Blar i Flødevigens rapportserie (1982-1992) på tittel
Viser treff 20-39 av 67
-
Estimates of the abundance of mesopelagic fish off southern Norway and west of the British Isles 1971-1976. In: Flødevigen rapportserie no 1, 1986
(Flødevigen rapportserie, Research report, 1986)Mesopelagic fish were studied using 38 and 50 kHz echo sounders and electronic integrators on cruises covering the Norwegian Deep, Skagerrak, the slope north of the North Sea and west of the British Isles during 1971-1976. ... -
Fecundity studies on sprat, Sprattus sprattus L., from a fjord on the Norwegian Skagerrak coast. In: Flødevigen rapportserie no 1, 1992
(Flødevigen rapportserie, Research report, 1992)Data were collected monthly from sprat caught with trawl in Frierfjord, during January-May in 1985 and 1986. Sprat used ranged from 7 to 15 cm and from 2.1 to 27.9 g. Ichthyoplankton was sampled to follow the spawning ... -
Feeding behaviour of Diaphus dumerilii in NW Africa with notes on its relations to other myctophids in the area. In: Flødevigen rapportserie no 1, 1988
(Flødevigen rapportserie, Research report, 1988)The feeding pattern of D. dumerilii was studied based on material collected by R/V "Dr. Fridtjof Nansen" from west Africa (from Mauritania to Nigeria-Congo area and the Cape Verde Islands) in 1981. The other species. ... -
Fiskeribiologiske undersøkelser i Langesundsområdet, 1974-1978
(Flødevigen rapportserie, Research report, 1983)From 1974 to 1978 R/V "G.M. Dannevig" was used for 7-8 cruises yearly in the Langesund area. Parameters sampled at 7 stations were: temperature, salinity and oxygen in standard depths, phytoplankton studies in the upper ... -
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 ... -
Food selection in cod (Gadus morhua): reactions to colour and smell. In: Flødevigen rapportserie no 1, 1990
(Flødevigen rapportserie, Research report, 1990)Cod were offered food and food imitations with various colours and smells. When offered crabs with natural colour and with the carapace painted in red, yellow or green, they showed no significant preference. Neither did ... -
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) -
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 ... -
Gyting hos hyse (Melanogrammus aeglefinus) under experimentelle betingelser
(Flødevigen rapportserie, Research report, 1982)Maturing haddocks were caught in late January 1982 and transferred to a spawning basin at the State Biological Station Flødevigen, Arendal. The spawning took place from February 26th to May 27th, with a maximum in March ... -
Habitat selection and inter year class interactions of young cod (Gadus morhua) in aquaria. In: Flødevigen rapportserie no 1, 1987
(Flødevigen rapportserie, Research report, 1987)Groups of five small (12 - 18 cm) cod were kept in aquaria with two compartments, one with sand and one with stones and algae. When alone, the small fish usually spent most of the time in the compartment with stones and ... -
Habitat selection of juvenile cod (Gadus morhua), whiting (Merlangus merlangius) and some littoral fish in an aquarium. In: Flødevigen rapportserie no 1, 1987
(Flødevigen rapportserie, Research report, 1987)Experiments were conducted to study the habit at selection of juvenile cod Gadus morhua, juvenile whiting merlangus merlangius, black goby Gobius niger, great pipefish Syngnathus acus, sand eel Ammodytes tobianus, ... -
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 ... -
Hydrografi i Oslofjorden og Langesundsområdet 1974-1978
(Flødevigen rapportserie, Research report, 1982) -
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 ...