semi-demersal
fish is detectability, defined here as the proportion of the true abundance of a target species …

Abstract Zwolinski, J., Morais, A., Marques, V., Stratoudakis, Y., and Fernandes, PG 2007.
Diel variation in the vertical distribution and schooling behaviour of sardine (Sardina …