Blar i Flødevigens rapportserie (1982-1992) på dokumenttype "Conference object"
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The haemoglobin polymorphism in Atlantic cod (Gadus morhua L.); genotypic differences in somatic growth and in maturing age in natural populations. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)The two common alleles at the polymorphic haemoglobin locus HbI (Sick, 1961) in the Atlantic cod (Gadus morhua L.) code for proteins whose functional properties are differentially influenced by environmental ... -
Importance of genetic variation in the propagation of cod. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)During the last decade the existence of genetic diversity within species and populations has been generally accepted. The complex structure of populations as well as the variations within populations is believed to be ... -
Inferences regarding predation on the early life stages of cod and other fishes. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)Little information exists on the predation on the early life stages of marine fish in general and even less on cod. Thus the approach used in this review was to infer the predatory processes that may be significant in ... -
Ingestion of bacteria by cod (Gadus morhua L.) larvae. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)The uptake of Rhodamine-labelled bacteria by cod larvae was demonstrated using a fluorescent microscopy technique, which allowed a quick estimate of bacterial uptake and gut clearance. Live or heat-killed bacteria, ... -
The intensive tearing of juvenile 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)Cod were reared in the laboratory from the egg to marketable size using cultured live foods for the early stages and then artificial diets. Survival to metamorphosis was about 10%; subsequent mortalities were negligible. The ... -
Large-scale rearing of cod fry on the natural food production in an enclosed pond. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)For four years (1980-1983) populations of 5 day old cod larvae have been transferred to a dammed seawater pond (60 000 m^3 ). The water volume had been treated with rotenone in advance, and the larvae were released ... -
Larval fish trophodynamic studies on Georges Bank: sampling strategy and initial results. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)A sampling strategy is outlined to serve as a framework for determining the fine- to micro-scale vertical disribution or fish larvae and their prey on Georges Bank in a single vessel, interdisciplinary mode of operation. ... -
The management of cod stocks with special reference to growth and recruitment overfishing and the question whether artificial propagation can help solve management problems. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)The terms qrowth overfishinq and recruitment overfishinq are defined. The exploitation and management of two of the major cod stocks in the North-East Atlantic, North-East Arctic cod and North Sea cod, are briefly ... -
Morphological, psychological and genetical studies of egg quality in 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 development of cod eggs from various parent fishes was studied. Fertilization success, and proportion of normally developing embryos and larvae varied according to the quality of the eggs. Eggs from poor quality cultures ... -
Neuromasts and cupular growth of cod larvae. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)Use of phase contrast microscopy and vital staining showed that newly hatched cod larvae had five free neuromasts on either side of the body and four on the head. About three weeks later, when feeding was established ... -
The peculiarity of the development of White Sea cod. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)The paper discusses the main results of many years of research into spawning conditions and embryonic and larval developmenr of the White Sea cod, i.e., peculiaritres in morphogenesis, in the formation, structure and ... -
Properties of a new artificial diet for fish larvae, including 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)A dry feed produced from cod roe has been shown to support growth of cod larvae, although not beyond metamorphosis. Cod larvae respond to the feed by producrng trypsin. Since cod roe is very rich in polyunsaturated fatty ... -
A relationship between the number of growth increments on the otoliths and age of larval and juvenile 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)A study of the relationship between the number of growth increments on the otoliths and age was based on larval and juvenile cod, Gadus morhua L., from laboratory and pond reared populations. Lapilli were larger than ... -
Sampling fish larvae with large pumps; quantitative and qualitative comparisons with traditional gear. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)Different types of submersible pump systems, ranging in capacity from 3 to 60 m^3/min, have been tested during the period 1977-83 to collect fish eggs and larvae from discrete depths in the Lofoten area. Comparisons ... -
Spawning area and distribution of 0-group cod, Gadus morhua L., on the Møre coast. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Fødevigen rapportserie, Conference object, 1984)This paper deals with the location of some major spawning grounds for cod, Gadus morhua L., on the Møre coast. The density distribution of adults prior to spawning and the 0-group fish later on was recorded. The two ... -
Spawning grounds of the Arcto-Norwegian cod outside Vestfjorden. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)The spawning area of the Arcto-Norwegian cod is vast, extending from 62 degrees N to 74 degrees 30'N in the area investigated. Localities characterized by an intensive rate of spawning are in the Norwegian Sea over the ... -
Stock structure of cod in the Møre area. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)Recently several research projects have involved studies of cod in the Møre area. Due to a common sampling programme a large number of individual fish have been classified for biological and genetical characters. The ... -
Summary of proceedings of a symposium on the propagation of cod. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
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Tagging and release experiments on 0-group coastal cod (Gadus morhua L.) reared in an outdoor basin
(Flødevigen rapportserie, Conference object, 1984)Juvenile coastal cod (Gadus morhua L.), hatched in the laboratory and reared in a large outdoor basin at Flødevigen Biological Station, were tagged and released in coastal waters in southern Norway. They were released ... -
The timing of cod spawning on the Scotian Shelf
(Flødevigen rapportserie, Conference object, 1984)We used results from the Scotian Shelf Ichtyoplankton Programme to describe the spatial and temporal distributions of cod eggs and larvae off the coast of Nova Scotia. Summer spawning is restricted to the waters along ...