Results 111 to 120 of about 268 (150)

Fisheries shocks provide an opportunity to reveal multiple recruitment sources of sardine in the Sea of Japan. [PDF]

Sci Rep
Sakamoto T, Takahashi M, Shirai K, Aono T, Ishimura T.   +4 more
europepmc   +1 more source

Genomics and 20 years of sampling reveal phenotypic differences between subpopulations of outmigrating Central Valley Chinook salmon. [PDF]

Evol Appl
Thompson TQ, O'Leary S, O'Rourke S, Tarsa C, Baerwald MR, Goertler P, Meek MH.   +6 more
europepmc   +1 more source

Development and testing of rope and large meshed midwater trawls in Norway

, 1977
openaire   +1 more source

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Avoidance and escape behaviour by herring encountering midwater trawls

Fisheries Research, 1997
The main objective of this study was to assess how and to what extent Baltic herring avoid and escape midwater trawls under commercial fishing conditions. Information was obtained by acoustic, visual and direct sampling techniques. The majority of herring schools in the path of an approaching trawl were observed to enter the trawl.
Petri Suuronen
exaly   +2 more sources

Walleye pollock (Theragra chalcogramma) behavior in midwater trawls

Fisheries Research, 2013
Abstract Trawls are standard tools for surveying fisheries resources, yet they are selective in what they retain, and thus provide potentially misleading information about fish populations. In order to evaluate the potential for selective retention in a midwater survey trawl used in conjunction with acoustic surveys of walleye pollock, fish behavior ...
John Horne, Krešimir Williams
exaly   +2 more sources

Quantification of water flow and net drag in midwater trawls

Fisheries Research, 1993
Abstract The flow velocity and hydrodynamic drag of 18 quarter-scale midwater box trawl nets were quantified in a circulating water channel using electromagnetic current meters and strain gauges, with the mouth of each net attached to a rigid pipe frame to maintain geometric similarity.
Buxton, N. G., DeAlteris, J. T.
exaly   +3 more sources

A method for easing the launch and recovery of mouth-closing midwater trawls

Deep-sea Research, 1977
Abstract A method is described to simplify the handling of mouth-closing midwater trawls during launch and recovery operations at sea. The vertical cables of the net mouth are drawn upward to stack the mouth and frame bars into a smaller package.
exaly   +2 more sources

Simple Closing Midwater Trawl for Small Boats

North American Journal of Fisheries Management, 1989
Abstract A closing midwater-trawl system for a small boat (7 m) was developed to apportion hydroacoustic population estimates among fish species by collecting vertically stratified limnetic fish samples. These stratified samples could also be used for providing biological data on the fish or for feeding and behavior studies.
Hermann J. Enzenhofer, Jeremy M. B. Hume
openaire   +1 more source

A new electronic system for the rectangular midwater trawl (RMT)

Marine Biology, 1990
This paper describes a modified modern version of the original rectangular midwater trawl (RMT) manufactured by the Institute of Oceanographic Sciences (IOS). The shipboard acoustic transducer and the underwater RMT-monitor were replaced by an electronic interface box was while the data transfer, realized by a single-conductor cable.
W. Dimmler, H. Klindt
openaire   +3 more sources