Blar i Flødevigens rapportserie (1982-1992) på dokumenttype "Conference object"
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0-group cod investigations on the Norwegian Skagerrak coast. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)Since 1917 0-group cod have been sampled by beach seine along the Norwegian Skagerrak coast. The average number of 0-group per haul is found to give a relatively reliable estimate of year class strenqth. There was a ... -
Ambryogenesis and growth of otoliths in the cod (Gadus morhua L.). In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)The embryogenesis and growth of the otoliths in the cod (Gadus morhua L.) was studied by light microscopy and transmission electron microscopy. The first indication of otolith formation was the appearance of electron-dense ... -
Biochemical genetic identification and population genetic studies of marine fish eggs. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)The visually indistinguishable eggs of various fish species may be identified by species-specific zymograms. Polymorphic loci in identified eggs permit estimation of allele-frequencies for use in population structure ... -
Biology and management of the Pacific cod (Gadus macrocephalus Tilesius) resource in the eastern Bering Sea and Gulf of Alaska. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)Pacific cod have been exploited in Alaska for over 100 years. Originally, the fishery was exploited in coastal waters by U. S. fishermen. This domestic fishery declined following World War I, ceasing by the early 1950's ... -
A case study on the distribution of cod larvae and availability of prey organisms in relation to physical processes in Lofoten. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)The distribution of cod larvae and copepod nauplii off the Lofoten islands was studied in the years 1979-82. The highest concentrations of cod larvae and copepod nauplii were found in the Austnesfjord, Hølla-Henningsvær ... -
Cod (Gadus morhua L.) off Møre - Composition and migration. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)Important spawning- as well as nursery- and feeding areas for cod, Gadus morhua L. are found off the Møre coast. In this paper age compositions, age at first spawninq, otolith patterns and migration of cod in the Møre ... -
Cod fish otoliths: information storage structures. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)The otoliths of cod fish may have incorporated within their structural and chemical components a large amount of lifehistory information. This information may be revealed when appropriate analytical methods are utilized. ... -
Cod larvae sampling with a large pump off SW-Island. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)In an attempt to collect adequate samples of cod and other larvae in the spawning areas off SW-Iceland, experiments using a large fish pump for this purpose were carried out from 1981 to 1983. The pump used was an 8" ... -
Criteria for condition evolved from enclosure experiments with cod larva populations. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)A number of experiments have been carried out with cod larvae in mesocosms at variable feeding conditions. Larval growth and survival has been monitored beyond metamorphosis, and in some of the experiments large ... -
Development and mortality of cod (Gadus morhua L.) eggs and larvae in different temperatures. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)This experiment was carried out as a part of a project concerning thermal pollution from a power plant. The paper deals with development and mortality of cod eggs and larvae in different temperatures (6O-18 degrees C). ... -
Disease problems in cod rearing. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)Disease seems to be an inevitable part of fish rearing systems, and the first disease problems in the Austevoll cod rearing experiments are reported. Work on prophylactic treatment against vibriosis through vaccination ... -
Distribution of eggs and larvae of gadoid fishes from Stad to Lofoten during April 1976-1982. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)Fish eggs and larvae have been sampled during the study of herring larvae distribution. Since 1976 these findings have been recorded. Most of the gadoid eggs are difficult to identify, but identification of larvae and ... -
The distribution of young cod. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)The distribution of young cod in the North Sea is described, using catch data from national and international trawl surveys and experimental fishing. Information on seasonal movements and feeding related to the concentration ... -
Does cod farming have a commercial future? A technical and economic assessment. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)Cod is a traditional favourite with British consumers, but supplies have fallen dramatically through the 1960's and 70's as a result of imposed fishing limitations. Maintenance of supplies for the future will depend on ... -
Food consumption rate and gut evacuation processes of first feeding cod larvae In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)Laboratory experiments with cod larvae (Gadus morhua L.) during optimum feeding conditions showed that cod larvae were sporadic feeders rather than continuous feeders. Digestion rate of copepod nauplii was less than 30 ... -
The future of cod farming and the possibility of restocking local coastal cod populations. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
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Genetic analyses of cod in northern norway. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)Several polymorphic proteins have been used in studies of cod stock structure in northern Norway. Samples of Arctic cod spawning in Lofoten in the spring of 1981 were analysed for enzyme polymorphism by starch gel ... -
Growth of cod in relation to fish size and ration level. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)This study presents the main results of a series of growth experiments on cod with particular reference to ration size, size of the fish and growth and feeding in the spawning season. The experiments were started in ... -
Growth, energy consumption and prey density requirements in first feeding larvae of cod (Gadus morhua L.). In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)Growth, oxygen uptake, swimming activity, feeding ability and energy content were investigated in cod larvae from several groups under different experimental conditions. At yolk absorption the larvae consumed 0.090-0.120 ... -
Growth, mortality and feeding of cod (Gadus morhua L.) larvae in enclosed water columns and in laboratory tanks. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)In April 1982 cod larvae were reared in four 30 l laboratory tanks and in two 300,000 l columnar plastic enclosures for 3-4 weeks from hatching. North Sea oil "production water" was added to one of the enclosures ...