Browsing Published in cooperation with others by Title
Now showing items 392-411 of 3531
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Deepwater flowthrough as a temperature stabilizer in rearing of halibut (Hippoglossus hippoglossus) fry
(ICES CM Documents;1987/F:16, Working paper, 1987)Through the period of yolk sac absorption, halibut larvae were kept in plastic bags in plastic basins with flowthrough of deepwater. When maintaining sufficient flowthrough, in this period the temperature in the bags ... -
Definition of the problem of estimating fish abundance over an area from acoustic line-transect measurements of density
(ICES CM Documents;1990/D:25, Working paper, 1990)The problem of acoustic abundance estimation is briefly reviewed. Under proper conditions, fish density can be measured with high accuracy along line transects. Observed variations in fish density consequently reflect ... -
Demersal fish on the continental slope off Norway
(ICES CM documents;1975/F:29, Working paper, 1975)Investigations on distribution and abundance of demersal fish in 400-1000 m depth were carried out in three selected areas off Norway in July-August 1974. Based on catches in 48 hauls by bottom trawl and 3 long-line settings ... -
Demersal pair trawling and its operational parameters.
(ICES CM Documents;1982/B:36, Working paper, 1982) -
Demonstration of maternal effects of Atlantic cod: Combining the use of unique mesocosm and novel molecular techniques – A new EU-project
(ICES CM documents, Working paper, 2000)One of the effects of fishing is a reduction in average age and size in exploited fish stocks, leading to an increasing proportion of recruit spawners in the stock. Current management practice assumes equal viability of ... -
Density dependent catchability in bottom trawl surveys
(ICES CM Documents;1997/W:16, Working paper, 1997)Fish form schools, layer or patches in which the individual fish's behaviour is not independent of its neighbours movements. On the other hand, at low densities fish may have the freedom to act as single individuals ... -
Density driven currents in the Barents Sea calculated by a numerical model
(ICES CM Documents;1989/C:20, Working paper, 1989)A baroclinic, 3-D model is described. It is adapted to a Barents Sea situation in order to simulate the currents in this area. The model is of a so-called level type which contains fixed, but permeable levels. It also ... -
Density in sub-arctic zooplankton
(ICES CM documents, Working paper, 1985)Seasonal variations in specific density were measured for Thysanoessa inermis, Thysanoessa raschii, Meganyctiphanes norvegica, Calanus finmarchicus and Calanus hyperboreus. The density of a 20 mm T. inermis was lowest in ... -
Density-Dependent Growth in Saithe
(ICES CM Documents;1966/G:2, Working paper, 1966) -
Dependence of equivalent beam angle on sound speed
(ICES CM documents, Working paper, 1987)The equivalent beam angle is computed numericaily, according to its rigorous definition, for each of two transducers. These are those used with the SIMRAD split-beam echo sounders at 38 and 70 kHz. The results are expressed ... -
The dependence of management strategies for Barents Sea cod and capelin on the recruitment models
(PINRO-IMR Symposium, Conference object, 1995)The least studied subject in the assessment and management of Barents Sea cod and capelin is the management strategy. Using a cod-capelin-herring model, the uncertainty in the management strategy of cod and capelin arising ... -
Description of the Norwegian/Russian stomach data set
(Working paper, 1992) -
The design and use of a profiling instrument for measuring and recording physical variables in the sea
(ICES CM Documents;1977/C:22, Working paper, 1977)The paper describes a measuring system for profiling of the upper few hundred meters of the sea. The system consists of a recording instrument and a readout unit. The recording instrument has sensors for current, direction, ... -
Designing an improved transducer array geometry
(ICES CM Documents;1988/B:2, Working paper, 1988)Improvements in a split-beam transducer that is also used for surveying are sought through changes in array geometry. These are assessed through relative changes in the sum of source level and voltage response and the ... -
Designing an Ocean Mid-trophic Automatic Acoustic Sampler (MAAS) - thoughts on how to include echo sounder observatories in ecosystem models
(ICES CM documents;2009/I:21, Working paper, 2009)Echo sounders are a widely used tool for observing marine ecosystems. Traditionally, carefully designed surveys are used to integrate biomass to a global estimate, which is coupled to traditional stock assessment models. ... -
Detailed in situ target strength measurements of 0-group cod
(ICES CM Documents;1994/B:30, Working paper, 1994)Target strength measurements in situ of cod fry have been made using 38 and 120 kHz split beam echo sounders. Two data sets are sampled in essentially pure, evenly sized, cod concentrations, one in a Ullsfjord, Northern ... -
Detection and counting of individual free-swimming krill using a 2MHz scanning sonar
(ICES CM Documents;1992/L:18, Working paper, 1992)The euphausiid crustacean Meganyctiphanes norvegica (M. Sars) have been detected and counted in the scanning section of a 2 MHz scanning sonar beam up to 3 meters from the sonar head. The tests completes a pilot investigation ... -
Detection of internally tagged fish with special application to the atlanto-scandian herring
(ICES CM Documents;1977/H:20, Working paper, 1977)The paper describes the operating principle and use of a new machine for detection and sorting of internally tagged fish. The machine has been used in the calculation of the Atlanto-Scandian herring stock size. Fixed ... -
Detection of spatial distribution of acoustic categories
(ICES CM documents, Working paper, 2005) -
The determination of age in halibut and the age distribution of spawning halibut in North Norway 1956
(ICES CM Documents;, Working paper, 1956)