ICES CM documents authored by IMR scientists (1949-2011): Nye registreringer
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Effects of continuous flow rate on development and mortality of halibut yolk sac larvae
(ICES CM Documents;1990/F:41, Working paper, 1990)Halibut (Hippoglossus hippoglossus L.) yolk sac larvae were raised in incubators with different rates of continuous flow. Most larvae died between Days 10 and 29 after hatching. Rate of mortality increased with increasing ... -
Antibacterial treatment procedures of eggs of halibut (Hippoglossus hippoglossus L.)
(ICES CM Documents;1990/F:39, Working paper, 1990)Halibut eggs were surface disinfected with a iodophor one day before hatching, and mortality and larval development was recorded until the time of first feeding. The groups exposed to higher concentrations of disinfectant ... -
Report of the Herring Assessment Working Group for the Area South of 62°N [Copenhagen, 27 March - 6 April, 1990]
(ICES CM Documents;1990/Assess:14, Working paper, 1990) -
Report of the Working Group on Introductions and Transfers of Marine Organisms [Halifax, 6- 8 June, 1990]
(ICES CM Documents;1990/F:14, Working paper, 1990) -
Effects of organic waste from marine fish farms on the seabottom beneath the cages
(ICES CM Documents;1990/F:34, Working paper, 1990)Seven fish farms and a control station were investigated four times during one year. The farms represented a gradient of increasing accumulation of organic waste on the sea bottom. The thickness and the organic content ... -
Report of the Working Group on Nephrops Stocks [Nantes, France, 21- 28 March, 1990]
(ICES CM Documents;1990/Assess:16, Working paper, 1990) -
Report of Industrial Fisheries Working Group [Copenhagen, 20- 27 March, 1990]
(ICES CM Documents;1990/Assess:13, Working paper, 1990) -
Report of the Working Group on Pathology and Diseases of Marine Organisms [Vigo, 23- 27 April, 1990]
(ICES CM Documents;1990/F:13, Working paper, 1990) -
Absorption of acoustic energy in dense herring schools studied by the attenuation in the bottom echo signal
(ICES CM Documents;1990/B:2, Working paper, 1990)The absorption of acoustic energy in herring schools is studied by echo integration of the bottom signal under various densities of herring. The investigations were carried out in a fjord in northern Norway, where large ... -
Swimming behaviour of fish schools in the North Sea during acoustic surveying and pelagic sampling trawling
(ICES CM Documents;1990/B:38, Working paper, 1990)Swimming behaviour of schooling herring, mackerel and sprat, when approached by a survey vessel, was observed by aid of a true motion sonar. Observations were made both during surveying and during pelagic trawling. Horizontal ... -
Comparative growth and survival of two genetic strains of Atlantic cod (Gadus morhua L.) reared through the early life stages in a marine pond in western Norway
(ICES CM Documents;1990/F:48, Working paper, 1990)The investigation was carried out in a marine pond in western Norway during spring and summer 1990. Two genetic defined strains of Atlantic cod (Gadus morhua L.) were used as broodstocks. A total of 11.1 x 10^6 cod larvae ... -
Weaning trials with cod fry on artificial diets
(ICES CM Documents;1990/F:47, Working paper, 1990)Three experiments with different size groups of cod fry, 13, 49 and 465 mg wet-weight were offered 6 different artificial diets. The experiments lasted for 28 days. Growth, and for the medium size-group chemical composition ... -
The Jutland Current: Nutrients and physical oceanographic conditions in late autumn 1989
(ICES CM Documents;1990/C:35, Working paper, 1990)Hydrography, currents, nutrients, water transparency, in situ chlorophyll fluorescence and primary production were studied during a cruise with R/V "G.O. Sars" to the west coast of Denmark, Skagerrak and Kattegat from ... -
Optimal acoustic beam pattern corrections for split beam transducers
(ICES CM Documents;1990/B:30, Working paper, 1990)Precise in situ target strength estimates of fish can only be made when the effect of the transducer directivity is totally removed from the recorded target amplitudes. By guiding a standard calibration target through ... -
Relationships between the geometric dimensions and biomass of schools
(ICES CM Documents;1990/B:41, Working paper, 1990)Acoustic measurements of the geometric dimensions and packing density of herring, sprat and saithe schools have been conducted by multi-beam sonars and echo integrator systems. Relationships between the reflected echo ... -
Initial feeding rates of Atlantic halibut larvae (Hippoglossus hippoglossus) at different prey densities
(ICES CM Documents;1990/F:44, Working paper, 1990)At the end of yolksac stage (36 days after hatching) halibut larvae were offered the prey organism Artemia salina at different densities ranging from 1 to 100.000 litre ^- 1. The feeding experiment was carried out in 11 ... -
Bacterial diseases of eggs and yolk sac larvae of halibut (Hippoglossus hippoglossus L.): Characterization and experimental infection
(ICES CM Documents;1990/F:38, Working paper, 1990)Scanning electron micrographs of halibut eggs which were shown to have an epiflora dominated by a Flexibacter sp., revealed wounds colonized by large amounts of bacteria. The chorion was penetrated in most wounds, and ... -
SKAGEX 1990. Preliminary results from the nutrient intercalibration
(ICES CM Documents;1990/C:44, Working paper, 1990)An important part of SKAGEX 1990 was the nutrient intercalibration, which was performed to simulate ordinary work at sea. 44 water samples of 0,5 liter were delivered to each of the 13 participating research vessels in ... -
How to correct fish density estimates for extinction
(ICES CM Documents;1990/B:24, Working paper, 1990)There have been many experimental studies on acoustic shadowing, but once the effect is quantified, how is the compensation to be effected? This work shows how, through postprocessing of stored time series, containing ... -
Hull mounted, protruding transducer for improving echo integration in bad weather
(ICES CM Documents;1990/B:31, Working paper, 1990)A 38 kHz split beam survey transducer has been mounted on the tip of a 4 m vertical protrusile stabilizing keel of the United States NOAA fishery research vessel R/V Miller Freeman. Air blocking problems, generally ...