ICES CM documents authored by IMR scientists (1949-2011): Nye registreringer
Viser treff 2861-2880 av 3138
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Stomach contents of North-East Arctic cod and possible changes in the diet the last years
(ICES CM documents, Working paper, 1986)A stomach sampling program has been carried out in connection with the construction of a multispecies modell for the Barents Sea. The results on the contents of 8410 cos (Gadus morhua) stomachs sampled in 1982-1985 are ... -
The cestode parasite Grillotia Angeli as a biological tag for mackerel in the eastern North Atlantic
(ICES CM documents, Working paper, 1984)The trypanorhynch cestode Grillotia angeli Dollfus, 1969, infects mackerel Scomber scombrus L. up to the age of two years and survives thereafter as an encvsted plerocercus for as long as the mackerel lives. In the eastern ... -
Interactions between cod (Gadus morhua) and deep sea shrimp (Pandalus Borealis) in the Barents Sea
(ICES CM documents, Working paper, 1991)For some of the most important deep sea shrimp (Pandalus borealis) areas in the Barents Sea the content of shrimp in cod (Gadus morhua) stomachs during the first part of each year in the period 1984-1990 is analysed. Total ... -
Gastric evacuation rate in mackerel (Scomber scombrus L.)
(ICES CM documents, Working paper, 1983)About 1500 mackerel, 25-45 cm in Length, were kept in a net for l0 days. In two experiments the fish were £ed frozen euphausiids -ad. libiturn, and the wet weight of the stomach content determined every second hour for ... -
Predation by Benguela hake (Merluccius polli) on commercially exploited shrimps (Parapenaeus longirostris and Aristeus varidens) in Angolan waters.
(ICES CM documents, Working paper, 1997) -
Acoustic methods in studies of fish ecology
(ICES CM documents, Working paper, 1998)Systematic use of echo sounder in fisheries and marine science comrnenced in the 1930's and developed rapidly after World War II. During the 1950's and 1960's large scale echo surveys were carried out in many regions as a ... -
Corrections of indices of abundance of 0-group fish in the Barents Sea for varying capture efficiency
(ICES CM documents, Working paper, 1996)Each year since 1965 "The International 0-group Survey in the Barents Sea and Adjacent Waters" has provided indices of abundance of 0-group fish. During the 30 years of operation of the survey large improvements in capture ... -
Spatial distribution of variables in marine environmental and fisheries research Part II: Distribution and length of 0-group fish in relation to environmental factors
(ICES CM documents, Working paper, 1998)Each year in August-September joint Norwegian-Russian 0-group surveys are carried out in the Barents Sea and adjacent waters. Based on data from these surveys, the ambient temperature and salinity for several species were ... -
Preliminary report of the Norwegian investigations on young cod and haddock in the Barents Sea
(ICES CM documents, Working paper, 1986)An acoustic survey and a bottom trawl survey for cod and haddock were carried out in the Barents Sea during the winter 1986. As a result of strong improvement in the recruitment for both species, most of the echo abundance ... -
Norwegian combined acoustic and bottom trawl surveys for demersal fish in the Barents Sea during winter
(ICES CM documents, Working paper, 1997)A combined acoustic and bottom trawl survey for demersal fish in the Barents Sea has been conducted annually since 1981. The main aim is to map the spatial distribution and obtain indices of abundance (numbers at age) ... -
Monitoring ecosystems using research surveys: Maximizing information and minimizing cost
(ICES CM documents, Working paper, 2001)Indices or estimates of abundance generated by research vessel surveys are becoming ever more important for assessing marine resources. Most often survey abundance indices are used in conjunction with commercial catch data ... -
Estimates of stock size of northeast arctic cod and haddock, Sebastes mentella and Sebastes marinus from survey data, winter 1989
(ICES CM documents, Working paper, 1989)The combined acoustic and bottom trawl survey in the Barents Sea in winter has been carried out since 1981. The target species are cod and haddock, but in recent years the redfish species Sebastes marinus and Sebastes ... -
Length and species dependent diurnal variation in catch rates in the Norwegian Barents Sea bottom trawl surveys
(ICES CM documents, Working paper, 1997)Diurnal variation in capture efficiency may add to the variability in swept area estimates (or indices) from bottom trawl surveys. In the present study the relationship between the day/night ratio of swept area estimates ... -
Acoustic estimates of spawning cod off Lofoten and Møre in 1984
(ICES CM documents, Working paper, 1984)Acoustic surveys on northeast Arctic spawning cod were carried out in Lofoten and off Møre in March-April 1984 in order to estimate the stock size and structure. Within the investigated areas the total number at spawning ... -
Preliminary report of the Norwegian investigations on young cod and haddock in the Barents Sea during the winter 1985
(ICES CM documents, Working paper, 1985)An acoustic survey and a bottom trawl survey for cod and haddock were carried out in the Barents Sea during the winter 1985. The acoustic data and the biological data from trawl stations were combined in two different ways, ... -
On the geographical distribution of arctic cod in relation to the distribution of bottom temperatures in the Barents Sea, 1977-1984
(ICES CM documents, Working paper, 1984)The results from acoustic-trawl surveys in January-March were analysed together with observations of bottom temperatures at the same cruises. Distributions of fish abundance for each age group of cod on temperature were ... -
In situ fish target strengths derived with a split-beam echo sounder
(ICES CM documents, Working paper, 1985)In-situ target strengths of six fishes were determined with a split-beam echo sounder during cruises about Lofoten in March 1984 and the Shetland Islands in July 1984. The species and lengths, mean and standard deviation, ... -
Stock size of north-east arctic cod, estimates from survey data 1984/85
(ICES CM documents, Working paper, 1985)Both the total and spawning stocks of North-East Arctic cod were assessed using Norwegian survey data and commercial landings. The total stock at 1 January 1985 was estimated to about 5100 million specimens, of which age ... -
Ambient temperature and distribution of northeast arctic cod
(ICES CM documents, Working paper, 1996)Most studies on the effects of field temperature on fish distribution and population parameters have considered the temperature and its variability at fixed stations or sections rather than the temperature in the actual ...