Blar i Flødevigens rapportserie (1982-1992) på utgivelsesdato
Viser treff 21-40 av 67
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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 ... -
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
(Flødevigen rapportserie, Conference object, 1984) -
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 ... -
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 ... -
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 ... -
Variation of peak spawning of arcto-Norwegian cod (Gadus morhua L.) during the time period 1929-1982 based on indices estimated from fishery statistics. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)The weekly amounts of roe and cod landed in the main spawning area at Vestfjorden are known since 1929. An index of the median of the spawning intensity curve was constructed on the basis of an analogy to the gonosomatic ... -
Yearclass strength of north-east Arctic cod at the 0-group stage. In: The propagation of cod Gadus morhua L.: an international symposium, Arendal, 14 - 17 June 1983
(Flødevigen rapportserie, Conference object, 1984)On the basis of recent developments in artificial propagation of cod fry it has been suggested that propagated cod fry may be released in the Barents Sea and the Svalbard region, the feeding areas of North-East Arctic ... -
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 ... -
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 ... -
Trypsin and trypsinogen as indices of growth and survival potential of 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)Using a radioimmunoassay it could be demonstrated that the content of trypsin and trypsinogen in cod larvae increased markedly during the first 4 days after hatching. In the same period the trypsin activity, measured ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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, ... -
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 ... -
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 ...