ICES CM documents authored by IMR scientists (1949-2011): Recent submissions
Now showing items 3021-3040 of 3138
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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 ... -
Review and evaluation of three mitigation measures - bird-scaring line, underwater setting and line shooter - to reduce seabird bycatch in the Norwegian longline fishery
(ICES CM documents, Working paper, 2000)Seabirds scavenge baits from the hooks of commercial longlines, resulting in incidental seabird mortality and bait loss. As interactions between seabirds and longline fishing may cause decline in seabird populations and ... -
Marine Habitat Mapping for the Norwegian Sea
(ICES CM documents, Working paper, 2000)An initiative is currently being taken by several Norwegian organizations to obtain funds to intensify ongoing investigations on marine sea-floor mapping off Norway. Led by the Geological Survey of Norway and Institute ... -
Comparison of Uncertainty Estimates in the Short Term Using Real Data
(ICES CM documents, Working paper, 2000)In response to increased interest in the Precautionary Approach, various approaches have been applied to characterize the uncertainty of fisheries assessment projection results. Using three case studies, a comparison of ... -
Some environmental factors that influence the growth of Arcto-Norwegian cod from the early juvenile to the adult stage
(ICES CM documents, Working paper, 2000)A high growth rate for Arcto-Norwegian cod (Gadus morhua L.) in the Barents Sea and adjacent areas from the larval stage to the 0-group stage enhances survival and ultimately recruitment to the fishery. However, it appears ... -
Recruitment variability in Norwegian spring-spawning herring (Clupea harengus L.): the effect of temperature in larval drift trajectories
(ICES CM documents, Working paper, 2000)During late winter, the Norwegian spring-pawning (NSS) herring migrate southward along the Norwegian coast to spawn in March-April. The larvae drift northwards in the Norwegian coastal current during their first months and ... -
The correlation between tag-recovery data and VPA-data in Norwegian spring spawning herring
(ICES CM documents, Working paper, 2001) -
Spatial density distributions of fish, a balance between environmental and physiological limitation
(ICES CM documents, Working paper, 2001)Data (trawl, acoustic, CTD) from four scientific survey series , i.e. along the Norwegian coast, in the North Sea, and in the Barents Sea summer and winter, are used to describe and discuss the spatial density distributions ... -
Experiments on tagging mortality and shedding in captive Norwegian spring spawning herring: effects of tagging season and tag type
(ICES CM documents, Working paper, 2001) -
Modeling fish reaction to vessel noise, the significance of the reaction thresholds
(ICES CM documents, Working paper, 2001)A simple model of fish reaction to vessel noise is made. The fish are assumed to swim directly away from the noise source. The main noise source is assumed to be the propeller. Parameters for endurance and swimming speed ... -
Age readings of Sebastes marinus otoliths: bias and precision between readers and otolith preparation methods
(ICES CM documents, Working paper, 2001)This study presents a comparative age reading on Sebastes marinus from the Icelandic shelf within an otolith exchange program between institutes in Germany, Iceland and Norway. Out of a series of 212 otolith pairs, ... -
On the mechanisms behind salinity anomaly signals of the northern North Atlantic
(ICES CM documents, Working paper, 2001) -
In vitro ecotoxicological assessment of pelagic ecosystems
(ICES CM documents, Working paper, 2002)The ICES biological effects monitoring in pelagic ecosystems (BECPELAG) workshop is a multi-national, multi-disciplinary workshop aimed at establishing suitable techniques for monitoring the effects of contaminants on ... -
A comparison of variability and bias when ageing Northeastern Atlantic minke whales (Balaenoptera acutorostrata) by counting growth layer groups in the mandible and bulla tympanica
(ICES CM documents, Working paper, 2001)The age of 43 minke whales (Balaenoptera acutorostrata) was estimated by counting growth layer groups (GLGs) GLGs in 500um thick haemotoxylin stained transverse sections of left and right mandible. The same whales were ... -
Estimates of towing time in surveys
(ICES CM documents, Working paper, 2002)To decide the start and stop time for a survey haul the current method used in Norwegian sampling are the data from the door sensors and height sensors of the trawl. When the trawl has achieved its right geometry, the start ... -
Relationship between atresia, fish size and condition in Icelandic cod (Gadus morhua L.)
(ICES CM documents, Working paper, 2001)Cod is a determinate spawner, with a high potential fecundity. That is, a large definite number of oocytes start maturing prior to spawning. Environmental factors, such as water temperature and food availability have ... -
Maintenance of genetic diversity: challenges for management of marine resources
(ICES CM documents, Working paper, 2002)There are three general classes of threat to biodiversity at the gene level: 1) extinction, which results in complete and irreversible loss of genes; 2) hybridization, which may cause re-arrangement of co-adapted genes and ... -
Impact of herring spawning behaviour on acoustic abundance estimates
(ICES CM documents, Working paper, 2001)Spawning dynamics of Norwegian spring spawning herring was studied in south western Norway 29 March to 3 April 2000 using hydroacoustics. The horizontal distribution of the spawning layers shifted in a south-easterly ... -
Fisheries-induced trends in reaction norms for maturation in North Sea plaice
(ICES CM documents, Working paper, 2002)We analyse the potential of intensive exploitation to have caused evolutionary changes in the age and length at maturation in North Sea plaice Pleuronectes platessa. Such evolutionary change in the onset of maturation ... -
Fisheries-Induced Changes in Age and Size at Maturation and Understanding the Potential for Selection-Induced Stock Collapse
(ICES CM documents, Working paper, 2002)Fishing is very likely to create selective pressures inducing adaptive changes in the life histories of harvested stocks. Using field data and adequate statistical methods, such alterations can be demonstrated. However, ...