Blar i Fiskeridirektoratets skrifter, Serie Havundersøkelser (1900-1990) på tittel
Viser treff 47-66 av 314
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Design of a sonar for fish counting
(Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1969)The paper described (a) A very high resolution echo-sounder, (b) A method of sorting echoes by amplitude and range, (c) A study of the analysis required to transform from distribution of echoes to distribution of ... -
Differentiation between "marinus" and "mentella" types of redfish by electrophoresis of haemoglobins
(Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1978)Haemoglobins of 225 specimens of redfish from the Barents Sea and 357 specimens from Icelandic waters were analysed by electrophoresis to search for genetic differences between the morphologian marinus and mentella ... -
Digestion rate of food particles in the gut of larval herring (Clupea harengus L)
(Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1983)Laboratory experiments with herring larvae (Clupea harengus L.) from the local stock in Lindåspollene, north of Bergen, Norway, were performed in the spring of 1978 and 1979. Digestion rates of copepod nauplii and polychaet ... -
Distribution of mackerel eggs and larvae in the Skagerrak, 1957-1959
(Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1965)Numbers of mackerel eggs and larvae collected from 495 vertical hauls at 269 stations in the Skagerrak and Oslofjord, 1957-59 are analysed. Eggs were found in practically all areas of the Skagerrak during the sampling ... -
Distribution of multiple forms of lactate dehydrogenase, aspartate aminotransferase and serum esterase in herring from Norwegian waters
(Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1970)1. By use of combined starch and agar gel electrophoresis 10 samples (1258 specimens) were studied for serum esterase polymorphism, 13 samples (1454 specimens) for lactate dehydrogenase (LDH) polymorphism~ and one sample ... -
Distribution, abundance and mortality of young and adolescent Norwegian spring spawning herring (Clupea harengus Linné) in relation to subsequent year-class strength
(Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1970)1. The distribution of young and adolescent herring in coastal and offshore waters of northern Norway has been investigated for the 1959- 1965 year-classes by combined acoustic surveys and fishing experiments. 2. In the ... -
Diving observations on Barents Sea capelin at the spawning grounds off northern Norway
(Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1973)During the spring of 1971 divers made observations at the spawning grounds of the Barents Sea capelin. Large masses of capelin eggs were found at two localities: Loppa, (35-70 m depth) and Nordvågen (12-18 m depth). The ... -
The duration of the first two yolk sac stages in herring (Clupea Harengus L.) larvae
(Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1986)Artifically fertilized and naturally spawned herring eggs from the local herring stock in Lindåspollene, north of Bergen, Norway, were hatched at 9°C in 1978 and at 6°C in 1979. The purpose was to calculate the duration ... -
Ecological investigations on the spawning grounds of the Barents Sea capelin
(Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1975)SÆTRE, R. and GJØSÆTER, J. 1975. Ecological investigations on the spawning grounds of the Barents Sea capelin. FiskDir. Skr. Ser. HavUnders., 16: 203-227. A programme to study the reproduction of the Barents Sea capelin ... -
The effect of fishing on size composition and sex ratio of offshore lobster stocks
(Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1969)The lobster fishery in the offshore waters of southern New England is in the early stages of development. The assumption that canyon fishing grounds closest to shore are the most heavily fished was supported by a lower ... -
Effects of ocean thermal structure on fish finding with sonar
(Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1969)1. The width of the sound beam trapped in the surface channel depends, besides on MLD and INGRAD, also on SST. The latter relation is brought about by nonlinearity in the sound speed dependence on temperature and depth ... -
Einar Koefoed and his work as zoologist during the practical-scientific fishery investigations in northern waters from 1923-38
(Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1963) -
Estimates of pup production, age at first parturition and natural mortality for hooded seals in the west ice
(Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1984)An analysis of the population of hooded seals breeding in the West Ice near Jan Mayen was carried out on the basis of catch statistics for 1946-1978 and age samples comprising a total of 5 094 four years old and older ... -
Estimates of stock size and reproduction of the Barents Sea capelin in 1970-1972
(Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1973)DRAGESUND, O., GJØSÆTER, J. and MONSTAD, T. 1973. Estimates of stock size and reproduction of the Barents Sea capelin in 1970-1972. FiskDir. Skr. Ser. HavUnders., 16: 105-139. The distribution and migration of young ... -
Experiments with the Clarke-Bumpus Plankton Sampler and with a Plankton Pump in the Lofoten Area in Northern Norway
(Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1948) -
The Exploitation of the Spiny Dogfish (Squalus acanthias L.) in European Waters
(Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1964)The present paper is a short account of the state of the stock in recent years of Squalus acanthias in European waters. The basic material is the catch statistics from Bulletin Statistique (ICES), the Norwegian spur-dog ... -
Factors influencing the Size of the Year Classes in the Arcto-Norwegian Tribe of Cod
(Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1957)1. The quantitative occurrence of eggs and larvae of the Arcto-Norwegian cod in the coastal and bank areas of northern Norway during the years 1948-1956 has been studied. 2. There is no correlation between the abundance ... -
Factors influencing year-class strength of Norwegian spring spawning herring (Clupea harengus Linné)
(Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1970)1. Variation in year-class strength of Norwegian spring spawning herring is analysed in relation to the structure and the size of the spawning stock, the location and the time of spawning and environmental conditions during ... -
Faktorer av betydning for fiskeeggenes og fiskeyngelens oppvekst
(Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1952)During the last 10 years we have been experimenting in the laboratory at the Flødevigen Sea-Fish Hatchery with the rearing of several species of salt-water fishes. The intention has been to bring about better methods ... -
Fecundity and egg size of spring spawning Barents Sea capelin
(Fiskeridirektoratets skrifter, Serie Havundersøkelser, Research report, 1973)Fecundity of Barents Sea capelin was studied in 1971 and 1972. No differences were found between these two years. The regression line log F = 3.4871 x log L - 0.2049 was fitted to the whole material. This is in good ...