Browsing Flødevigens rapportserie (1982-1992) by Title
Now showing items 41-60 of 67
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Large-scale rearing of cod fry on the natural food production in enclosed pond
(Flødevigen rapportserie, Research report, 1983-06) -
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 ... -
Mass occurrence of Gyrodinium aureolum Hulburt and fish mortality along the southern coast of Norway in September-October 1981
(Flødevigen rapportserie, Research report, 1982)At the end of September 1981 the sea appeared "coffee brown" along the southern coast of Norway due to mass occurrence of Gyrodinium aureolum Hulburt. The maximum cell concentration observed was 70*10^6 cells*1^-1. When ... -
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 ... -
Prediction of year-class strength of coastal cod (Gadus morhua) from beach seine catches of 0-group. In: Flødevigen rapportserie no 1, 1992
(Flødevigen rapportserie, Research report, 1992)The validity of a beach seine 0-group index as a measure of year-class strength of cod in exposed areas along the Norwegian Skagerrak coast was tested. Fishing with trammel-nets was performed during November and December ... -
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 ... -
Recruitment of cod (Gadus morhua), whiting (Merlangius merlangus) and pollack (Pollachius pollachius) in the Risør area on the Norwegian Skagerrak coast 1945 to 1985. In: Flødevigen rapportserie no 1, 1990
(Flødevigen rapportserie, Research report, 1990)0-group gadoids and other fishes from the shallow water zone were sampled with a beach seine at 22 fixed localities in the Risør area at the Norwegian Skagerrak coast. A series of 41 years (1945 - 85) has been analysed. Cod, ... -
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 ... -
Sårbare fiskeressurser i Skagerrak
(Rapport fra Forskningsstasjonen Flødevigen;1993 nr 1, Working paper, 1993-04-23)This report describes distribution of economically important fish and shellfish and their eggs and larvae in Skagerrak and gives a short discussion on possible exposure to negative man made environmental conditions. -
Some aspects of the feeding ecology of myctophids in the waters off central east Africa. In: Flødevigen rapportserie no 1, 1988
(Flødevigen rapportserie, Research report, 1988)Analyses of the degree of filling and the state of digestion of four species (Diaphus watasei, Benthosema fibulatum, Myctophum brachygnatum and Diaphus garmani) revealed that all but D. watasei were cyclic feeders feeding ... -
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 ... -
A stock assessment of lobster (Homarus gamarus) on the Norwegian Skagerrak coast
(Flødevigen rapportserie, Research report, 1982)The lobster stock on the Norwegian Skagerrak coast has become gradually less abundant since early 1950'ies. This is shown by decreasing catch per unit of effort and decreasing numbers according to cohort analysis on ... -
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
(Flødevigen rapportserie, Conference object, 1984) -
Survival and growth of turbot (Scophthalmus maximus L.) in a land-situation mesocosm. In: Flødevigen rapportserie no 2, 1990
(Flødevigen rapportserie, Research report, 1990)A mesocosm study of turbot larvae was undertaken in a 2000 m^3 outdoor basin into which 15000 yolk sac larvae were released. Scarce food supply during first feeding gave high initial mortality and only 10% survived the ...